• 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 method for assessing diamonds of different quality characteristics in which a laser Raman spectrometer is initially calibrated by use of diamonds of known quality characteristics, the characteristics having been assessed for example by a conventional subjective procedure. Diamonds of unknown quality characteristic are successively placed in the spectrometer and irradiated with laser radiation of known frequency. The intensity of the scattered Raman signal from the diamond of unknown quality is monitored for one or more orientations of the diamond, the resultant signal being capable of relation to the quality of the diamond.
    公开号:SU1658829A3
    申请号:SU874203279
    申请日:1987-08-18
    公开日:1991-06-23
    发明作者:Джейн Баули Хитер；Лесли Джеррард Дональд
    申请人:Дзе Бритиш Петролеум Компани, П.Л.С.(Фирма)；
    IPC主号:
    专利说明:

    The invention relates to the field of diamond quality research by optical methods and can be applied in the jewelry industry.
    The purpose of the invention is to improve the quality of diamond valuation by eliminating the influence of the expert's subjectivity.
    The drawing shows a diagram of a device for implementing a method for evaluating the quality of diamonds.
    A device that implements the method includes a source of laser radiation of known frequency, a collecting optical system 2, a monochromator 3, a diode array detector 4, a diamond holder 5 and a measured diamond 6.
    The invention is based on the property of a diamond that the Raman signal from diamonds
    significantly stronger than signals from other materials, for the reason that there is only C-C-bond in diamond, and its Raman signal appears in a place that is very different from signals from other minerals. Therefore, the Raman signal for diamonds is very specific. In addition, due to the presence in the diamond of only one type of C-C-link, there is only a single Raman signal, easily separated from the associated broadband fluorescence.
    In the device for implementing the method, there is a source of laser radiation 1 acting on a single frequency mode, i.e. providing radiation of one frequency. The radiation frequency is selected depending on the color type of the diamond being evaluated. Argon ion lao el is used
    00 00
    about

    with
    Spectra - Physics 2020 model with a wavelength of 514.5 nm. The laser operates at 50 mW with the maintenance of a constant photon flux. If necessary, the laser can work with other wavelengths.
    The analysis of scattered laser radiation is carried out using an Anspec-36 Raman laser spectrometer, which contains a collecting optical system 2, a monochromator 3, and a Retlcon-S diode array detector 4.
    The diamond holder 5 is adapted to keep the diamond 6 in the path of the light from the laser and can change the orientation of the diamond relative to the direction of the laser radiation.
    Before evaluating the quality of an unknown diamond, it is desirable to determine whether there are internal crystal defects in the diamond, such as inclusions. Such defects must be considered when assessing the quality of a diamond.
    The invention can be used to evaluate both faceted and uncut diamonds. Therefore, this method can be adapted to a group or continuous method of separating diamonds into groups of known quality from diamond-bearing material.
    It is desirable that diamonds of unknown quality belong to the same color type, for example, white, yellow, green, and it is also desirable to determine the color type of a diamond before evaluating its quality in an appropriate way. Diamonds are mostly white, yellow or green, so it is advisable to pre-classify diamonds by color types using appropriate methods.
    When implementing the method, the device is calibrated on diamonds of a known color class from 1 to 7. According to the color types, diamonds are yellow and green, with class 1 indicating the highest quality and class 7 the lowest. Quality is determined by standard subjective judgment.
    Each diamond is placed in a holder 5 and placed in the path of the light from the laser 1. The position of the diamond in the holder 5 is optimized to obtain the maximum Raman scattered radiation signal on the detector. The maximum intensity of the Raman signal is measured for several orientations of each diamond. The intensity is expressed as the number of photons counted in 1 s. Since in each case the scatter of results is insignificant, the average intensity value is calculated for each diamond.
    Raman signal. The cumulative accumulation time (the time required to count the number of photons in the Raman scattered radiation) is of the order of 1 s, with five diamonds being examined in each class (when possible). The accumulation time depends on the frequency of the incident laser radiation and the color type of the diamond.
    The intensity of the Raman radiation is measured with a diode array detector 4. The use of photomultipliers is also possible as a detector.
    Table 1 presents the results for
    yellow diamonds 1-7 kpassov (incident radiation with a wavelength / Ts. 514, nm), and in table 2 - for green diamonds of 1-6 classes (incident radiation with a wavelength of AO 514.5 nm).
    The Raman intensity for each quality is determined by five diamond samples (if possible) and for each stone the Raman intensity value is calculated for five different orientations.
    diamond in the holder. It has been observed that, in each case, the Raman intensity changes little from the orientation due to its tetrahedral C – C valence mode.
    From examples of spectra obtained for
    for each color class, it can be seen that even in the lowest color class there is no significant background. This moment is important, since the signal at 1332 cm can be considered the Raman signal from diamond in the absence of fluorescence. Therefore, the described method can be used to estimate diamonds with different color classes.
    40
    权利要求:
    Claims (2)
    [1]
    1. A method for evaluating the quality of diamonds, which consists in directing electromagnetic radiation to a diamond,
    register the scattered radiation and judge the quality of diamonds, characterized in that. in order to improve the quality of the assessment, diamonds are pre-sorted according to their color types, into diamonds of known color
    with unknown qualitative characteristics direct the laser radiation of a known frequency and intensity, record the intensity of the scattered Raman radiation, and judge the quality
    diamond according to the intensity of recorded radiation by comparing with the intensity of Raman radiation scattered under similar conditions by diamonds of known color and quality.
    [2]
    2. The method according to claim 1, characterized in that the diamonds of unknown quality up to
    assessments are divided into size ranges.
    Table 1
    table 2
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1658829A3|1991-06-23|Method of assaying the quality of diamonds
    US4907875A|1990-03-13|Diamond separation process
    CA1138218A|1982-12-28|Material-testing method and apparatus
    US4804850A|1989-02-14|Measurement of fluorescence
    Bellon et al.1993|Feasibility and performances of a new, multiplexed, fast and low-cost fiber-optic NIR spectrometer for the on-line measurement of sugar in fruits
    US4799786A|1989-01-24|Method of diamond identification
    JPH0285750A|1990-03-27|Narrow frequency band radiation and detection of gem
    EP3111199B1|2020-12-02|Method of spectroscopic analysis of a diamond and apparatus thereof
    US5835200A|1998-11-10|Method and apparatus for examining an object
    US6331708B2|2001-12-18|Examining a diamond
    GB1452231A|1976-10-13|Method and apparatus for detecting and classifying nucleic acid particles
    US10823680B2|2020-11-03|Device for identifying a diamond
    EP0526492B1|2000-07-12|Method and apparatus for examining an object
    KR930700838A|1993-03-16|Object inspection method and apparatus
    WO1999057544A1|1999-11-11|Examining diamonds
    SU1651170A1|1991-05-23|Method for evaluating type of staple fibre
    SU1262349A1|1986-10-07|Method of investigating material
    EP3729063B1|2022-02-09|System and method for spectroscopy analysis of diamonds
    JPS5796241A|1982-06-15|Method and device for measuring density of impurity in semiconductor
    SU1150523A1|1985-04-15|Hard transparent material optical stability evaluation method
    GB2274165A|1994-07-13|Method and apparatus for examining an object
    SU1048379A1|1983-10-15|Raw flax quality evaluation method
    IL108513A|1996-03-31|Meth d and appar tus f r exa ining an object
    JPS5788348A|1982-06-02|Method and device for spectral fluorescence
    BG62304B1|1999-07-30|Method and photometric chamber for nondestructive classification and/or grading of fruit and vegetables depending on their internal quality regardless of the quality of their skins
    同族专利:
    公开号 | 公开日
    AU6778987A|1987-07-15|
    JPS63502052A|1988-08-11|
    KR880700932A|1988-04-13|
    WO1987003963A1|1987-07-02|
    IN168887B|1991-07-06|
    DK429987D0|1987-08-18|
    ZA869442B|1988-07-27|
    EP0250527A1|1988-01-07|
    BR8607050A|1988-02-23|
    CA1276482C|1990-11-20|
    DK429987A|1987-08-18|
    GB8531330D0|1986-01-29|
    US4875771A|1989-10-24|
    AU591226B2|1989-11-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US1799604A|1926-11-03|1931-04-07|Fayette F Read|Method and apparatus for identifying crystals|
    US3414354A|1964-10-28|1968-12-03|Perkin Elmer Corp|Raman spectrometers|
    ZA71900B|1971-02-12|1972-08-30|De Beers Cons Mines Ltd|Separation of particles by electromagnetic radiation|
    GB1416568A|1972-10-20|1975-12-03|Wilson S S|Method of and apparatus for evaluating registering andidentifying gemstones|
    DE7418353U|1974-05-27|1974-10-17|Eickhorst M|DEVICE FOR THE SPECTROSCOPIC EXAMINATION OF GEMSTONES|
    GB2010474A|1977-10-19|1979-06-27|Horchler S|Gem colour meter|
    DE2935812A1|1979-09-05|1981-03-12|Fa. Carl Zeiss, 7920 Heidenheim|METHOD FOR TESTING MATERIAL|
    US4259011A|1979-11-05|1981-03-31|Crumm John C|Optical gem analyzer|
    ZA813263B|1980-06-04|1982-06-30|De Beers Cons Mines Ltd|The assessment of colour in diamonds and other gems|
    FR2496888A1|1980-12-22|1982-06-25|Gemological Lab Antwerp|Automatic grading system for precious stones - comprises electronic weighing platform and laser optics and analysis equipment providing inputs for processor to resolve characteristics|
    JPS57158544A|1981-03-25|1982-09-30|Ii R C:Kk|Identifying method of jewel and ornament by measurement of quantity system and optical system, and its data processor|
    US4394580A|1981-07-27|1983-07-19|L.C.E. Ltd.|Method and apparatus for analyzing gems|
    GB2140555B|1983-05-24|1987-03-25|British Petroleum Co Plc|Diamond separation|
    US4620284A|1983-12-29|1986-10-28|Uop Inc.|Qualitative and quantitative analysis using Raman scattering|US4851376A|1986-03-08|1989-07-25|Ngk Insulators, Ltd.|Cordierite ceramic body having low thermal expansion coefficient, process for producing the same, and method of evaluating cordierite composition|
    GB8706422D0|1987-03-18|1987-04-23|British Petroleum Co Plc|Identification method|
    US5206699A|1988-05-06|1993-04-27|Gersan Establishment|Sensing a narrow frequency band of radiation and gemstones|
    US5835200A|1990-04-24|1998-11-10|Gersan Establishment|Method and apparatus for examining an object|
    GB9103552D0|1991-02-20|1991-04-10|Gersan Ets|Classifying or sorting|
    GB9418050D0|1994-09-07|1994-10-26|Gersan Ets|Examining a diamond|
    US5932119A|1996-01-05|1999-08-03|Lazare Kaplan International, Inc.|Laser marking system|
    US5717209A|1996-04-29|1998-02-10|Petrometrix Ltd.|System for remote transmission of spectral information through communication optical fibers for real-time on-line hydrocarbons process analysis by near infra red spectroscopy|
    US5966673A|1997-01-10|1999-10-12|Diamond Technologies, Inc.|System and method for computerized evaluation of gemstones|
    US6020954A|1997-12-18|2000-02-01|Imagestatistics, Inc.|Method and associated apparatus for the standardized grading of gemstones|
    US6980283B1|1997-12-18|2005-12-27|Imagestatistics, Inc.|Method and associated apparatus for the standardized grading of gemstones|
    US6473164B1|2000-02-16|2002-10-29|Gemological Institute Of America, Inc.|Systems, apparatuses and methods for diamond color measurement and analysis|
    US7260544B1|2000-10-12|2007-08-21|Gemological Institute Of America, Inc.|System and methods for evaluating the appearance of a gemstone|
    AU2002228571A1|2002-02-07|2003-09-02|Rgb Technologies Ab|Test method|
    US6786733B2|2002-10-15|2004-09-07|Overseas Diamonds Inc.|Computer-implemented method of and system for teaching an untrained observer to evaluate a gemstone|
    US7158240B2|2004-06-16|2007-01-02|The United States Of America As Represented By The Secretary Of The Army|Measurement device and method|
    US9262284B2|2006-12-07|2016-02-16|Lenovo Enterprise SolutionsPte. Ltd.|Single channel memory mirror|
    JP5222898B2|2010-05-17|2013-06-26|株式会社日立エルジーデータストレージ|Recording method, reproducing method, recording apparatus, and reproducing apparatus|
    EP2718694B1|2011-06-13|2020-03-18|President and Fellows of Harvard College|Efficient fluorescence detection in diamond spin systems|
    CN106198488B|2016-07-27|2017-10-13|华中科技大学|A kind of ature of coal quick determination method based on Raman spectrum analysis|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    GB858531330A|GB8531330D0|1985-12-19|1985-12-19|Differentiation process|
    [返回顶部]