SYSTEM AND METHOD FOR COMPENSATING FAILURES CAUSED BY DEVICE INSTALLATION AND HEAT TRANSFER

专利摘要:
A thermal sensor system (805) includes a sensor (810) for measuring a temperature in a user environment (850) and providing a sensor signal (817) indicative of the temperature sensed by the device. The system (805) further includes a heat transfer entry (815) associated with the sensor (810). The heat transfer entry (815) provides heat transfer parameters (818) for compensating the temperature measured by the sensor (810) as a function of heat transfer between the sensor (810) and the user environment (850). The heat transfer parameters (818) are associated with predetermined heat transfer information for characterizing a transfer of heat energy between the sensor (810) and the user environment (850). Further, a method for compensating a temperature measurement of a sensor (810) in a user environment (850) as a function of heat transfer of the sensor (810) in a temperature measurement system (805).
公开号:AT12816U1
申请号:TGM245/2011U
申请日:2005-08-16
公开日:2012-12-15
发明作者:
申请人:Watlow Electric Mfg；
IPC主号:

专利说明:

Austrian Patent Office AT12816U1 2012-12-15
description
SYSTEM AND METHOD FOR COMPENSATING FAILURES CAUSED BY DEVICE INSTALLATION AND HEAT TRANSFER
FIELD OF THE INVENTION
[0001] The invention relates generally to temperature monitoring, and more particularly to systems and methods for compensating for heat transfer failure and other heat transfer related aspects of a temperature based system.
BACKGROUND
Many thermal devices generate a signal in response to a given environmental condition. For example, For example, a double thermocouple has an output voltage due to a temperature difference between one end and the other end of the thermal device. Double thermocouples are analog temperature sensors that utilize the thermoelectric properties of two dissimilar materials, typically metals, to produce an electromagnetic force (EMF) proportional to a temperature gradient across the inhomogeneous compound of the two materials. Conventional thermocouples used for temperature sensing include two metal wires with different thermoelectric properties, referred to as thermocouples, connected at one end to form a "hot junction", also called a "measurement transition". designated to form. The other ends of the wires are connected to measuring instruments such as a voltmeter to measure the EMF produced by the double thermocouple. The wires are connected to the instrument at a known reference temperature to provide a " reference junction " or "cold transition" to build.
Many thermal failures are associated with the use of double thermocouples and other such temperature sensors. For example, For each sensor, there are specific errors and application errors associated with the way the sensor is used in the user's application in the " field " is positioned or installed (installation error). Positioning and mounting errors are often a major source of temperature sensor errors in the user application. If e.g. If the sensor mounting depth is low or a temperature gradient exists near the tip of the sensor, a heat flow "Q" results, which significantly affects the sensor output. This error can easily reach several degrees or several tens of degrees and be the biggest mistake in a thermal system.
In general, these error classifications in temperature sensors relate to the heat transfer properties within the sensor and to the environment around the sensor. For example, For example, a shielded sensor that measures a thermal process has a heat flow from the process to the sensing element that includes a boundary layer heat flux from the process to the sensor shield, heat flow from the shield to the sensor element, and other heat flow paths from the shield to the cold end of the sensor. Each of the heat flow paths mentioned provides another source of potential thermal errors in the thermal measurement system if it is not properly considered or otherwise compensated by the measurement system.
A sensor adequately immersed in a process environment should have a negligible temperature difference between the sensor element and the process conditions. However, a sensor that is not adequately in contact with the process could have significant thermal defects. For example, For example, a surface of a hot plate may be surrounded by ambient air at 500 ° C so that air is at near room temperature just above the surface of the plate. A surface sensor would, under such conditions, have a very steep thermal gradient from the surface of the target to just above the sensor element (near ambient temperature), and thus there is likely to be a difference between the sensor element and the target. 1/40 Austrian Patent Office AT 12 816 Ul 2012-12-15
In addition, a probe placed on a surface would act as a heat sink and significantly cool the target, further increasing the measurement error.
Although some current approaches use calibration data to improve performance, and some systems can be compensated for by thermal analysis on a particular system, thermal environment, installation, application, and sensor specific errors continue to exist and adversely affect the accuracy of a thermal sensing system. Process variability and product quality.
There is therefore a need for improved compensation of such heat transfer paths in a dual thermocouple system and other temperature monitoring systems. The improved compensation should minimize static and dynamic system errors by reducing variations in sensor output due to heat transfer between the sensor and the thermal environment surrounding it, as well as due to the thermal installation error of the sensor in the user application. The improved compensation should also reduce variations due to sensor specific errors due to the design of the sensor.
SUMMARY
The following is a simplified brief description intended to provide a basic understanding of one or more aspects of the invention. This summary is not an exhaustive description and is not intended to identify essential or critical elements of the invention nor to outline its scope. The main purpose of the summary is merely to illustrate some aspects of the invention in a simplified form, as a prelude to the more detailed description given later.
One aspect of the invention includes a thermal sensor system that includes a sensor for measuring a temperature in a user environment and for providing a sensor signal indicative of the temperature sensed by the sensor. The system also includes a heat transfer entry associated with the sensor. The thermal entries provide heat transfer parameters to compensate for the temperature measured by the sensor as a function of heat transfer between the sensor and the user environment. The heat transfer parameters are associated with predetermined heat transfer information for characterizing a transfer of heat energy between the sensor and the user environment.
Another aspect of the invention includes a temperature measurement error compensation system having a temperature sensor for use in a sensor environment within a user application that generates a sensor signal. The system also includes a heat transfer entry associated with the sensor for providing a heat transfer characteristic between the sensor and the sensor environment within heat transfer parameters associated with the user application. The system further includes a communication interface for providing the heat transfer parameters to a temperature measurement system operatively connected to the communication interface. The temperature measuring system is configured to determine a compensated sensor signal in dependence on the provided heat transfer parameters.
In yet another aspect, the invention includes a measurement system for compensating for heat transfer between a thermal device and a user environment surrounding the thermal device within a user application. The system includes a thermal device that can be positioned in the user environment and that provides a thermal device signal. The system further includes a heat transfer entry associated with the thermal device for providing heat transfer parameters of a heat transfer function that at least partially describes the relationship between the temperature of the thermal device and the heat transfer between the thermal device and the user environment. The system further includes a temperature measurement compensation device for receiving the heat transfer parameters and generating a compensated measured temperature as a function of the heat transfer between the user environment and the thermal device.
In yet another aspect, the invention includes a method for compensating a temperature measurement of a thermal device in a user environment as a function of heat transfer of the thermal device in a temperature measurement system. The method includes entering heat transfer parameters stored by a heat transfer entry associated with thermal transfer characteristics of the thermal device. The method further includes measuring a signal of the thermal device during the temperature measurement and compensating the measured signal of the thermal device as a function of the heat transfer function.
Further aspects of the invention will become apparent from the following detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be more fully understood from the detailed description and the accompanying drawings.
Fig. 2 Fig. 4 Fig. 4 Fig. 5A. Fig. 5B Fig. 6A. Fig. 6B [0023 ] Fig. 7A Fig. 7B is a diagram showing a conventional double thermocouple device that can be used in a temperature monitoring system. Fig. 12 is an accompanying schematic symbol of the conventional double thermocouple of Fig. 1 and the sign of the EMF provided by the device; is a diagram of two exemplary thermal sensors and a hot plate, wherein a first sensor makes a point contact with the hot plate and a second sensor is positioned at a distance from the plate, the effect of a steep temperature gradient on the sensors and the thermal errors shows, which can result in a temperature measurement; Fig. 10 is a diagram of a sensor making line contact with a heat source, such as a hot plate; FIG. 12 is a diagram of a sensor in a user application with predominantly convective heat transfer in accordance with an embodiment of the invention; FIG. Fig. 5A is a one-dimensional thermal conductivity model of the sensor in the user application with predominantly convective heat transfer of Fig. 5A; FIG. 12 is a diagram of a sensor in a predominantly conductive heat transfer user application according to an embodiment of the invention; FIG. FIG. 6 is a one-dimensional thermal conductivity model of the sensor in the predominantly conductive heat transfer user application of FIG. 6A according to an embodiment of the invention; FIG. Figure 3 is a diagram of a sensor in a predominantly convective heat transfer user application, which also includes a radiative heat transfer component, according to an embodiment of the invention; FIG. 12 is a thermal conductivity model of the sensor in the convective and radiative heat transfer user application of FIG. 7A according to an embodiment of the invention; FIG. 3/40 Austrian Patent Office Fig. 8A Figs. 8B to 8C Fig. 9A Fig. 9B Fig. 10 Fig. 11 Fig. 12A to Figs Figure 12C is a diagram of an exemplary sensor system for providing predetermined informational parameters that may be used to determine the sources of heat transfer between a sensor and the sensor Sensor to compensate surrounding user environment according to an embodiment of the invention; 12 are diagrams of exemplary heat transfer compensation systems that may be used in conjunction with the sensor system of FIG. 8A to determine in a monitoring system according to an embodiment of the invention the sources of heat transfer between a sensor and the user environment surrounding the sensor, including sensor mounting and heat transfer within of the sensor, to compensate; FIG. 5 is a block diagram illustrating an exemplary heat transfer model for obtaining a heat transfer function and a heat transfer entry with respect to the sensor applied to the user environment and application in combination with sensor specific information as a function of transferred heat in the system of FIG Embodiment of the invention shows; FIG. 12 is a block diagram of an exemplary system for determining thermal contact resistance GC between the outer shield of the sensor and a target heat source using various user input parameters in the heat transfer model of the system of FIG. 8, according to one embodiment of the invention; FIG. 10 is a diagram illustrating an exemplary dual thermo-module heat transfer modeling system for processing user and sensor specific inputs and heat profile information to heat transfer parameters of a sensor stored as a heat transfer entry in a storage device according to some embodiments of the invention; FIG. FIG. 10 is a simplified diagram showing an exemplary temperature measurement and heat transfer compensation system for measuring and compensating the output of a dual thermocouple sensor system having a dual thermocouple and associated heat transfer entry according to an embodiment of the invention; FIG. 12 are diagrams of several exemplary dual thermocouple sensor systems showing various heat transfer entries for storing parameters associated with heat transfer of a temperature monitoring system according to an embodiment of the invention; FIG. 10 is a flowchart showing a method of compensating for heat transfer in a sensor measurement system according to various aspects of the invention; FIG. and is a computer window sequence of an exemplary user input computer program for polling the user for information about the specific sensor and environmental conditions in the user's sensor application to determine the heat transfer characteristics in a temperature measurement system according to an aspect of the invention.
Corresponding reference characters designate corresponding parts throughout the several views of the drawings. 4/40 Austrian Patent Office AT 12 816 Ul 2012-12-15
DETAILED DESCRIPTION
The following description is purely exemplary in nature and is not intended to limit the invention, its application or uses in any way.
One or more embodiments of the invention relate to a thermal compensation system for compensating for heat transfer in a thermal device measurement or control system. The compensation system uses predetermined and stored parameters associated with the thermal device to compensate for heat transfer within the measurement system, which is reflected in the output of the sensor. The heat transfer function may then be analyzed to determine parameters that may be referenced or stored directly by thermal transfer entries associated with the thermal device. The stored parameters are read by the metering or control system and used to reconstruct the heat transfer function of the thermal metering system. The heat transfer function is then used to compensate for the thermal device signal based on the heat transfer function to compensate for heat transfer paths in a thermal device and at the same time reduce heat transfer swirls within and around the thermal device, thereby minimizing static and dynamic system errors.
As mentioned above, there are many thermal failures associated with the application of thermal devices such as double thermocouples or other temperature sensors in a user application. There are errors specific to the particular thermal device and application errors associated with the way the thermal device is used in the user application, including errors related to the installation of the thermal device in the user application " field " refer (installation error). These thermal errors can lead to significant errors in the signal of a temperature measurement system in the user application. If e.g. the depth of insertion of a sensor is small and the sensor makes only a point contact and has only a low contact pressure, a loose fit or a poorly matched contact surface shape, or if a temperature gradient exists at the tip of the sensor, a heat flow "Q " which significantly influences the sensor signal. In this and similar situations, this error can be the biggest error in a thermal system. In other situations, the error may be relatively small, but still significantly affect the variability of the process.
In general, these thermal defects in thermal systems relate to the thermal heat transfer characteristics between the sensor element and the environment surrounding the thermal device, which typically includes a shield for protecting a sensor element. For example, For example, a shielded sensor that measures a thermal process has a heat flow between the process and the sensor element that can be modeled as a circuit of thermal conductors. The circuit of thermal conductors may correspond to: a boundary layer conductor from the sensor shield process, a conductive element from the shield to the sensor element, and further conductive elements along the shield to the cold end of the sensor. Each of the heat flow paths designated by one of the mentioned conductive elements provides a potential source of thermal errors in the thermal measurement system, unless each is adequately compensated by the measurement system.
In an intelligent temperature measurement system, it is desirable to develop and transmit as much information as possible and thereby generate knowledge in the system. One way to do this is to identify parameters that describe the thermal device or a measurement system and to communicate the information (preferably together with the thermal device) as a parameter to the measurement system in order to "smart" the thermal device. close. This system can then use this parameter information to generate knowledge-based algorithms. As an example, various heat transfer functions and thermal models of a sensor are presented in one process. The above examples show that measurement errors can be the result of heat flow in a thermal system. By using a thermal model, some of these errors can be calculated and corrected. A thermal model requires that the discussed thermal parameters are known. For example, In a node grid, the various thermal conductors are determined to provide a method for determining the temperature of the various nodes based on an energy balance across all nodes. In a temperature measurement system, the heat path from the process to the sensor element as well as any shunt heat transfer from the process to the outside environment, which is due to the presence of the sensor, would also have to be modeled as a heat conductor. Fortunately, the strength of the heat conductors for a particular sensor or family of sensors (e.g., thermal sensors) may be determined in advance and provided substantially (such as stored at the sensor) as well as calibration data as characteristic parameters of the sensor. The additional thermal information provided by the thermal modeling makes the sensor an intelligent sensor for correcting errors in the measurement in an intelligent measurement system.
A heat transfer compensation system may then be implemented by collecting thermal information specific to a thermal device user and environment thermal device user associated with thermal information specific to the thermal device, e.g. from the manufacturer of the thermal device. For example, For example, in a temperature sensor, the specified thermal information may include sensor positioning data including a mounting method or system, a mounting position relative to a heat source or an application to be measured, such as a heater, a sensor mounting depth, ambient temperature, sensor contact pressure, the shape of the target relative to the probe tip of the selected sensor, and be the expected operating temperature. The heat transfer model would then be analyzed to provide a heat transfer function of changing the output signal as a function of the thermal environment surrounding the thermal device and the user application for the thermal device, including installation or method of positioning the thermal device in a mechanical or chemical manufacturing system of the present invention User can include.
The heat transfer function may be stored or recorded in different ways, e.g. as a table of empirical data of the output signal as a function of the detected temperature, a mathematical function of the heat transfer as a function of the temperature, or other parameters such as adapted data coefficients of the mathematical heat transfer function. However, thermal device configurations in the thermal system of the invention include parameters related to the heat transfer characteristics of, for example, a manufacturer's specified part number sensor. These parameters, along with information for a given user application, allow use of the information in the application to compensate for temperature measurement errors due to heat transfer in the sensor system using heat transfer modeling.
In contrast to a conventional system, one or more embodiments of the invention described herein include the provision of heat transfer modeling parameters associated with a thermal device for correcting or compensating thermal errors in thermal devices due to heat transfer between the thermal device and its environment and around the thermal device. Thus, some embodiments of the invention may include one or more means for storing and communicating predetermined information to a thermal model used to determine the various heat transfer paths between the thermal device and the shield, the thermal device mount, the environment of the thermal device, and to model the application itself.
In one embodiment, the system includes a thermal device, such as a heater or sensing device. For example, can a thermal sensor system a 6/40 Austrian Patent Office AT12816U1 2012-12-15
A double thermocouple, a resistance temperature detector, a thermistor, a diode or a transistor, which is located in a sensor environment and is used in a user application. The thermal device or system may also include heat transfer entries associated with the thermal device for storing or referencing a set of heat transfer parameters of heat transfer between the sensor and the user environment in the user application.
The compensation system may be used in a heat transfer compensating device or a heat transfer compensating instrument (e.g., a computerized measuring instrument for temperature, pressure, flow, or chemical properties). Such a compensation device may be operatively connected to a thermal device or a thermal system and operable to utilize the parameters stored by the heat transfer entry. Heat transfer entries may be stored in any type of suitable medium, including an EPROM, an EEPROM, a bar code, an RFID tag, a virtual storage space in a network, a storage device, a computer readable medium, a computer hard drive, and a storage device is operable to communicate information about the heat transfer related to the sensor system. After reading the stored entries, the compensation device reconstructs the heat transfer function, which can then be used to compensate for the temperature measurement errors reflected in the output of the system due to the various heat transfer paths of the thermal device system.
Optionally, heat transfer modeling according to one aspect of the invention is performed based on thermal information input from an environment surrounding a specific thermal sensor. The thermal information may be stored in an electrically erasable Programmable Read-Only Memory (EEPROM) chip which is integral to the user's sensor. According to an exemplary application, the temperature sensor is connected to an electronic instrument that is capable of reading the stored information from the EEPROM and using the thermal parameters read out to calculate the heat transfer function for calculating a correction value as a function of the indicated temperature. This calculated correction value is then used to compensate or correct the displayed temperature with respect to heat transfer error modeled in the measurement system.
To appreciate one or more features of embodiments and implementations of the invention, various exemplary implementations of the heat transfer compensation systems, the thermal device, and sensor systems, a measurement system, and a heat transfer model will now be described and described with reference to the accompanying drawings. Although designs and implementations using dual thermocouples are shown and described in the examples and figures, in the context of embodiments of the invention various other thermal devices, such as heating elements and temperature measurement transducers such as RTDs, and thermistors are provided where the heat transfer failure can be compensated by the sensor output signal.
Fig. 1 shows a conventional double thermocouple device 100 as may be provided by a thermocouple manufacturer and used in a temperature monitoring system. Fig. 2 shows an accompanying switching symbol 200 of the sensor or the double thermocouple device 100 of Fig. 1. Most common double thermocouples are temperature measuring devices or sensors comprising two dissimilar metals joined together at an end called a hot junction. The two metals have a polarity with respect to each other, and one of them is called a positive leg and the other a negative leg. The two free ends, termed the cold end, provide a voltage (EMF) proportional to the temperature difference between the hot end and the cold end.
Referring back to Fig. 1, the conventional double thermocouple typically has a stainless steel shield 110 for protecting the hot junction which is potted therein (eg, with a ceramic or epoxy potting material) and a thermocouple junction 120 (eg, stainless steel) to protect the transition to a length of high temperature insulated conductive wire 130. The conductive wire 130 may also carry a length of heat shrink tubing 135 and a label 140 before terminating with a miniature male contact 145.
FIG. 3 shows a sensor system 300 and associated graph 330 showing the effect of a steep temperature gradient on two exemplary similar thermal sensors and the thermal errors that may occur in a temperature measurement. As discussed, the degree of immersion of a sensor into the process environment can greatly affect the thermal gradient across the sensor element surface of the sensor and the error of the indicated temperature. The system 300 includes an exemplary sensor A 310 having a single point contact 315 to a surface 318 of a heat source T 320, which in one embodiment may be a hot plate. In the example, the surface 318 of the heat source T 320 is at a temperature of 250 ° C in a room in which the room air temperature is 21 ° C, as shown in graph 330. The graph 330 illustrates the temperature versus distance from the heat source T 320. At a short distance from the surface 318, which has a temperature of 260 ° C, the ambient air temperature rapidly returns to near ambient temperature, such as through the temperature graph 330 shown.
Another exemplary sensor B 340 is located at a short distance "s " 350 from the surface 318 of the heat source T 320. Since the sensor A 310 has only point contact 315 to the heat source T 320 and a steep temperature gradient exists near the surface 318 of the heat source T 320, the sensor A 310 may lose some of the heat of measurement to the ambient air and eg show only 232 of the 260 ° C surface temperature. The sensor A 310 can therefore lose about 10% of the actual temperature of the target heat source T 320 under these conditions. The error between the actual temperature and the measured temperature at the tip of a sensor may provide some measure of the "peak sensitivity". represent the sensor. The sensor B 340 at a distance "s " 350 from the heat source T 320 detects at its tip the air temperature of about 32O, but can also lose about 10% of this temperature to the surrounding air, resulting in a measurement result well below 32Ό.
A sensor placed between the positions of the sensor A 310 and the sensor B 340 may have a light or very poor contact with the heat source T 320. Although the sensor A 310 is poorly immersed in the process measurement of the surface 318, the sensor B 340 is spaced from the surface 318 and therefore less immersed or equipped to measure the temperature of the surface 318. In addition, a probe placed on the surface 318 of the heat source T 320 would act like a wing of a heat sink and thereby locally cool the heat source T 320 and further contribute to the measurement error.
FIG. 4 shows a sensor system 400 having a sensor 410 which forms a line contact 415 with a surface 418 of a heat source T 420. The sensor 410 has a diameter "d". 430 and contacts the surface 418 of the heat source T 420 over a length of 10 diameters "10d". 440 of the sensor probe 410. In this mounting configuration of the sensor 410, the sensor 410 may provide an improvement in temperature measurement accuracy over the sensor A 310 of FIG. 3 and may cause a temperature error of e.g. about 1 - 2% of the actual temperature when measuring the heat source T 420 deliver. Thus, even in a more idealized installation situation, measurement errors can still be perceived as a result of the heat flow in a system. This heat flow may be due to the installation configuration, the user environment, the user application, or the specific sensor selected for the application.
Figures 5A, 5B, 6A, 6B, 7A and 7B show various thermal models in applications of thermal devices where the thermal device is a sensor convective , conductive and radiative heat transfer detected as predominant modes of heat transfer for the application.
FIG. 5A shows a temperature sensor immersed in a thermal process of a user application 500 with predominantly convective heat transfer. FIG. 5B shows a convective thermal conductivity model 510 of a sensor 520 in a user application 500 with predominantly convective heat transfer, as in FIG. 5A. The exemplary convective thermal conductivity model 510 may be modeled and represented as a series of thermal nodes connected by conductors.
In the convective user application 500 of FIG. 5A and the convective thermal conductivity model 510 of FIG. 5B, the exemplary double thermocouple sensor 520 has a sensing element 530 that is covered and protected by a shield 540. The sensor 520 is held or positioned by a bracket 550 for immersion in a free process stream 555. The sensor 520 includes a cold end 562 that is not submerged in the free process stream 555 and is at ambient temperature.
In the convective conductivity model 510, there are four nodes with associated identified temperatures. Ta560 is an ambient temperature at the cold end 562 of the sensor 520, TM 570 is a temperature at the sensing element 530, Tsb580 is a temperature of the sensor shield 540 at a process boundary, and T «, 590 is a process temperature of the free process stream 555. These thermal nodes (eg 560, 570, 580 and 590) are connected by heat transfer conductors. These conductors include a heat conductor Gs2 585 from the free process stream 555 to the shield 540, a heat conductor Gs1 575 from the shield 540 to the sensing element 530 and a heat conductor Ga 565 from the sensing element 530 to the cold end 562 of the sensor 520.
Fig. 6A shows a temperature sensor in a user application 600 with predominantly conductive heat transfer. Such a system is typical of contact sensors in which a sensor shield is mechanically held on a solid surface. In Fig. 6A, the round tip of a sensor is in contact with an erosion-processed receptacle such as a wellbore in the target body (heat source body) which is at a temperature TP 690. FIG. 6B shows a conductive thermal conductivity model 610 of the sensor in the predominantly conductive heat transfer user application 600 of FIG. 6A.
In the conductive user application 600 of FIG. 6A and the conductive thermal conductivity model 610 of FIG. 6B, an exemplary dual thermocouple sensor 620 has a sensing element 630 that is covered and protected by a shield 640. A tip 675 of the sensor 620 is held against an abraded receptacle 655 in a target 650 having an immersion depth lp 692 with a radial contact surface 652 and a line contact (ring) 654 on a surface of the sensor 620. In the conductive conductivity model 610, thermal nodes include: Ta 560 an ambient temperature at a cold end 632 of the sensor 620, TM 570 a temperature at the sensing element 630, Tsb 580 a temperature of the sensor shield 640 at the process boundary, and Tp 690 a process temperature of the target solid 650 thermal nodes (eg 560, 570, 580 and 690) are through heat transfer conductors, a thermal contact resistance Gc 685 between the outer shield 640 of the sensor 620 and the target solid 650 of the process, GS | 575 from the shield 640 to the temperature sensing element 630 and Ga 565 from the sensing element 630 to the cold end 632 of the sensor 620. The thermal contact resistance Gc 685 represents a parallel combination of the contact resistances of the radial surface contact 652 and the line contact 654 between the sensor 620 and the target solid 650.
Heat is transferred via the contact resistance Gc685 between the target solid 650 and the sensor shield 640. The heat then transfers from the sensor shield 640 to the sensing element 630 via the thermal conductor Gsi 575, then through the sensor 620 and the shield 640 to the surrounding via Ga 565. While Gc 685 is shown as a single conductor, Gc 685 may actually be multiple such conductors, including radiative and convective lead components, depending on the application (as discussed in connection with Fig. 9/40 Austrian Patent Office AT12816U1 2012-12-15 7A and 7B). Further, Gc 685 depends on the contact area that the sensor 620 forms with the target solid 650 and a force applied to maintain the contact.
The contact area is based on the geometry of the sensor 620 and the geometry of the machined seat 655 in the application target solid 650. Specifically, the contact area is based on the similarity or fit of the sensor 620 and the application geometry. In many user applications, a significant error is associated with a depth of immersion in the application and the tip sensitivity of the sensor 620. If e.g. an immersion depth lp 692 is small relative to a sensor diameter 694, increased thermal errors may result. This effect is called thermal shunting. While much of the thermal shunt error can be eliminated by compensation using characterization of device geometry and peak sensitivity, characterization of the application geometry and application temperature profile in accordance with embodiments of the invention eliminates or minimizes these errors.
Fig. 7A shows a temperature sensor in a predominantly convective heat transfer user application 700, which also has a radiative heat transfer component, e.g. a convective / radiative application. FIG. 7B shows a convective / radiative thermal conductivity model 710 of the sensor in the convective and radiative heat transfer user application 700 of FIG. 7A. For example, For example, an application may use a resistance heater heated furnace and use forced ventilation to transfer the heat to the furnace load. In this type of user application, the heating elements radiate heat to the sensor as defined by the heat transfer quotient Q, based on the equations: Q is a function of F, Α, ε, and (ΔΤ) 4; [1] or Q = f (F, A, £, AT); Where F is the visual factor, A is the surface of the sensor exposed to the radiation source, ε is the emittance, and ΔΤ is the differential between the source temperature and the shielding temperature. While sensor geometry is a feature of the device, the position and spacing of the sensor relative to the heating element and the exposed surface of the sensor are based on application characteristics that can be queried by the user when generating an improved thermal model.
In the convective / radiative user application 700 and the convective / radiative thermal model 710, an exemplary dual thermocouple sensor 720 includes the sensing element 530 that is covered and protected by the shield 540. The sensor 720 is held by a bracket 550 to immerse in the free process stream 555 and exposed to a radiation source 757. In the convective / radiative thermal conductivity model 710, the thermal nodes include: Ta 560 the ambient temperature at the cold end 562 of the sensor 720, TM 570 the temperature at the sensing element 530, Tsb 580 the temperature of the sensor shield 540 at the process boundary, T "590 the process temperature of the conductive Process (free current) 555, and Ts 795 a temperature of the radiation source 757. These thermal nodes (eg 560, 570, 580, 590 and 795) are connected to heat transfer conductors, a conductor Gs2 585 from the convective process 555 to the shield 540, a conductor Gs 792 from the radiation source 757 to the shield 540, a conductor Gsi 575 from the shield 540 to the temperature sensing element 530, and a conductor Ga 565 from the sensing element 530 to the cold end 562 of the sensor 720.
FIGS. 8A-8C are diagrams of an exemplary sensor system 805 of FIG. 8A that may be used in exemplary temperature measurement error compensation systems 806 and 807 of FIGS. 8B and 8C, respectively, in accordance with some embodiments of the invention. 10/40 Austrian Patent Office AT 12 816 Ul 2012-12-15
The sensor system 805 provides predetermined information in the form of heat transfer parameters stored as a heat transfer entry that can be utilized by the exemplary compensation systems 806 and 807 to compensate for measurement errors due to heat transfer in and around a sensor of a temperature monitoring system. Note that the compensation systems 806 and 807 are incorporated and described herein for a deeper understanding of the possible context and as an exemplary measurement and compensation system in which the sensor system according to embodiments of the invention may be used. It is anticipated that other systems may also use the heat transfer parameters for compensation, as may be required to control a heating and / or cooling system.
The sensor system 805 of FIG. 8A includes a sensor 810 and heat transfer indicia 815 associated with the sensor 810. The sensor system 805 has a sensor output or signal 817 for temperature measurements, e.g. for a thermal monitoring system. A heat transfer entry 815 includes distinguishing features, stored data, or a reference to data in a storage device that is capable of storing a set of sensor-specific heat transfer parameters 818 associated with heat transfer between the sensor 810 and a user environment 850 surrounding the sensor 810 User application are linked. For example, For example, entry 815 is associated with sensor 810 or a class of sensors 810, as will become clearer later. As indicated, the heat transfer entry 815 may include an entry storage system or entry storage device (not shown) associated with the specific user selected sensor (not shown). The entry storage system may e.g. an EPROM, an EEPROM, a bar code, an RFID tag, a virtual storage location in a network, a storage device, a computer readable medium, a hard disk, and other storage device operable to communicate information about the sensor. A reference to heat transfer parameter data may include a reference to a data store, a database reference, a network pointer, a sensor or file reference, a serial number, a model number, a batch number, or a reference number.
For example. For example, sensor heat transfer parameters 818 stored in the entry 815 may be used by the user or in a thermal compensation device or thermal compensation instrument of a temperature measurement system (such as 806, 807) along with additional application and environmental inputs to facilitate heat transfer between the sensor 810 and the sensor surrounding user environment 850. The manufacturer of the sensor 810 may provide a set of these parameters using a similar model of a functional relationship of the heat transfer characteristics of the sensor 810. These parameters associated with the heat transfer are then stored by the sensor manufacturer in the heat transfer entry 815.
A heat transfer functional relationship may be e.g. be represented as a heat transfer function, such as 1 / G = 1 / Ga + 1 / Gc + 1 / Gsi; [3] and Q '= G * AT [4] where Q' is the heating rate and G is the equivalent series conductor. In this way, the manufacturer is able to communicate predetermined heat transfer information from the sensor 810, which is later useful to the user as modeling inputs via sensor heat transfer parameters 818. In the exemplary implementation, the sensor manufacturer essentially provides e.g. Ladder parameters Ga and Gsi of the model, which together with user-supplied additional application and environment inputs provide the premises for further optional modeling of the Gc-ladder, as discussed above. With these inputs, an improved heat transfer model for a more accurate temperature measurement in the specific environment of the user can be obtained.
FIGS. 8B-8C illustrate exemplary temperature measurement error compensation systems 806 and 807, respectively, that may be used in conjunction with the sensor system 805 in accordance with some embodiments of the invention. The systems 806 and 807 may be used to compensate for the sources of heat transfer in and around the sensor 810 and the user environment in a monitoring system. The systems 806 and 807 receive a sensor temperature measurement signal 817 from the sensor 810, read an entry output signal 820 that includes sensor heat transfer parameters 818 stored by the heat transfer entry 815 and is used to compensate for temperature measurement errors with respect to the heat transfer sources and the sensor 810.
For example Figure 8B shows an exemplary temperature measurement error compensation system 806 for compensating for heat transfer in a sensor of a temperature monitoring system, e.g. can be used in a thermocouple based on a temperature measuring system. The system 806 includes a sensor system 805 having the sensor 810 located in a user environment 850 of a user application and the heat transfer entry 815 associated with the sensor 810. The system 806 further includes a heat transfer compensating device or a heat transfer compensation instrument 822 operable with the sensor system 805 may be connected to a sensor signal 817, eg measuring temperature, and reading sensor heat transfer parameters 818 stored in entry 815 and provided by sensor input output signal 820. It will be understood that sensor system 805 and heat transfer compensation instrument 822 may be separate components in some embodiments, as shown in FIG. 8B, and in other embodiments may be combined into a single physical or functional unit. For example, For example, the sensor system 805 and the heat transfer compensation instrument 822 may be components of an Active Structure Panel (ASP) or similar arrangement or package. In another embodiment, the sensor system 805 would be configured to be compatible with an interface, plug, or connector assembly to the heat transfer compensation instrument 822. This may be a specific interface or conform to a known standard such as that defined by a standards body such as the IEEE (e.g., IEEE P1451.4), it may be vendor-specific or based on a cooperation standard such as National Instruments cooperation.
The heat transfer compensation device 822 uses the sensor heat transfer parameters 818, optionally along with a user application and environment input 830, to construct a heat transfer model or a heat transfer function and to compensate the sensor signal 817. In a preferred optional embodiment, the user application and environment input 830 may be entered directly by a user of the heat transfer compensation device 822 as shown in FIG. 8B. In such an embodiment, one or more user application and environment inputs 830 may be entered and stored in a memory (not shown) of the heat transfer compensation device 822 for user selection and use and heat transfer compensation device 822. In another preferred optional embodiment, the user application and environment input 830 may be entered into a heat transfer entry 815 and stored and transmitted to the heat transfer compensation device 822. In some embodiments, a portion or subset of the user application and environment inputs 830 may be stored in a heat transfer entry 815, e.g. a part related to a general set or type of user application or environment. In such a case, another portion of the user application and environment inputs 830 may be entered directly into the heat transfer compensation device 822, including generally applicable data or application specific data supplementing the other data and providing a complete set of user application and environment inputs 830 for use by the heat transfer compensation device 822 can. After receiving the sensor heat transfer parameters and the optional user application and environment input 830, the heat transfer compensation device 822 then provides a temperature measurement error compensated signal 890 corresponding to the heat transfer profile of the sensor 810 as a function of temperature on the user application and environment inputs 830. The temperature measurement error compensated signal 890 may include other components, data or information and include a correction of the thermal error.
Fig. 8C shows e.g. an exemplary temperature measurement error compensation system 807 for compensating for heat transfer in the sensor 810 of a temperature monitoring system according to some embodiments of the invention that may be used in various sensor measurement systems, including a dual thermocouple based temperature measurement system. The system 807 of FIG. 8C includes the sensor system 805 with the sensor 810 located in a user environment 850 of a user application and the heat transfer entry 815 associated with the sensor 810. The system 807 further includes the heat transfer compensation device 822 coupled to the sensor system 805 sensor that senses the sensor signal 817 (eg, a measurement of the temperature), is operatively connected, and reads the sensor heat transfer parameter 818 stored by the heat transfer entry 815 and provided by a sensor entry output signal 820.
The heat transfer compensation device 822 of FIG. 8C uses sensor heat transfer parameters 818, optionally along with user application and environment inputs 830, to construct or reconstruct a heat transfer model or heat transfer function and to compensate the sensor signal 817 of the sensor 810. The device 822 then provides a temperature mismatch compensated signal 890 according to the heat transfer profile of the sensor 810 as a function of temperature based on the user application and environment inputs 830 and sensor specific inputs 915 provided by the manufacturer of the sensor 810.
The heat transfer compensation system 807 may further include a heat transfer model 835 for characterizing and modeling the heat transfer between the sensor system 805 and the user environment 850 and the application of a temperature measurement system surrounding the sensor system 805. Optionally, the heat transfer model 835 is operable to receive user application and environment inputs 830 and to generate a functional relationship or a heat transfer function 840 based on sensor heat transfer parameters 818 stored by the heat transfer entry 815. The functional relationship 840 may be e.g. be represented as the above-mentioned heat transfer functions [3] and [4]. However, this is only an exemplary model, various other models may be used and are considered to fall within the scope of embodiments of the invention.
The result of the heat transfer modeling input to the heat transfer model 835 may provide a heat transfer function 840 for the particular sensor type as a function of heat transfer (e.g., a function of temperature and heat transfer for a thermal sensor). Heat transfer parameters associated with the heat transfer function and the user-selected sensor are then used by the compensation device 822 to compensate for the errors in the measurement signal 817 and to provide the temperature measurement error compensated signal 890.
In this way, the heat transfer compensating device 822, which may be operatively connected to the sensor system 805, measures the sensor signal 817 (e.g., a temperature measurement) and reads a heat transfer function 840 representing parameters 818 stored by the heat transfer entry 815. The heat transfer compensation device 822 then uses various thermal parameters to reconstruct the heat transfer function and to compensate the signal 817 of the sensor 810. The device 822 then provides a temperature measurement error compensated signal 890 according to the heat transfer profile of the sensor 810 as a function of temperature based on the user application and environment inputs 830 and the sensor-specific inputs 13/40 915 provided by the manufacturer. 915. Austrian Patent Office AT12816U1 2012-12-15 [ 0077] Various elements of the temperature measurement error compensation systems 806 and 807 are best appreciated from the examples of the following figures. It should also be noted that in the context of various embodiments of the invention and the following examples, it is intended to interrogate heat transfer related data from the user rather than to generate such data. The models discussed below help provide the compensation parameters rather than the full thermal modeling of the thermal application.
For example FIG. 9A is a block diagram of an exemplary heat transfer model 900, similar to the model 835 of FIG. 8, according to an embodiment of the invention. The model 900 of FIG. 9A may be used to obtain, in the case of a thermal sensor, a heat transfer function and a heat transfer entry associated with a specific sensor as a function of temperature, user application, and environment surrounding a sensor. The model 900 includes a heat transfer modeler 905 that is operable to provide the user's environmental and application inputs 830 (eg, user-supplied information from a programmed list of questions or requests) and sensor-specific inputs 915 from the manufacturer (eg, a heat transfer profile from the manufacturer of a specific sensor) and to generate a heat transfer model (eg, Q '= G * AT) 835 operatively coupled to a heat transfer analyzer 920. The model 900 may also include empirical and / or predetermined data.
For example, the heat transfer analyzer 920 may use an algorithm or macro 930 in a computer program to analyze the heat transfer model 835 temporarily stored in a memory 925 to generate a heat transfer function 935. The analyzer 920 may also use empirical and / or predetermined data. The heat transfer function 935 is output from the analyzer 920, for example, as the heat transfer function 935 itself, as heat conductor parameter 940 (eg, Ga, Gsi) of the heat transfer function 935, as a set of heat transfer parameters, or a reference to the parameters 945. The output of the analyzer 920 becomes then stored as heat transfer entry 815 in an entry storage system or storage device (not shown) associated with the selected specific sensor (not shown). The entry storage system may include an EPROM, an EEPROM, a barcode, an RFID tag, a virtual storage space in a network, a storage device, a computer readable medium, a hard disk, and other such storage device operable to provide information about the sensor communicate.
Figure 9B shows an exemplary system for determining the thermal contact resistance Gc 685 between an outer shield of a sensor and a target heat source using various parameters entered by the user in the heat transfer model of the system of Figures 8A, 8B and 8C according to some embodiments of the invention.
In one embodiment, the thermal model includes three parameters to provide compensation for heat transfer in a measurement system. As indicated in connection with the thermal models of FIGS. 5-8, these parameters may be represented by the series heat transfer conductors: Ga 656, Gc 685, and Gsi 575 in the exemplary heat transfer function of Formula [4].
Among these parameters, Gs1 575 and Ga 565 and the geometry of the sensor are typically known at the time of manufacture as predetermined sensor-specific information and regardless of the application conditions. Further, Gc 685 may be calculated by providing a sensor user (eg, a customer or application engineer) with compensation specific to the sensor, as well as other supporting information, along with the user input to assist in defining and defining the sensor. AT12816U1 2012-12- 15
Modeling the user application to help. With these user-supplied inputs, an application-specific compensation of the sensor output or the sensor signal can be achieved.
For example, in Figure 9B, an exemplary system 960 analyzes various user application and environment inputs 830 in determining Gc 685 by the analyzer 970. User inputs 830 may be: the source temperature (T source), the ambient temperature (T environment). , the geometry of a sensor mounting hole, hole depth, hole surface machining, how closely the sensor fits, and any application specifics that affect the contact resistance between the sensor and the heat source part. If the temperature difference (T source-T ambient) is greater and if a sensor mounting hole is flat, the sensor environment is more sensitive to a thermal mounting error. With the sensor, large diameter, low resistance materials (materials with high thermal conductivity), and larger material cross-sections affect the thermal installation error. In addition, the placement of the sensor element with respect to the sensor tip and contact resistances between the outer shell of the sensor package and the internal sensor element also affect the sensor thermal mounting error and thus the value determined for Gc 685.
Fig. 10 shows an exemplary double thermocouple heat transfer modeling system 1000 for processing sensor specific inputs and thermal profile information to heat transfer parameters of a sensor according to an embodiment of the invention. The parameters may be stored as a heat transfer entry in a storage device according to some embodiments of the invention as described in FIGS. 8 to 9. Optionally, the system supports 1000 application and environment inputs from a user of the sensor.
In the exemplary modeling system 1000 of FIG. 10, a specific sensor type or family of sensors having similar thermal profile properties is fabricated. A sensor (eg, a dual thermocouple) 1005 may be thermally profiled in an experimental setup, such as a thermal profiler 1010. The modeling system 1000 includes a computer 1012 or other analyzer that receives the sensor-specific inputs 915 associated with the type of sensor 1005. Optionally, system 1000 supports receiving user application and environment inputs 830 from a sensor user along with sensor-specific inputs 915. Based on an analysis of user application and environment inputs 830, sensor-specific inputs 915 and thermal profile 1018 are generated and stored by profiler 1010 Computer 1012 a heat transfer model and a heat transfer function. Fig. 14 will later illustrate such a user input or information gathering methodology using a specialized computer modeling program. Alternatively, the thermal model may be partially constructed with the predetermined sensor-specific inputs 915 and then completed by a user upon application installation by providing the application and / or environment inputs 830.
The heat transfer function generated by the computer 1012 of FIG. 10 may be further processed to include heat transfer parameters 940 or a reference to parameter 945 of the heat transfer function, a reference to an external location where the parameters are stored, or a location where a part the heat transfer function is stored. The heat transfer parameters 940 or the reference to parameter 945 are then programmed by the heat transfer entry 815 (eg, an EEPROM, EPROM, storage device, storage space in a network, RFID tag or bar code) using, for example, an EEPROM programmer or burner 1035 stored in a different way.
In the thermal profiler 1010, e.g. a double thermocouple sensor 1005 may be mounted on a test stand 1040 together with a known reference standard such as a reference dual thermocouple 1045 for reading the true temperature in a ceramic insulation sleeve 1050 within a heat test chamber 1055. The sensor and the reference sensor 1045 may be coupled via plugs and receptacles 1060 to a measuring device 1065 (for example, DMM or ADC) to the computer 1012. Der Sensor 15/40 Österreichisches Patentamt AT12816U1 2012-12-15 The computer 1012, along with, for example, a software macro or specialized program, as well as the memory of the computer are used to generate and provide the thermal profile of the sensor 1005 with respect to temperature and various environmental characteristics associated with the heat transfer function of the thermal sensor 1005 to save. The heat test chamber 1055 may also receive a temperature control 1070 from the computer 1012 to precisely control the temperature in the heat test chamber 1055. In other embodiments, a sensor may be profiled in a shallow dipping or other mounting arrangement that represents a user application of the sensor.
Once the heat transfer information (eg, via parameters or a mathematical function) has been communicated to the heat transfer entry associated with the user's sensor, the information may be used to compensate for the output of a temperature measurement device.
For example, FIG. 11 shows an exemplary temperature measurement error compensation system 1100 for measuring and compensating the signal of a dual thermocouple sensor system having a dual thermocouple and associated heat transfer entry according to an embodiment of the invention. A sensor system 1110 includes a dual thermocouple sensor 810 and an associated heat transfer entry 815 (eg, an EEPROM memory) housed together in a connector housing 1122. Sensor 810 and entry 815 are linked via specific parameters associated with or representing the heat transfer characteristics of sensor 810 and stored by entry 815. With these parameters, a user with a particular environment in a particular user application can model the heat transfer of the sensor 810 for use in the user environment. For example, sensor 810 provides an analog signal 817, while the input output signal 820 provided by entry 815, such as EEPROM memory, provides parameter 818. Both are supplied to a functionally coupled double thermocouple heat transfer compensation device 822. The sensor signal 817 is operatively coupled to an analog-to-digital converter ADC 1140 of the compensation device 822 to be converted to a digital signal, whereas against the entry output signal 820 of the entry 815 via a digital input port 1145 in serial or parallel input format to the compensation device 822 is entered.
In an exemplary embodiment, a Cold Junction Compensation (CJC) sensor 1147, which may be disposed in connector housing 1122, may be provided in compensation device 822 or other device or as a standalone component as shown. A CJC sensor signal 1120 of the CJC sensor 1147 is operatively coupled to a cold junction compensation circuit 1148, and is provided by the ADC 1140 to a digital value for transfer to the microprocessor 1150 for cold junction compensation of the sensor signal 1120 based on the cold junction temperature measurement.
The exemplary double thermocouple heat transfer compensating device 822 includes a microprocessor 1150 that reads (for example, when the compensation device 822 is turned on) the parameters from the entry 815 and temperature readings and stores them in a local memory 1155. The microprocessor 1150 and the memory 1155, which are synchronized by a clock 1157, analyze the temperature measurements for temperature and heat transfer to compensate the sensor signal 817 according to the stored heat transfer parameters of the memory 1155 to provide a heat transfer compensated signal 890 to a communication interface 1165 of FIG To provide compensation device 822.
For example, the sensor portion of the sensor 810 may be placed in a 1000 ° C oven, while the connector housing 1122 is generally outside the oven at ambient temperature, and thus the entry 815 and thermally protect the heat transfer parameters stored therein.
Optionally, the system 1100 supports receipt of application and environment inputs 830 and / or a heat transfer function provided by the user and received in the compensation system 822 to assist the user in modeling the heat transfer from the sensor 810 to the user environment.
FIGS. 12A-12C illustrate various exemplary sensor systems (eg, dual thermocouple sensor systems) that utilize various types of heat transfer entries 815 for storing parameters related to heat transfer within a temperature sensing system according to some embodiments of the invention. For example, FIG. 12A illustrates a sensor system 1200 having an exemplary EEPROM heat transfer entry 1210 that may be embedded in a connector housing 1220 of the sensor system 1200. In the present example, a dual thermocouple 1230 in the connector housing 1220 may be operatively connected to a set of dual thermocouple connector pins 1235a and 1235b, while the EEPROM 1210 may require additional EEPROM connector pins 1237 for power and memory access control, for example. An advantage of this type of heat transfer entry is the direct accessibility of an attached sensor monitoring system to the EEPROM heat transfer entry 1210 for immediate remote access to the stored parameters associated with the double thermal element 1230.
FIG. 12B illustrates another sensor system 1240 having another exemplary heat transfer entry 815 that includes a radio identification (RFID) tag 1250 embedded in the connector housing 1220. Again, according to some embodiments of the invention, the RFID heat transfer insert 1250 stores the parameters associated with heat transfer in a temperature measurement system. An advantage of this type of heat transfer entry is that no additional connector pins are needed, that the stored parameters can be read from some distance from the sensor and without direct contact with the sensor, and that they may be stored by the sensor monitoring system at short distances for immediate remote access to the sensor Parameters can be read.
Figure 12C illustrates yet another exemplary sensor system 1260 having an exemplary barcode heat transfer entry 1270, for example, on a label 1270a on connector housing 1220, on a shrink label 1270b, or as part of another label, such as an identification or serial number label 1270c is appropriate. Again, in accordance with some embodiments of the invention, the bar code heat transfer entry 1270 stores the parameters related to heat transfer within a temperature measurement system. An advantage of this type of heat transfer entry is that no additional connector pins are needed, that it is inexpensive, and that the stored parameters can be scanned with a conventional bar code reader and read to access the stored parameters without direct contact with the sensor. Of course, other types of bar code systems or data matrices may also be used as the heat transfer entry.
Another implementation of the invention provides a method of compensating for heat transfer in a temperature sensing system as illustrated and described herein, as well as in other types of sensor measurement systems having heat transfer errors.
In one embodiment, the method corrects or compensates for thermal sources of error that can occur in sensor measurement systems due to heat transfer between a thermal device such as a sensor and the environment surrounding the sensor in a user application, thereby minimizing variations in the output of the system. An implementation of the invention also adapts to specific types of thermal device, environment, and application variability by providing user input for the specific type of sensor, the environment of use, the installation conditions, and the temperature conditions of a user's device. / Customer application as well as corrections thereof due to thermal errors.
Some embodiments of the method are based on the expectation that the heat transfer between a thermal device and the environment surrounding the thermal device in a thermal system can be thermally modeled and used as a basis for obtaining a heat transfer function or parameters representing the function to compensate for the output or signal from the sensor due to thermal errors in the measuring system. For example, in a temperature sensor, the thermal error for one or more test sensors may be modeled and characterized as a function of, for example, temperature and heat transfer between the sensor and its environment. To compensate for the thermal error, the heat transfer function would then be the change in output as a function of temperature for a particular sensor, environment, application, and temperature condition. The heat transfer function can be recorded or stored in a variety of formats, for example, as data tables and parameters indicative of the mathematical heat transfer as a function of temperature, in various media or devices, for example, EEPROM, RFID tags, and bar code labels with a heat transfer entry. A sensor system is formed when the heat transfer function or parameters stored in the heat transfer entry are linked to a sensor of the same type used in the environment of use, installation configuration, and temperature conditions as specified by the user.
In one implementation of the method, when a thermal device is used and monitored (for example, in the heat transfer compensation and measurement system of FIG. 10), the heat transfer function (eg, a set of parameters) may be used to determine the thermal error in FIG the measurements, signals and / or outputs of the thermal device to compensate.
Turning now to FIG. 13, an exemplary method 1300 for a temperature measurement error compensation system used to compensate for thermal failure in the system according to various aspects of the invention is illustrated. For example, such a compensation system may be similar to the system of FIG. 11 or the compensation systems of FIGS. 8B and 8C. The exemplary method 1300 compensates for the error in the output of a thermal device in a temperature measurement system (806, 807, and 1100). The system 1300 uses heat transfer parameters from predetermined information stored by the heat transfer entry associated with the thermal transfer properties of the thermal device. A thermal model uses the parameters to transform the heat transfer characteristics of the thermal device into a heat transfer function. A temperature measurement of the thermal device is obtained and the output is compensated according to the thermal model heat transfer function.
While the method 1300 and other methods are illustrated and described herein as a series of acts or events, it should be understood that embodiments of the invention are not limited to the illustrated order of such acts or events. For example, in accordance with one embodiment of the invention, some actions may occur in a different order and / or concurrently with other acts or events other than those illustrated and described herein. In addition, all illustrated operations or steps are not necessarily necessary to implement a methodology according to some embodiments of the invention. Further, according to some embodiments of the invention, the method 1300 may be implemented in conjunction with the compensation systems, control systems, elements, and devices illustrated and described herein as well as in conjunction with other systems, elements, and devices not shown.
The exemplary heat transfer compensation method of FIG. 13 begins with step 1305. Initially, in step 1310, system parameters of the thermal device are given in the form of thermal transfer entry 815 of the heat transfer characteristics of the thermal transfer device Device 810 stored predetermined information, for example, from the manufacturer of the thermal device 810, entered into the thermal compensation device 822. In step 1320, the heat transfer parameters (eg, signal 820 containing parameters 818) are thermally modeled and analyzed to obtain a heat transfer function of the output change as a function of temperature for a specified thermal device 810. The function or parameters representing the heat transfer function may be e.g. stored in a local memory 1155 of the heat transfer compensating device 822.
In step 1330, the temperature sensor signal 817 is measured. In step 1340, the sensor signal 817 is compensated using the heat transfer function based on the heat transfer characteristics of the sensor. Finally, in step 1350, a compensated temperature signal 890 is obtained which includes a correction of the thermal error in the signal 817 of the sensor 810.
Thereafter, the heat transfer compensation method 1300 ends with step 1390. An exemplary method according to the invention thus thermally models the heat transfer from a sensor from parameters associated with the heat transfer function stored in a heat transfer entry associated with the sensor, based on the heat transfer properties of a specific sensor type. The method also compensates for the thermal error reflected in the output of the sensor using the parameters stored in the heat transfer entry integral to the sensor.
Optionally, other implementations of the invention include the receipt of application and environment inputs 830 or a user-supplied function of heat transfer. For example, these inputs may be included in the compensation system 822 to assist the user in modeling the heat transfer of a specific sensor used in the user's environment.
Figure 14 shows an exemplary windowing sequence of a thermal modeling computer program 1400 for querying thermal information from the user of a thermal device / customer. The thermal modeling program 1400 may also generate a thermal model based on the user information and a knowledge base embedded in the program of the types of thermal devices available from the manufacturer of the thermal device.
The exemplary thermal modeling program 1400 requests user information such as the type of thermal device (eg, RTD, double thermocouple, thermistor), thermal device model (eg, K-type double thermocouple model # K-123456), and heat detection mode (e.g. Example detection of radiative, conductive or convective type). Detection may also be subdivided into primary, secondary, and tertiary detection modes to account for applications that have more than one type of detection, for example primary = conductive, secondary = radiative, as illustrated in FIGS. 7A and 7B. The modeling program 1400 may also include information such as a mounting configuration (eg, front-mounted with single point contact such as 310 in FIG. 3 or radial line contact as in FIG. 4) and a degree of engagement (eg, less than 1 diameter or greater than 1 diameter ) Interrogate. Note that the window (5) may be programmed to only interrogate this information from the user when in the window (4) an installation configuration is selected that has a " engagement depth " has, such as "frontal, surface contact", "frontal and radial, surface contact " or "radial, line contact," etc. The modeling program may also query the intimacy of a contact or a contact force (eg, loose, tight, or press-fit of the thermal device into the appropriate thermal source of the application), or alternatively, the contact force may be quantified.
Other features that may be queried by a modeling program 1400 include a contact surface finish, contact surface extent or length, 19/40

权利要求:
Claims (36)
[1]
Austrian Patent Office AT12816U1 2012-12-15 a contact distance from the temperature sensing element as well as a sensitivity of the thermal device or tip. Further, any other environmental conditions of the user application of the thermal device useful for determining the heat transfer properties between the thermal device and the thermal environment surrounding the thermal device in the measurement system may be included in the thermal model according to one aspect of the invention. After the user has provided such information (eg, in connection with an interactive website), the appropriate heat transfer compensation data may be downloaded to the compensation device or instrumentation 822. Alternatively, a thermal model may be used in the instrumentation and used to complete the compensation model provided by the entries associated with the thermal device. While various exemplary dual thermocouple sensing devices and methods of thermal compensation in a conductive sensing mode have been used to describe the thermal transfer properties of the exemplary thermal device and the thermal environment surrounding the thermal device in the thermal modeling program and the temperature compensation system any type of thermal device is thermally modeled and is contemplated in a context of the invention. In presenting aspects of the invention or embodiments thereof, the articles are intended to be a / an and / or that means that there is one or more of the elements. The terms "include", "include" and "exhibit " should not be conclusive and mean that there may be other elements in addition to the listed elements. In view of the above, it will be appreciated that various aspects of the invention are achieved and other advantageous results achieved. As various changes could be made to the above exemplary constructions and methods without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative, but not limiting. It is understood that the steps described herein should not be construed as requiring their implementation in the particular order discussed or illustrated. It is understood that additional or alternative steps may be used. Claims 1. A thermal sensor system (805) comprising: a sensor (810) for measuring a temperature in a user environment (850) that provides a sensor signal (817) indicative of the temperature sensed by the sensor (810), comprising: a sensor (810); 810) for providing a set of sensor-specific heat transfer parameters (818) associated with the transfer of heat energy between the sensor (810) and a user environment (850) surrounding the sensor (810), characterized by a compensation system (810). 806, 807) comprising a heat transfer compensation device (822) configured to select user application and environment inputs (830) from a user of a plurality of predetermined user application and environment inputs (830); wherein the compensation system (806, 807) is configured such that, based on the user application and environment inputs (830) by the user, a sensor input output signal (820) representing the sensor-specific heat is obtained. 12-15, to compensate for the temperature measured by the sensor (810) as a function of heat transfer between the sensor (810) and the user environment (850).
[2]
The system (805) of claim 1, wherein the heat transfer parameters (818) are stored by the heat transfer entry (815) and / or are referenced by the heat transfer entry (815).
[3]
The system (805) of claim 1, further comprising: a heat transfer model (835) associated with the sensor (835) for generating heat compensation information for compensating the temperature measured by the sensor (810) as indicated by the sensor signal (817) Function of the heat transfer parameters (818).
[4]
The system (805) of claim 3, wherein the heat transfer model (835) defines a thermal relationship (840) between the temperature measured by the sensor (810) and a heat transfer property of the user environment (850), the thermal relationship (840) at least partially is defined by user information.
[5]
The system (805) of claim 4, wherein the user information comprises information received from a selected one of the group consisting of a list, a menu in a computer program (1400), a computer readable medium, and an online internet program.
[6]
The system (805) of claim 3, wherein the heat transfer model (835) defines a heat transfer relationship (840) of a conductive thermal relationship, and / or a convective thermal relationship and / or a radiative thermal relationship.
[7]
The system (805) of claim 3, wherein the heat transfer model (835) defines a heat transfer relationship (840) of a conductive thermal model, wherein the conductive thermal model comprises a heat transfer conductor Ga (565) from a sensing element to the sensor exterior environment and / or a heat transfer conductor Gsi (8 575) from a shield (540) to the sensing element and / or a heat transfer conductor (Gc) of the thermal contact resistance (685).
[8]
The system (805) of claim 3, wherein the heat transfer model (835) defines a heat transfer relationship (840) of a convective thermal model, wherein the convective thermal model comprises a heat transfer conductor Ga (565) from the sensing element to the sensor exterior environment and / or a heat transfer conductor Gsi ( 575) from a shield (540) to the sensing element and / or a heat transfer conductor GS2 (585) from the process to the shield.
[9]
The system (805) of claim 3, wherein the heat transfer model (835) defines a heat transfer relationship (840) of a radiative thermal model, wherein the radiative thermal model comprises a heat transfer conductor Ga (565) from the sensing element to the sensor environment and / or a heat transfer conductor Gs1 (575 ) from a shield (540) to the sensing element and / or a heat transfer conductor Gs2 (585) from the process to the shield and / or a heat transfer conductor Gs (792) from the radiative source to the shield.
[10]
The system (805) of claim 3, wherein the heat transfer model (835) comprises a network of heat transfer conductors representing heat transfer between the sensor (810) and at least one type of heat transfer fluid selected from the group consisting of convective heat transfer, conductive heat transfer, and radiative heat transfer is selected.
[11]
The system (805) of claim 1, further comprising: a heat transfer compensating device (822) for receiving the sensor signal (817) and the heat transfer parameters (818) from the heat transfer entry (815), the heat transfer compensating device (822) measuring a compensated measured 21 / 40 Austrian Patent Office AT12816U1 2012-12-15 Temperature generated as a function of the heat transfer model (835).
[12]
The system (805) of claim 1, further comprising: a heat transfer compensating device (822) for receiving the heat transfer parameters (818) from the heat transfer entry (815) and the sensor signal (817), the heat transfer compensation device (822) measuring a compensated measured temperature Function of a heat transfer property of the user environment (850) generated.
[13]
The system (805) of claim 12, wherein the heat transfer compensating device (822) comprises: an input module for receiving the sensor signal (817) from the sensor (810) and the heat transfer parameters (818) from that associated with the sensor (810) Heat transfer entry (815); a measurement module for receiving the sensor signal (817) from the sensor (810) and generating measurement data as a function of the received sensor signal (817); a processor module for determining the compensated measured temperature as a function of the measurement data and the heat transfer parameter (818) associated with the sensor (810); a memory for storing the measurement data and the heat transfer parameters (818); and a communication module for generating a compensated sensor temperature signal indicative of the compensated measured temperature.
[14]
The system (805) of claim 1, wherein the sensor (810) comprises a thermocouple (520).
[15]
The system (805) of claim 1, wherein the sensor (810) comprises a resistance temperature detector and / or a thermistor and / or a diode and / or a transistor.
[16]
The system (805) of claim 1, wherein the heat transfer entry (815) is associated with an entry storage system selected from the group consisting of an EPROM, an EEPROM, a barcode, an RFID tag (1250), a virtual storage space in a network, a storage device, a computer readable medium, a computer hard drive, and a storage device operable to communicate information from the sensor (810).
[17]
The system (805) of claim 1, wherein the heat transfer entry (815) provides the heat transfer parameters (818) for compensating the sensor signal (817) to provide a heat transfer compensated sensed temperature.
[18]
The system (805) of claim 1, wherein the heat transfer parameters (818) are associated with predetermined information provided by a manufacturer of the sensor (810).
[19]
The system (805) of claim 1, further comprising: a communication interface (1165) for providing the heat transfer parameters (818) to a temperature sensing system operatively coupled to the communication interface (1165), the thermal sensor system configured to provide a compensated Sensor signal as a function of the heat transfer parameters (818) to determine.
[20]
The system (805) of claim 3, wherein the heat transfer model (835) comprises: a user input for providing the heat transfer model information (835) about the sensor environment and the user application, which information includes a sensor environment input and / or a user application input; a thermal profile input associated with the sensor environment to provide a sensor heat transfer model (835) based on information associated with the sensor (810), the information including a thermal profile measurement and / or a referenced thermal profile measurement of the sensor (8) 810); and a heat transfer algorithm (930) for analyzing the sensor environment and / or user application inputs and analyzing the thermal profile input, the heat transfer algorithm (930) providing a heat transfer function (840), and wherein the heat transfer function (840) represents a thermal model analysis (835) based on the sensor environment input and / or the user application input and the thermal profile input.
[21]
The system (805) of claim 20, wherein the heat transfer function (840) comprises: a function describing the relationship between the measured temperature and the heat transfer between the sensor (810) and the sensor environment surrounding the sensor (810); and a function that describes the relationship between the measured temperature and heat transfer associated with a manufacturer-defined installation configuration of the sensor (810) and the sensor environment.
[22]
The system (805) of claim 20, wherein the heat transfer function (840) describes a heat transfer relationship (840) of a network of heat transfer conductors, the network of heat transfer conductors comprising at least one conductor selected from the group consisting of: a sensing element Sensor environment heat transfer conductor Ga (565) indicating a thermal resistance between a sensing element of the sensor (810) and a sensor environment; a shielding element heat transfer conductor Gsi (575) indicating thermal resistance between the sensing element (530; 630) of the sensor (810) and a shielding inner boundary of the sensor (810); a process shield heat transfer conductor GS2 (585) indicating a thermal resistance between an outer shield boundary of the sensor (810) and a convective process of the sensor environment; a thermal contact resistance heat transfer conductor Gc (685) indicating a thermal contact resistance between the outer shield boundary of the sensor (810) and the sensor environment conductive process; and a radiative source shielding heat transfer conductor Gs (792) indicative of a thermal resistance between the outer shield boundary of the sensor (810) and the sensor environment radiative process.
[23]
The system (805) of claim 1, wherein at least one of the heat transfer parameters (818) associated with the heat transfer function (840) is a function of predetermined information selected from the group consisting of sensor environment, user application, sensor manufacturer data, and sensor holder manufacturer data.
[24]
24. A method for compensating a temperature measurement of a thermal device in a user environment as a function of heat transfer of the thermal device in a temperature measurement system, wherein a heat transfer entry associated with the sensor is 815 provides a series of sensor-specific heat transfer parameters (818) associated with heat transfer between the sensor (810) and a user environment (850) surrounding the sensor (810), characterized by providing a compensation system (806, FIG. 807), comprising a thermal compensation device (822) configured to select user application and environment inputs (830) from a user of a plurality of predetermined user application and environment inputs (830); Retrieving by the compensation system (806, 807) based on the user application and environment inputs (830) by the user, a sensor entry output signal (820) representing the sensor specific heat transfer parameters (818) for compensating the sensor measured temperature in response to heat transfer between the sensor Sensor (810) and the user environment (850).
[25]
25. The method of claim 24, further comprising: inputting thermal device information associated with the output of the thermal device (810) as a function of heat transfer based on a heat transfer characteristic is; Modeling the heat transfer characteristic to produce the heat transfer function (840) including heat transfer parameters (818); and storing heat transfer parameters (818) in a heat transfer entry (815) associated with the thermal device (810).
[26]
The method of claim 24, wherein the heat transfer parameters (818) associated with the heat transfer function (840) are at least matched to a mathematical data coefficient and / or a statistically generated parameter.
[27]
27. The method of claim 24, wherein the heat transfer parameters (818) are a two-dimensional matrix of heat transfer data representative of heat transfer between the thermal device (810) and the user environment (850).
[28]
The method of claim 24, wherein the heat transfer parameters (818) are adjusted mathematical data coefficients associated with at least one mathematical function representative of one or more segments of the heat transfer function (840).
[29]
29. The method of claim 24, wherein the thermal device (810) comprises a thermocouple.
[30]
30. The method of claim 24, wherein the thermal device (810) is selected from the group consisting of a resistance temperature detector, a thermistor, a diode and a transistor.
[31]
31. The method of claim 24, further comprising: inputting thermal device information associated with the output of the thermal device as a function of heat transfer based on a heat transfer characteristic; - modeling the heat transfer property to produce the heat transfer function (840); and - referencing the heat transfer parameters (818) in the heat transfer entry (815).
[32]
32. The method of claim 31, wherein modeling the heat transfer property comprises a conductive thermal model (610) and / or convective thermal model and / or a radiative thermal model.
[33]
33. The method of claim 24, further comprising the step of thermally modeling the heat transfer function (840), wherein the thermal modeling comprises: - analyzing the user application, environmental inputs (830), and mounting characteristics of a thermal device manufacturer (810) and deriving the Heat transfer function (840) as a function of a relationship of temperature and heat transfer property; and - storing the heat transfer parameters (818) associated with the heat transfer function (840).
[34]
34. The method of claim 24, further comprising: - storing the input heat transfer parameters (818) in a heat transfer entry (815).
[35]
35. The method of claim 34, wherein the heat transfer entry (815) is associated with an entry storage system selected from the group consisting of an EPROM, an EEPROM, a barcode, an RFID tag (1250), a virtual storage space in a network a storage device, a computer readable medium, a computer hard disk, and a storage device operable to communicate information about the heat transfer with respect to the thermal device system. 24/40 Austrian Patent Office AT 12 816 Ul 2012-12-15
[36]
36. The method of claim 34, further comprising: generating the thermal transfer entry associated with the thermal device, wherein the generation includes: entering information related to the user environment and / or a user application; - inputting thermal device information associated with the output of the thermal device (810) as a function of a heat transfer characteristic; - modeling the heat transfer between the thermal device (810) and the user environment (850) to determine the heat transfer function (840); and - storing the heat transfer parameters (818) in the heat transfer entry (815) associated with the thermal device (810). For this 15 sheets drawings 25/40

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法律状态:
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