• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A sensor apparatus for measuring transpiration of a plant specimen comprises a circuit board device, a first humidity sensor arranged on the circuit board device, a second humidity sensor arranged on the circuit board device and a first chamber bounding structure for bearing against the plant specimen, wherein the first chamber bounding structure encloses the first humidity sensor in such a manner that, when the chamber bounding structure bears against the plant specimen, the first humidity sensor is arranged in a closed, first air chamber bounded by the plant specimen and the first chamber bounding structure. The circuit board device or the first chamber bounding structure has a first ventilation opening, which connects the first air chamber fluidically with the environment. The sensor apparatus further comprises a second chamber bounding structure, which together with the circuit board device forms a closed, second air chamber, in which the second humidity sensor is received, with the circuit board device or the second chamber bounding structure having a second ventilation opening, which connects the second air chamber fluidically with the environment, and a fastening device for fastening the plant specimen to the first chamber bounding structure.
    公开号:ES2881855A2
    申请号:ES202190063
    申请日:2020-04-17
    公开日:2021-11-30
    发明作者:Juergen Class；Christian Ohl；Matthias Boecker
    申请人:Robert Bosch GmbH；
    IPC主号:
    专利说明:

    [0002] SENSOR DEVICE FOR MEASURING THE TRANSPIRATION OF
    [0004] State of the art
    [0006] Against the background of high water consumption in agriculture due to irrigation measures, solutions are being sought to save water. One possibility to save water is to water the plants exclusively according to your needs. For this, it is important to know the need for water or the irrigation status of a plant.
    [0007] One possibility of determining the irrigation status of a plant is to measure the transpiration of the plant, for example, on a leaf. Through perspiration and gutting, approximately 97 to 99.5% of the water absorbed by the roots of a plant is re-emitted by the plant. Perspiration is controlled by small pores, which are typically found on the lower sides of the leaves and are called stomata. The transpiration or a time course of the transpiration (transpiration rate) of the plant depends, therefore, on the water balance of the plant and, therefore, can serve as a measure of the irrigation status.
    [0008] A sensor device for measuring perspiration is described, for example, in DE3032833C.
    [0010] Disclosure of the invention
    [0012] The present invention relates to a sensor device with the characteristics of claim 1.
    [0013] According to one aspect of the invention, a sensor device is provided for measuring the perspiration of a plant sample. The sensor device comprises a printed circuit board equipment, a first humidity sensor arranged and contacted in the printed circuit board equipment to detect a first humidity of the air in the area of the plant sample and a second humidity sensor arranged and contacted on the printed circuit board equipment to detect the humidity of the ambient air. Furthermore, the sensor device has a first chamber delimiting structure for contact with the plant sample, the first chamber delimiting structure protruding from chamber of the printed circuit board equipment framing the first humidity sensor in such a way that, when the chamber boundary structure is in contact with the plant sample, the first humidity sensor is arranged in a first enclosed air chamber or at least partially closed, delimited by the plant sample and the first chamber delimiting structure. The printed circuit board equipment or the first chamber boundary structure has a first ventilation opening that communicates the first air chamber in a fluidly conductive manner with the environment to allow diffusion into the environment of the water emitted by the plant sample. by perspiration and avoid saturation with water of the air located in the first air chamber. The sensor device also has a second chamber delimiting structure which, together with the printed circuit board equipment, forms a second enclosed or at least partially closed air chamber, in which the second humidity sensor is housed, presenting the printed circuit board equipment or the second chamber boundary structure a second ventilation opening that communicates the second air chamber in a fluidly conductive manner with the environment, so that an air humidity can be detected in the second air chamber of the environment as reference air humidity. Furthermore, the sensor device has a fixing kit for fixing the plant sample to the first chamber delimiting structure.
    [0014] An idea on which the invention is based is to arrange in separate chambers isolated from each other two humidity sensors to detect the humidity of the air on a support plate, a first humidity sensor being arranged in an open cavity that is enclosed or closed by the plant sample to form a first chamber, and thus detects the air humidity in the first chamber, which changes as a consequence of the transpiration of the plant sample. To make possible the diffusion of the water emitted by the plant sample to the environment and to avoid saturation with water of the air located in the first air chamber, the first chamber is communicated with the environment through an opening. A second humidity sensor is arranged in a second chamber which is in communication with the environment through a ventilation opening, and detects the humidity of the ambient air as a reference value. The cameras are respectively defined by camera bounding structures. The boundary structure defining the first chamber is implemented as a frame, for example in the form of a ring circumferentially enclosing the first humidity sensor and defining a contact opening that can be covered by the plant sample. In this way, the chamber boundary structure can be applied, for example, to a lower side of the sheet, where stomata are typically located.
    [0015] One of the advantages of the sensor device is that by fixing both humidity sensors to a printed circuit board equipment in fluidically separated chambers a compact structure of the sensor device results. Since the first air chamber, in which the first humidity sensor is arranged, is formed by the plant sample and the bounding structure applied therein, and the ambient humidity in the second air chamber, which is separated from the first air chamber is detected by the second humidity sensor, measurement values that are not influenced by each other can be determined respectively. In this way, a difference determined from the measured humidities can be used with improved reliability as a measure of the transpiration of the plant sample.
    [0016] Another advantage is that by arranging the humidity sensors in chambers defined by the chamber boundary structures the risk of damage to the sensors is reduced, which improves the suitability of the sensor device for continuous use. Furthermore, the sensor device is simple in structure and can be made with few components, making it robust and inexpensive.
    [0017] According to an embodiment of the sensor device, it is provided that the first humidity sensor is arranged on a first surface of the printed circuit board equipment and the second humidity sensor is arranged on a second surface of the printed circuit board equipment , oriented opposite to the first surface, the PCB kit being attached to a sensor housing and oriented with the second surface facing the sensor housing, and the second chamber boundary structure being formed by a recess sensor housing. By arranging the humidity sensors on opposite surfaces of the printed circuit board equipment, an even more compact and therefore lighter structure of the sensor device is realized. The sensor housing has a plate or block-shaped base section, on the surface of which a cavity is provided, which forms the second air chamber. The printed circuit board device is arranged in the base section such that the second humidity sensor is positioned in the cavity of the base section of the sensor housing. In this way, the mechanical protection is improved, especially of the second humidity sensor and the nameplate equipment. printed circuit in general. It can be made, for example, of a synthetic material.
    [0018] According to another embodiment, provision is made for the second ventilation opening to be formed by a through opening of the sensor housing, which opens into the recess in the sensor housing. In this way, a simple possibility of air exchange between the second air chamber and the environment is achieved.
    [0019] According to another embodiment, it is provided that the first ventilation opening is formed by a plate passage opening extending between the first and second surfaces of the printed circuit board equipment, the sensor housing having a housing opening communicated in a fluidly conductive way with the plate passage opening and communicated with the environment. In this way, a continuous ventilation channel is made between the first air chamber and the environment.
    [0020] According to another embodiment, it is provided that the first chamber delimiting structure is realized at least partially by a projection of the sensor housing. For example, provision may be made for the sensor housing to have a frame section projecting from the base section and surrounding the printed circuit board equipment arranged on the base section and projecting therefrom. An area of the frame section, located opposite the base section, is then provided for contact with the plant sample. In this way, a particularly light and robust sensor device is provided.
    [0021] According to another embodiment, it is provided that the clamping device has a first clamping piece coupled to the printed circuit board kit and a second clamping piece that is prestressed with respect to the first clamping piece and arranged opposite the first. camera bounding section. For prestressing, for example a spring can be used. Optionally, the first clamping piece is made in one piece with or by the sensor housing. In this case, for example, a coupling section formed in the base section can be provided, to which the second clamping piece is pivotally connected. By realizing the clamping kit with clamping pieces a simple possibility of handling the clamping or clamping of the plant specimen between the first chamber boundary structure and the second clamping piece is provided. Optionally, the second clamping piece is formed of a material transparent to light, so that, advantageously, the shading of the sample is reduced. plant by clamping piece.
    [0022] According to another embodiment, it is provided that the first chamber delimiting structure is formed at least partially of a magnetic or magnetizable material, the fixing device having a first magnetic piece for magnetic coupling to the magnetic or magnetizable material of the first frame structure. camera boundary. Therefore, the plant sample can be clamped between the chamber boundary structure and the first magnetic part, since the magnetic part and the chamber boundary structure attract each other. For example, the first magnetic piece can be an annular magnet, the shape of which is made corresponding to the shape of the first chamber boundary structure. In this way, the area of the plant sample that is covered by the magnetic piece is advantageously reduced, so that the plant sample can continue to photosynthesize and is not impaired by the sensor device.
    [0023] According to another embodiment, it is provided that the first chamber delimiting structure is formed by a second magnetic piece attached to the printed circuit board equipment. Accordingly, a frame of a magnetic or magnetizable material is attached to the printed circuit board equipment which forms the first chamber boundary structure.
    [0024] According to another embodiment, it is provided that the fixing device is formed by a fixing tape which is attached to the printed circuit board equipment and which has an adhesive layer for adhesion to the plant sample. To do this, the printed circuit board kit is glued directly onto the plant sample as a dressing. In this way, a particularly simple structure of the sensor device is realized and the risk of damage to the plant sample by the sensor device is further reduced.
    [0025] According to another embodiment, it is provided that the first chamber boundary structure has a contact section made of an elastically deformable material, especially a silicone material, for contact with the plant sample. For example, a layer of an elastically deformable rubber-like material may be provided on one surface of the second magnetic piece, located opposite the printed circuit board equipment. The contact section can also be produced in the region of the frame section of the sensor housing, which is located opposite the base section. Due to the elastically deformable, rubber-like material, the contact section is further reduced plus the risk of damage to the plant sample by the sensor device.
    [0026] According to another embodiment, the sensor device has a radiation sensor, arranged on the printed circuit board equipment outside the first and second chamber boundary sections, to detect incident radiation. In this way, it can be advantageously detected to which radiation conditions, for example by solar irradiation, the plant sample is exposed. In this way, a measure of the watering status of the plant that can be derived from the transpiration of the plant sample can be indicated even more precisely.
    [0027] According to another embodiment, provision is made for the first and second ventilation openings to be respectively covered by a gas-permeable membrane. In particular, a common membrane can cover both ventilation openings, or provision can be made for each ventilation opening to have its own membrane respectively. For example, the through opening provided in the sensor housing, which opens into the second air chamber, and the housing opening can be respectively covered by a membrane attached to the sensor housing to prevent the ingress of dirt or water from the sensor housing. environment in the respective air chamber. This further improves the suitability of the sensor device for continuous outdoor use. Optionally, the membrane may have a variable permeability to vary a diffusion rate or a flow rate through the first vent or from the first air chamber. This can be done, for example, using electroactive polymers or other materials capable of changing the porosity or permeability of the membrane in reaction to an electrical voltage.
    [0028] According to another embodiment, the first humidity sensor and / or the second humidity sensor can be embodied as a combined sensor unit, designed to detect humidity and temperature. The design as a combined sensor unit achieves a space-saving structure of the sensor device, and furthermore the estimation of temperature influences on perspiration is facilitated.
    [0029] According to another embodiment, the sensor device has a mechanical flow limiting device, by means of which the cross-sectional area of the first ventilation opening can be varied. For example, it may be provided that the housing opening of the sensor housing is provided with an adjustable diaphragm, by means of which the cross-sectional area of the housing opening can be varied to vary a diffusion rate or a rate of diffusion. flow through casing opening. It is also possible to provide the printed circuit board equipment or the chamber boundary structure with a diaphragm or other flow limiting device, depending on where and how the first vent is made. In general, a mechanical flow limiting device can be provided, by means of which the cross-sectional area of the ventilation opening, such as the diaphragm, a slide, a valve or the like, can be varied.
    [0030] In the following, the invention is explained with reference to the figures of the drawings. Among the figures, they show:
    [0031] FIG. 1 a schematic sectional view of a sensor device according to an embodiment of the invention in a state in which the sensor device is attached to a plant sample;
    [0032] FIG. 2 is a schematic sectional view of a sensor device according to another embodiment of the invention in a state in which the sensor device is attached to a plant sample;
    [0033] FIG. 3 is a schematic sectional view of a sensor device according to another embodiment of the invention in a state in which the sensor device is attached to a plant sample;
    [0034] FIG. 4 is a schematic sectional view of a sensor device according to another embodiment of the invention in a state in which the sensor device is attached to a plant sample;
    [0035] FIG. 5 is a schematic view of a flow limiting device of a sensor device according to another embodiment of the invention; Y
    [0036] FIG. 6 is a schematic representation of measurement results determined with a sensor device according to an embodiment of the present invention.
    [0037] In the figures, the same reference signs designate identical or identically functional components, unless otherwise indicated.
    [0038] Figure 1 shows by way of example a sensor device 1 for measuring the perspiration of a plant sample P. The sensor device 1 represented by way of example in Figure 1 presents a printed circuit board device 2, a first humidity sensor 3A, a second humidity sensor 3B, a fixture 7, a sensor housing 8 and an optional membrane 10.
    [0039] The printed circuit board equipment 2 has at least one printed circuit board as a carrier substrate for fixing and contacting electrical or electronic components on a first surface 2a and / or on a second surface 2b located opposite it. The printed circuit board equipment 2 can have, for example, a support plate made of a material transparent to visible light, on which electrical contact structures are made, such as conductive tracks. The printed circuit board equipment 2 can furthermore have a data interface (not shown) which is designed for wired or wireless data transmission, for example in the form of a Bluetooth interface, WIFI interface or the like.
    [0040] The first and second humidity sensors 3A, 3B are designed for detecting a moisture content of the air, especially for detecting a relative humidity. The humidity sensors 3A, 3B can be designed, for example, as capacitive sensors, in particular as combined humidity and temperature sensors, which are also designed for temperature detection. As shown by way of example in FIG. 1, provision can be made for the first humidity sensor 3A to be arranged on a first surface 2a of the printed circuit board device 2 and for the second humidity sensor 3B to be arranged on a second surface 2b, oriented opposite to the first surface 2a, of the printed circuit board equipment 2. But it is also possible to arrange both humidity sensors 3A, 3B on the first surface 2a of the printed circuit board equipment 2, such as represented by way of example in FIG. 4 and will be explained further below. The humidity sensors 3A, 3B are respectively contacted in the printed circuit board equipment 2, so that they can be supplied with electrical voltage and in turn provide sensor signals representing a respective humidity content at the data interface of the device. printed circuit board equipment 2.
    [0041] The optional sensor housing 8 of the sensor device 1 shown by way of example in FIG. 1 has a block-shaped base section 80 and a frame section 81 protruding from a first surface 80a of the base section 80. The frame section 81 defines or at least partially delimits a receiving area of the first surface 80a of the base section 80. As can also be seen in figure 1, the base section 80 can have a cavity or a recess 82 made on the first surface 80a, which in FIG. 1 has, for example, a rectangular cross section. The base section 80 also has a through opening 83 which opens into the cavity 82 and which can extend, for example, between a base of the cavity 82 and a second surface 80b, oriented opposite to the first surface 80a, in such a way that the section base 80. The sensor housing 8 can furthermore have an additional housing opening 84 which can extend in particular between the first and second surfaces 80a, 80b of the base section 80, as shown by way of example in FIG. 1 .
    [0042] As shown in FIG. 1, the printed circuit board device 2 can be attached to the sensor housing 8. As shown by way of example in FIG. 1, the printed circuit board device 2 can be specially arranged in the receiving area, defined by the frame section 81, of the base section 80, the second surface 2b of the PCB equipment 2 being oriented towards the first surface 80a of the base section 80. Generally, the second surface 2b of the printed circuit board equipment 2 faces the sensor housing 8. Furthermore, the second humidity sensor 3B is positioned on the second surface 2b of the printed circuit board equipment 2 in such a way that it is arranged in the cavity 82 of the sensor housing 8. The recess 82 thus forms a second chamber boundary structure 4B which, together with the PCB equipment 2, forms a second air chamber. e 5B enclosed or at least partially closed, in which the second humidity sensor 3B is housed. The passage opening 83 forms a second ventilation opening 6B that communicates the second air chamber 5B in a fluid conductive manner with the environment U. Alternatively, the second ventilation opening 6B could also be made in the printed circuit board equipment 2 Therefore, the second humidity sensor 3B can detect the humidity of the ambient air in the second air chamber 5B.
    [0043] The fixing device 7 shown by way of example in FIG. 1 has a first magnetic piece 73, a second magnetic piece 74 and an optional contact section 42. The first and second magnetic parts 73, 74 advantageously have a circumferential configuration corresponding to each other and can be embodied, for example, as annular parts, as represented by way of example and schematically in FIG. 1. Generally, the first and second magnetic pieces 73, 74 are made as frame pieces. The first and / or second magnetic piece 73, 74 are formed from a magnetic or magnetizable material. For example, the first magnetic piece 73 may be formed of a magnetic material and the second magnetic piece 74 of a magnetizable material, so that the magnetic pieces 73, 74 attract each other.
    [0044] As shown in figure 1, the second magnetic piece 74 is fixed to the first surface 2a of the printed circuit board equipment 2, being for example glued thereto. The second magnetic piece 74 defines a cavity by its frame-like configuration. The second magnetic piece 74 is positioned on the printed circuit board equipment 2 such that it surrounds or frames the first humidity sensor 3A or that the first humidity sensor 3A is arranged in the cavity defined by the magnetic piece 74. By Thus, the second magnetic piece 74 at least partially forms a first chamber boundary structure 4A that protrudes relative to the printed circuit board equipment 2 and frames the first humidity sensor 3A.
    [0045] The optional contact section 42 is formed of an elastically deformable, rubber-like material, such as a silicone material. As shown by way of example in FIG. 1, the contact section 42 may be arranged or fixed, for example glued or vulcanized, on one surface, facing away from the printed circuit board equipment 2, of the second magnetic piece 74.
    [0046] As can be seen in Figure 1, for the measurement of perspiration, the plant sample P is clamped between the first magnetic piece 73 and the second magnetic piece 74 or the contact section 42. The second magnetic piece 74 o the second magnetic piece 74 and the printed circuit board equipment 2 therefore form, together with the plant sample P, a first enclosed or at least partially closed air chamber 5A, in which the first humidity sensor 3A is arranged .
    [0047] The latter can therefore detect an air humidity in the first air chamber 5A, which varies as a function of the transpiration of the plant sample P. The second magnetic piece 74 or the second magnetic piece 74 and the contact section 42 therefore form both a first chamber delimitation structure 4A for contact with the plant sample P, the first chamber delimitation structure 4A protruding with respect to the printed circuit board equipment 2 framing the first humidity sensor 3A in such a way that when the chamber delimiting structure 4A is in contact with the plant sample P, the first humidity sensor 3A is arranged in a closed first air chamber 5A, delimited by the plant sample P and the first chamber delimiting structure 4A . As can also be seen in Figure 1, the printed circuit board equipment 2 has a board passage opening 20 that extends between the first and second surfaces. 2a, 2b. This can be arranged in particular flush with the housing opening 84, as shown by way of example in FIG. 1. Generally, the housing opening 84 is in fluid conductive communication with the plate passage opening 20, thereby so that the printed circuit board equipment 2 has a first ventilation opening 6A formed by the plate passage opening 20, which communicates the first air chamber 5A in a fluidly conductive manner with the environment U. Basically, it is also possible making the first ventilation opening 6A by means of a through opening in the second magnetic piece 74 or generally by means of a through opening in the first chamber delimiting structure 4A.
    [0048] For adjusting or varying a flow cross section of the first ventilation opening 6A, a mechanical flow limiting device 90 can be provided, for example in the form of a diaphragm, as represented by way of example and schematically. in Figure 5. The flow limiting equipment 90 may be arranged, for example, in the base section 80 of the sensor housing 8, such that the cross-sectional area of the housing opening 84 can be varied. by means of flow limiting equipment 90. In FIG. 5, such an arrangement is shown by way of example. The flow limiting device 90 realized as a diaphragm has several blades 91 which are guided in a direction transverse to the longitudinal axis of the housing opening 84, for example along a curved path, so that, to vary the cross section , they can be moved in and out of the housing opening 84. Of course, other configurations of the flow limiting device 90 are also possible, for example as a simple slide.
    [0049] To counteract the death of the plant sample P in the area of the magnetic pieces 73, 74, these can be formed, at least partially, of a material transparent to visible light. For example, a surface of the magnetic pieces 73, 74, facing the plant sample P, can be respectively formed of a transparent synthetic material, such as polymethylmethacrylate (PMMA).
    [0050] The optional membrane 10 is composed of a porous, gas-permeable material, such as Teflon or polytetrafluoroethylene (PTFE). As is further illustrated by way of example in FIG. 1, the membrane 10 can be specially fixed to the sensor housing 8 or the second surface 80b of the base section 80 and preferably covers both the through opening 83 and the through opening. housing 84.
    [0051] Therefore, the membrane 10 covers the first and second ventilation openings 6A, 6B. In this way, dirt or water from the environment is prevented from entering the air chambers 5A, 5B. In figure 1 it is shown by way of example that a single membrane 10 covers the first and second ventilation openings 6A, 6B. Obviously, it is also possible that each of the ventilation openings 6A, 6B is covered by a separate membrane respectively.
    [0052] FIG. 2 shows another sensor device 1. This differs from the sensor device 1 shown by way of example in FIG. 1, in particular in that a radiation sensor 9 is provided. The radiation sensor 9 serves to detect incident radiation. , for example, solar irradiation. As shown by way of example in FIG. 2, the radiation sensor 9 can be arranged and contacted especially on the first surface 2a of the printed circuit board equipment 2, such that it can provide sensor signals at the interface of data (not shown). In figure 2 it is shown by way of example that the radiation sensor 9 is arranged, directly adjacent to the frame section 81 of the housing 8, in a marginal area of the printed circuit board equipment 2. Generally, it is Provided that the radiation sensor is arranged on the printed circuit board equipment 2 outside the first and second chamber boundary sections 4A, 4B. Similarly, additional sensors may also be provided for the detection of thermodynamic quantities or other environmental conditions influencing perspiration, such as CO 2 sensors or anemometers.
    [0053] Figure 3 shows by way of example another sensor device 1 that differs from those represented in Figures 1 and 2 especially by the configuration of the fixing device 7 and the embodiment of the first chamber delimiting structure 4A.
    [0054] The optional contact section 42 is fixed, for example, glued or vulcanized, to the frame section 81. In the example shown in figure 3, the frame section 81 has an interruption (not shown), by which it is made a junction section of the printed circuit board equipment 2, which joins a central zone to a marginal zone. Correspondingly, also the printed circuit board 2 has an interruption 21 through which the frame section 81 passes. Similar to FIG. 2, the sensor device 1 has the optional radiation sensor 9 which It is arranged in the marginal zone of the printed circuit board equipment 2. As shown schematically in Fig. 3, the first chamber boundary structure 4A is thus formed by the frame section 81 of the sensor housing 8 and the optional contact section 42. Therefore, the first chamber boundary structure 4A is at least partially formed by a protrusion 81 of the sensor housing 8.
    [0055] In FIG. 3, instead of the magnetic parts 73, 74, a first clamping part 71 and a second clamping part 72 are provided which are tensioned against each other or towards each other. The first clamping piece 71 is formed by the sensor housing 8 or is made in one piece with it. Therefore, the first clamping piece is coupled to the printed circuit board equipment 2. As shown by way of example in FIG. 3, the second clamping piece 72 can be supported on the first clamping piece 71 in particular rotatable about an axis of rotation 75. The second clamp 72 extends opposite or along the first surface 2a of the printed circuit board 2. Optionally, on a surface 72a of the second clamp 72, facing the printed circuit board equipment 2, an additional contact section 43 of an elastically deformable material, similar to rubber, such as a silicone material, may be provided which has a shape corresponding to the structure of frame 81. As is
    [0056] represented schematically in FIG. 3, the clamping device 7 has a pretensioning device 76, for example in the form of a spring that pretenses the clamping pieces 71, 72 in such a way that in the area of the printed circuit board device 2, a clamping force is generated which acts from the second clamping piece 72 in the direction of the first clamping part 71. The clamping parts 71, 72 or at least one of the clamping parts 71, 72 are preferably made of a material transparent to visible light to reduce shading of the plant specimen P. Alternatively or in addition to this, provision can also be made for the second clamping piece 72 and / or the first clamping piece 71 to be perforated, that is that is, with a multiplicity of recesses (not shown) to further reduce shading by the clamping pieces 71, 72. If the clamping pieces 71, 72 are not made of a transparent material, in one of the clamping parts clamp 71, 72 an additional fiber optic conductor (not shown) may optionally be incorporated, so that the optional radiation sensor 9 can detect the radiation conditions in the environment U.
    [0057] As represented by way of example in FIG. 3, the sample of Plant P can be clamped between the first chamber boundary structure 4A, formed by the frame section 81 of the sensor housing 8 and the optional contact section 42, and the second clamping piece 72 or the clamping section. contact 43 of the second clamping piece 72. The frame section 81 protrudes relative to the printed circuit board equipment 2, as shown in Figure 3, and frames the first humidity sensor 3A in such a way that, when the Chamber delimiting structure 4A is in contact with the plant sample P, the first humidity sensor 3A is arranged in a closed first air chamber 5A, delimited by the plant sample P and the first chamber delimiting structure 4A.
    [0058] As an alternative to the sensor kits 1 shown in Figures 1 to 3, it is also possible to make the sensor housing 8 as represented in Figures 1 or 3 and place a magnetic piece on the frame section 81 of the housing sensor 8 or at least make the frame section 81 of the sensor housing 8 from a magnetic or magnetizable material. The fixing of the plant samples P to the chamber boundary structure 4A formed at least partially by the frame section 81, can then be carried out by means of the second magnetic piece 73 configured correspondingly to the frame section 81. Therefore In general, provision may be made for the first chamber boundary structure 4A to be at least partially formed of a magnetic or magnetizable material, and for the fixing device 7 to have a first magnetic piece 73 for magnetic coupling to the magnetic or magnetizable material. of the first chamber delimitation structure 4A.
    [0059] Figure 4 shows another sensor device 1 with a printed circuit board kit 2, a first and a second humidity sensor 3A, 3B and a clamping device 7. The printed circuit board kit 2 and the humidity sensors 3A, 3B can be made as described above. As shown by way of example in Figure 4, the first and second humidity sensors 3A, 3B are both arranged and contacted on the first surface 2a of the printed circuit board equipment 2. As schematically represented in Figure 4 , the sensor device 1 has a cap or a dome 11 that is fixed to the first surface 2a of the printed circuit board equipment 2 and that arches over the second humidity sensor 3B, in such a way that it is enclosed between the PCB equipment 2 and cap 11. Cap 11 thus forms the second chamber boundary structure 4B which, together with the printed circuit board equipment 2, it forms a second enclosed or at least partially closed air chamber 5B, in which the second humidity sensor 3B is housed.
    [0060] As further shown in Fig. 4, optionally, a frame 12 is provided which is fixed to the first surface 2a of the printed circuit board kit 2 and frames the first humidity sensor 3A. Frame 12 may, for example, be located directly downstream of cap 11, as schematically represented in Figure 4.
    [0061] As shown by way of example in FIG. 4, in the printed circuit board equipment 2 a first opening is provided which extends between the first and second surfaces 2a, 2b and opens into the second air chamber 5B and therefore, it forms the second ventilation opening 6B. Furthermore, in the printed circuit board equipment 2 a second opening is provided which extends between the first and second surfaces 2a, 2b and which is arranged within the frame 12 thus forming the first ventilation opening 6A.
    [0062] The fixing device 7 is realized in FIG. 4 by way of example as a kind of adhesive tape and has in particular a fixing tape 75 which is attached to the printed circuit board equipment 2 and which has an adhesive layer 75a for the adhesion to the plant sample P. As shown by way of example, the fixing tape 75 may be fixed or glued to the second surface 2b of the printed circuit board 2, with the fixing tape 75 forming laterally protruding tabs of the printed circuit board equipment 2 and that can be glued to the plant sample P through the adhesive layer 75a, as shown by way of example in figure 4. As can also be seen in figure 4 , the optional frame 12 is in contact with the plant sample P, so that it forms a first chamber delimiting structure 4A that frames the first humidity sensor 3A in such a way that, when the delimiting structure ation of chamber 4A is in contact with the plant sample P, the first humidity sensor 3A is arranged in a first air chamber 5A enclosed or at least partially closed by the plant sample P and the first chamber delimiting structure 4A . Basically frame 12 can also be omitted. In this case, the fixing tape 75 forms a first chamber boundary structure 4A which frames the first humidity sensor 3A in such a way that, when the chamber boundary structure 4A is in contact with the plant sample P, the first humidity sensor 3A is arranged in a first closed air chamber 5A, bounded by the plan sample P and the first chamber boundary structure 4A, as can be seen in Figure 4.
    [0063] Even if no membrane 10 is shown in FIG. 4, it can of course be provided that the first and second ventilation openings 6A, 6B are respectively covered by a membrane 10.
    [0064] By the structure of the sensor device 1 represented by way of example in Figures 1 to 4, in the first air chamber 5A defined by the first chamber delimiting structure 4A, an air humidity in the vicinity of the sample can be measured of plant P, for example, on the underside of a leaf. In the second separate air chamber, the air humidity of the ambient air can be measured.
    [0065] Figure 6 shows, by way of example, measurement results determined on a plant sample P with a sensor device 1 according to the above description. In the upper diagram D1, relative humidity is applied to the vertical axis H1 and time is applied along the longitudinal axis T. In the lower diagram D2, along the vertical axis H2 is applied the water content in the soil in which the plant is growing, the plant sample of which is being examined.
    [0066] The line L1 in the upper diagram D1 reproduces the first humidity of the air in the first air chamber 5A, detected by the first humidity sensor 3A. The line L2 in the upper diagram D1 represents the second humidity of the air, detected by the second humidity sensor 3B, in the second air chamber 5B, that is, the ambient humidity. Line L3 in the upper diagram D1 represents a difference between the first and second recorded air humidity. In the upper diagram, first time intervals T1 and second time intervals T2 are further designated, there being no light radiation in the first time intervals T1 and the plant sample being exposed to light radiation in the second time intervals T2 . Line L4 in the lower diagram D2 shows a water content in the soil.
    [0067] As can be seen in the upper diagram D1, during the day, the first air humidity in the first air chamber 5A initially increases strongly in the second time periods T2, indicating a transpiration of the plant sample P. During the second time periods T2, the first and the second humidity of the air are almost equal. As a result of a comparison between the upper diagram D1 and the lower diagram D2, the less water is present in the soil, the faster the first moisture falls back from the air. This means that the less water is available to the plant, the lower the transpiration of the plant. Thus, through the transpiration of the plant sample P, which can be detected by means of the sensor device 1, the irrigation status of the plant can be deduced. By detecting the humidity of the ambient air by the second humidity sensor 3B and, if necessary, detecting the irradiation by the radiation sensor 9, it can be determined whether the transpiration of the plant changes due to a supply of changing water or due to external influences. For example, the perspiration of the plant sample P decreases with increasing humidity of the ambient air and increases with increasing light irradiation.
    [0068] Although the present invention has been explained above by way of example with the aid of exemplary embodiments, it is not restricted to these, but can be modified in multiple ways. In particular, combinations of the above embodiments are also possible.
    权利要求:
    Claims (14)
    [1]
    one.
    [2]
    two.
    [3]
    3.
    [4]
    Four.
    [5]
    5.
    [6]
    6. - Sensor device (1) according to one of the preceding claims, in which the fixing equipment (7) has a first clamping piece (71) coupled to the printed circuit board equipment (2), which preferably is made by the sensor housing (8), and a second clamping piece (72) prestressed with respect to the first clamping piece (71) and arranged opposite the first chamber delimiting section (4A).
    [7]
    7. - Sensor device (1) according to one of claims 1 to 5, wherein the first chamber delimiting structure (4A) is formed at least partially by a magnetic or magnetizable material, presenting the fixing device (7 ) a first magnetic piece (73) for magnetic coupling to the magnetic or magnetizable material of the first chamber delimiting structure
    (4A).
    [8]
    8.
    [9]
    9. - Sensor device (1) according to one of claims 1 to 5, in which the fixing equipment (7) is formed by a fixing tape (75) that is attached to the printed circuit board equipment (2 ) and that presents an adhesive layer for adhesion to the plant sample (P).
    [10]
    10.
    [11]
    eleven.
    [12]
    12.
    [13]
    13.
    [14]
    14. - Sensor device (1) according to one of the preceding claims, further comprising:
    a mechanical flow limiting device (90), by means of which the cross-sectional area of the first ventilation opening (6A) can be varied.
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    同族专利:
    公开号 | 公开日
    DE102019205896A1|2020-10-29|
    EP3959514A1|2022-03-02|
    ES2881855R1|2022-01-27|
    WO2020216682A1|2020-10-29|
    引用文献:
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    US4160374A|1978-04-24|1979-07-10|Crump Terence J|Apparatus for measuring the diffusive resistance of plant stomata|
    US4312218A|1979-09-04|1982-01-26|Li-Cor, Inc.|Porometer and method for stomatal measurements|
    AU2003902836A0|2003-06-06|2003-06-26|M.B.T.L. Limited|Environmental sensor|
    JP3994975B2|2004-02-27|2007-10-24|株式会社デンソー|Capacitive humidity sensor|
    AT517281A1|2015-05-28|2016-12-15|Vasema Diagnostics Ag|sensor arrangement|
    US10809240B2|2016-01-27|2020-10-20|The Penn State Research Foundation|Sensors for measuring water/solute content and thickness of plant tissue|
    法律状态:
    2021-11-30| BA2A| Patent application published|Ref document number: 2881855 Country of ref document: ES Kind code of ref document: A2 Effective date: 20211130 |
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    优先权:
    申请号 | 申请日 | 专利标题
    DE102019205896.5A|DE102019205896A1|2019-04-25|2019-04-25|Sensor device for measuring transpiration of a plant sample|
    PCT/EP2020/060807|WO2020216682A1|2019-04-25|2020-04-17|Sensor apparatus for measuring transpiration of a plant specimen|
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