• 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 of assessing the colour type of diamonds by irradiating the diamonds with laser radiation of different wavelengths and generating a numerical value characteristic of the colour type of the diamond based on the measured intensities of the resultant scattered Raman radiation for two or more different incident radiation wavelengths. The colour type of the diamond may be determined by comparing derived relative intensities of each diamond with those of reference diamonds having been determined by standard subjective assessment. The method may also be used to sort diamonds according to their colour type.
    公开号:SU1709929A3
    申请号:SU884356494
    申请日:1988-08-15
    公开日:1992-01-30
    发明作者:Джейн Боули Хитер；Лесли Геррард Дональд
    申请人:Дзе Бритиш Петролеум Компани, П.С.Л. (Фирма)；
    IPC主号:
    专利说明:

    Raman radiation from diamond for each of the wavelengths of incident laser radiation; generating a numerical value characterizing the color type of the diamond, based on the measured intensities of the scattered Raman radiation for two or more different wavelengths of the incident laser radiation, and also by comparing the generated numerical value with the numerical values for diamonds of a known color type, resulting in a color type of diamond. Preferably, the numerical value is the relative intensity generated by the ratios of the intensities of the scattered Raman radiation for two different wavelengths of the incident laser radiation. Numerical values can be compared using a computer or microprocessor.
    Preferably, the diamonds are in the same size range. Therefore, it may be necessary to sort the diamonds by size range before using the proposed method and device. The invention can be used to determine the properties of both ground and unpolished diamonds.
    A diamond can be irradiated with a laser, by emitting two or more wavelengths (simultaneously or sequentially).
    The laser source may be a single laser capable of operating at two or more different predetermined wavelengths (simultaneously or sequentially). Alternatively, more lasers can be used, each of which is capable of operating at one or more different predetermined wavelengths (simultaneously or sequentially). A diamond can be held or supported by laser radiation with a holder. The diamond may be irradiated with laser radiation during its descent from the end of the conveyor belt, etc. Preferably, the orientation of the diamonds relative to the incident laser radiation is the same for all lasers if several are used.
    Raman radiation scattered from diamonds is filtered from other types of radiation using optical devices, such as collecting optical and monochromator. A detector, such as a photomultiplier or a multichannel detector (e.g., a diode array detector), can be used to measure the intensity of the Raman radiation.
    measuring the intensity of scattered radiation at two or more different wavelengths of the incident radiation can simultaneously be used several
    detectors or one multichannel detector.
    The invention may be adapted to the discrete or continuous method of isolating diamonds into groups with known
    0 color and quality of diamond-like materials. Sorting of diamonds can be done simultaneously by color and quality.
    It is envisaged that the proposed
    5 method can be used in relation to both natural and artificial diamonds. Since it is assumed that the color type of artificial diamonds characterizes the hardness of the diamond, the proposed
    0 method and apparatus can be used to determine the hardness of artificial diamonds /
    P r and m er. A device for implementing the method (FIG. 1) contains sources 1 and 2
    5 laser radiations 3 and 4 capable of producing Raman scattering of radiation 5 from diamond 6. Each source operates in the single-wave mode, i.e. at one time, radiation is emitted from only one
    0 wavelength. In this example, the wavelength of the laser radiation 3 from the source 1 can be changed, and the intensity of the Raman radiation can be measured at two wavelengths
    5 incident laser radiation. The laser used as source 1 is an argon-ion laser in Spectrum physics, model 2020. capable of producing radiation with a wavelength of 488 and
    0 514.5 nm. Laser isp | Called as source 2, it operates in single wavelength mode, i.e. Laser radiation 4 has a single wavelength. In this example, laser 2 is a krypton-ion spectrum laser in physics, model 164. capable of producing radiation with a wavelength of 647.1 nm. Both lasers operate in the light mode at a power of 50 mW, which maintains a constant photon polar ™ diamond holder 7 holds the diamond
    6 in laser light 3 and 4 and provides the possibility of changing the orientation of the diamond relative to the direction of the laser light 5.
    During operation of the device, measurement of the scattered Raman radiation 5 is carried out using a laser Raman spectrometer 8 Anaspek 36 containing a collecting optics 9. a monochromator 10 and
    detector 11 Reticon, type S. with a reinforced diode array. Other detectors, such as a photomultiplier, may also be used. The detector generates a digital output 12, which is a measure of the intensity of scattered Raman radiation 5,
    When the device is operating, diamond b is kept in holder 7, and laser radiations 3 and 4 with different wavelengths from lasers 1 and 2 are successively emitted to diamond 6. The position of the diamond (5 in holder 7 is optimized to obtain the maximum intensity of scattered Raman radiation 5 on the detector 1 T. The maximum intensity of the scattered Raman radiation is measured for several diamond orientations at each of the wavelengths of the incident laser radiation. The total accumulation time (the time required for counting the number of photons in the estimated Raman radiation is equal to 1 s. The required accumulation time depends on the frequency of the incident laser radiation and the color type of the diamond. The maximum intensities of the scattered Raman radiation are expressed by the number of photons counted in 1 s. x diamond is small; calculating fQT is the average value of the frame intensities of a new signal for diamond, which is here called the average Raman intensity. The average Raman intensity is determined for each of the three wavelengths of the incident laser radiation (514.5; 488 and 647.1 nm) in series. The diamonds 13 move on the moving conveyor 14 through the laser beam 15 from the laser 16. The latter is capable of operating at two or more different predetermined wavelengths simultaneously (all-linear mode). The Raman radiation 17 scattered from each diamond is measured using a spectrometer 18. including collecting optics 19, a monochromator 20, and a multi-channel detector 21. The latter creates digital output signals 22, which are a measure of the intensity of the scattered Raman radiation with two or more wavelengths of incident laser radiation. The microprocessor 23 creates a numerical value characterizing the color type of the diamond from the measured intensities and transmits the corresponding signal on line 24 to turn on the separator 25 in accordance with the generated numerical value. Preferably, the numerical value is the relative intensity generated from the ratio of the intensities of the scattered Raman radiation for two different wavelengths of the incident laser radiation. The separator 25 sorts the diamonds. sent them to the collectors 26 in accordance with the generated numerical value and, therefore, their color type. The separator 25 may be a group of conventional gas detectors, etc.
    In tab. 1 shows the results for yellow diamonds grades 1-7.
    In tab. 2 shows the results for green diamonds of grade 1-6, with
    class 1 means the highest quality, and class 7 the lowest quality. The colors and qualities are initially determined using the usual subjective assessment. Average raman intensities
    for each of the three wavelengths of the incident laser radiation are given for five batches of diamonds (where possible) for each quality class and each color type. Average raman intensities
    in each case, it is calculated from five different orientations of the diamond in the holder. It has been found that in each case, the orientation of diamond reflects little on the intensity of the Raman signal due to the presence in the diamond of a tetrahedral type of stretching of carbon-carbon bonds.
    In tab. 1 and 2 G1 also gives relative intensities, which are defined as the ratio of average Raman
    intensities, i.e. ISM.S, MSB and I5i4.5 / l647.i. where 1514.5 is the average Raman intensity for incident laser radiation with a wavelength of 515.5 nm, etc.
    Published tab. 1 and 2, it can be seen that the relative intensities are more or less constant and characterize the color type, i.e. yellow diamonds have a relative intensity of about 7 and 8, and green diamonds have about 4.
    From this example, we can conclude that the belonging of diamonds, whose color type is unknown, can be determined by comparing the obtained relative intensities of unknowns.
    diamonds with obtained relative intensities of diamonds, the color type of which is known.
    权利要求:
    Claims (3)
    [1]
    1. A method of sorting diamonds according to their color type, which consists of: that radiation of a known intensity is directed to a diamond, the radiation is recorded after it interacts with the diamond and is judged
    the diamond color type, from which the radiation is sent to a diamond with a known intensity at at least two wavelengths, which can cause Raman scattering, to record Raman scattering, in order to increase the sorting accuracy, register the intensity of the Raman scattering nor for each of the indicated wavelengths and judging the color type of diamonds by the ratio of registered Raman scattering intensities at different wavelengths.
    [2]
    2. A method according to claim 1, characterized in that radiation with a wavelength of 488.0, 514.5 or 647.5 nm is directed to the diamond.
    [3]
    3. Method pop. 1, characterized in that diamonds are sorted according to size ranges before determining their color type.
    Table 1
    ten
    1709929 Table2
    Schig2
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    同族专利:
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    EP0298103A1|1989-01-11|
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    GB878700917A|GB8700917D0|1987-01-16|1987-01-16|Separation process|
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