CN106840404A - A kind of grading automatical measuring method of diamond color - Google Patents
A kind of grading automatical measuring method of diamond color Download PDFInfo
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- CN106840404A CN106840404A CN201611037318.2A CN201611037318A CN106840404A CN 106840404 A CN106840404 A CN 106840404A CN 201611037318 A CN201611037318 A CN 201611037318A CN 106840404 A CN106840404 A CN 106840404A
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- 239000010432 diamond Substances 0.000 title claims abstract description 76
- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000009792 diffusion process Methods 0.000 claims abstract description 4
- 238000001228 spectrum Methods 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 4
- 239000013307 optical fiber Substances 0.000 claims description 4
- 230000003595 spectral effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 26
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000010437 gem Substances 0.000 abstract description 2
- 229910001751 gemstone Inorganic materials 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 abstract description 2
- 239000004575 stone Substances 0.000 description 22
- 238000012360 testing method Methods 0.000 description 21
- 238000010586 diagram Methods 0.000 description 5
- 230000036651 mood Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 210000000887 face Anatomy 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000004456 color vision Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000004438 eyesight Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 238000004153 renaturation Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000012549 training Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Spectrometry And Color Measurement (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The present invention relates to color of gemstones e measurement technology, a kind of grading automatical measuring method of diamond color is particularly disclosed.The grading automatical measuring method of the diamond color, it is characterized by, the booth portion region for being tested diamond sample is vertical with microscopical zoom lens, and light enters tested diamond sample after diffusion；After collection signal amplifies through zoom camera lens, Ray Of Light is imaged into image CCD, and is shown in locating and displaying device；Another Ray Of Light enters spectrometer, enters traveling optical signal light splitting collection, measures color coordinate values x, y of sample, and x, y value of color coordinates are converted into system program the color grading value met in eye-observation hierarchy system automatically.Difference of the method for the present invention with the current color measurement system for using in itself is, the diamond automatic classification under the conditions of eye-observation can be realized meeting, and solve the problems, such as insurmountable measurement discreteness and the color grading error of current diamond color measurement system.
Description
（One）Technical field
The present invention relates to color of gemstones e measurement technology, more particularly to a kind of grading automatical measuring method of diamond color.
（Two）Background technology
Diamond color is a very important index in diamond evaluation, and national standard is divided into 12 continuously by diamond color change
Color rank, represented with letter and number：
Above-mentioned each color rank than colored stone all by demarcating.Standard set in color grading is essential than colored stone
, China compares colored stone using a set of 11 Standard Colors.Diamond color classification all the time is entered mainly by the mode of eye-observation
OK.This eye-observation mode requires very strict：
（1）Require that color colour vision is normal for related personnel, received the professional of technical skill training.Commenting timing demands two
The color grading of the name above same diamond of technical staff's complete independently, and obtain unified result；
（2）It is muted color that environmental condition working region requires, i.e. white, black, or grey.The light of working region should avoid removing
The irradiation of the light beyond classification standard sources.
In addition, it is also many to Color influences factor in diamond grading, such as diamond to the absorption of white light, when one
It is clear, colorless that Shu Baiguang is not absorbed the then diamond through diamond, if diamond absorbs the light of a certain part wavelength in white light
Line, then diamond will produce color.The light source for irradiating diamond sample also directly can produce influence to diamond color, such as under incandescent lamp
Can be completely different with the color of observed under daylight.Different human eyes feels it is different, wherein influence amount to color and brightness
Maximum is influence factor of the different size of diamond to color, and with the diamond of level of the same colour, particle is bigger, and perceived color is more yellow；
Particle is smaller, and perceived color is whiter.
In sum, the color grading of diamond is due to the influence of each correlative factor so that appraisal is extremely complex, work
Efficiency is low and easily causes classification error.The reason for causing these errors, is the susceptibility due to human eye to color, can be due to year
Age, environment and mood and change.In fact, perception straight acceptable learning and physiological influence of people's eye Cone shapes cell on color,
This Industry far from disclosure satisfy that the demand of diamond market huge at present.
In recent years, the automatic classification of diamond color increasingly tends to automation, is not only the process of exchange in diamond trader
In and in appreciation laboratory all begin to use the method for automatic measurer automatic measurements it is advantageous that having fine
Measurement repdocutbility, do not influenceed by external environment condition and mood and mood but the diamond color that presently, there are is automatically analyzed
There is both sides in method:
One is because current measuring method is that tested diamond sample is positioned over into integrating sphere window, the platform of the main irradiating sample of light
Face, light injects detector and carries out data acquisition after being reflected through diamond sample surface by the slow reflection of integrating sphere inner surface.This
The mode that measuring method does not substantially meet human eye colorimetric is planted,（Eye-observation colorimetric mode is required to include:1. being observed diamond needs
Have unified positioning, almost right-angle view surface direction .2. under a white background, 3. by with correct ultraviolet
The result of the D65 light sources irradiation .4. observations of content must be that the average value 5. on each surface has a set of colorimetric with Standard Colors
Masonry is reference）So having differences so as to cause point by the way of the result and human eye vision color of this kind of method detection
The difference of level result.
Two is due to different size, diamond sample of different shapes, due to the angle and the shadow of light path of reflecting surface during measurement
Ring, i.e., light path of bulky its light of diamond inside will be grown, and its light path of the diamond of small volume is short, the length of light path
The saturation degree of color of diamond is influenced whether such as in by the diamond sample of cutting, its distribution of color is different, and tone is dense
Degree concentrates on girdle and booth portion and the position near low point.This point is very important viewing area in human eye colorimetric.And
It is that cannot be distinguished by and solve such problem using integration type measuring method, produces classification difference during measurement.With eye-observation
Result is inconsistent.
（Three）The content of the invention
The present invention is in order to make up the deficiencies in the prior art, there is provided a kind of to meet the small diamond color of eye-observation condition, error
Grading automatical measuring method.
The present invention is achieved through the following technical solutions：
A kind of grading automatical measuring method of diamond color, comprises the following steps：
（1）Tested diamond sample is placed in V-shaped groove, light source irradiation V-shaped groove surface is tested the booth portion region of diamond sample and shows
The zoom lens of micro mirror is vertical, and light enters tested diamond sample after diffusion, and collection signal is projected by through tested diamond sample
And reflection light composition；
（2）After collection signal amplifies through zoom camera lens, Ray Of Light is imaged through semi-permeable and semi-reflecting mirror into image CCD, and fixed
Shown in the display of position；
（3）Another Ray Of Light enters entrance spectrometer slit through the reflecting surface of semi-permeable and semi-reflecting mirror by light-conductive optic fibre, carries out light
Signal light splitting is gathered, and measures color coordinate values x, y of sample, and system program automatically changes x, y value of color coordinates
As the color grading value met in eye-observation hierarchy system.
More excellent technical scheme of the invention is：
Step（1）In, D65 light sources irradiation V-shaped groove surface, V-shaped groove surface is a white diffusing surface, and the average diffusing reflection rate of spectrum is
95% and without spectral selection；V-shaped groove bottom is provided with adjustable two-dimensional stage, the rotation in the V-shaped groove of the tested diamond sample of adjustment
Gyration.
Step（3）In, light-conductive optic fibre is SMA905 optical fiber；System program internal memory contains the data for meeting CIE color systems.
The invention provides a kind of brand-new measurement theory and method, the subversive measurement mould for changing current use
Formula：
（1）The method of the present invention is based on the condition for complying fully with eye-observation color grading；Including：Meet CIE standard illuminants
Body D65 observation conditions, employ white diffusing reflection background, it is stipulated that measurement diamond sample face viewing angle, meet eye-observation
When the sight line observation condition vertical with booth portion；Each sightingpiston of tested diamond can be easily rotated, to carry out the flat of each surface
The measurement of average, so that it is guaranteed that the measuring method of the application is consistent with the result that human eye is classified.
（2）Employ being accurately positioned and the method for sampling for micro- microcell, i.e., it is pinpoint by the way of transmission measurement
Purpose is completely the same with the observation position of standard colorimetric stone in order to ensure the measured point of measurement, it is ensured that the measurement weight of tested diamond
Renaturation and repdocutbility, it is most important that solve the color measuring error that sample size causes, fundamentally solve mesh
In the integration type measuring method that preceding in the market is taken, due to diamond-shaped size, the measurement result that different putting positions causes
Discreteness, substantially increase the precision of measurement.
（3）The measuring method for having used standard colorimetric stone to calibrate, each rank face is carried out using the standard colorimetric stone of series
The gradation calibration of color, eliminates instrument linearity error, greatly improves the degree of accuracy in whole measurement range, it is ensured that color coordinates
Precision in 0.0003 error range.
（4）System-computed method is developed, the color coordinates of system and turning for grade scale can be easily measured
Change so that color grading really turns into automation.
Therefore the method for the present invention be diamond color classification fields of measurement one kind initiate.
（Four）Brief description of the drawings
The present invention is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is colorimetric stone chromaticity coordinate schematic diagram of the present invention；
Fig. 2 is 11 all test result schematic diagrames of standard sample of the invention；
Fig. 3 is the present invention not test result contrast schematic diagram in the same time；
Fig. 4 is difference of the invention than the difference schematic diagram between colored stone；
Fig. 5 simulates schematic diagram than colored stone standard specimen actual measured value and equidistantly for the present invention, wherein, series 1 is actual measured value,
Series 2 is the equidistant analogue value.
（Five）Specific embodiment
Embodiment：
The present invention is mainly made up of sample collection system, micro- microcell locating and displaying system, spectra collection computing system.
（1）Sample collection system includes:
Meet the light source of CIE standard illuminants D65, adjustable two-dimensional stage and V-shaped groove.
Tested diamond sample is placed in V-shaped groove, light source irradiation V-shaped groove surface, the surface is a white diffusing surface, spectrum
Average diffusing reflection rate is 95% and without spectral selection, and the V-shaped groove ensures that the side of tested diamond sample and measurement head keep hanging down
Directly.The V-shaped groove is an adjustable state simultaneously, and adjustment purpose enables that diamond sample each measuring surface in groove is convenient
Rotation, is convenient for measuring.Light enters sample after diffusion.Collection signal is by through tested diamond sample transmission and reflection light
Composition.
（2）Micro- microcell locating and displaying system
Zoom camera lens, focusing system, area array CCD, optical fiber, locating and displaying device.
By focusing system and zoom camera lens, the sample surface of amplification is clearly indicated over the display, it is mobile
Tested diamond sample, makes its bottom enter Position Scale.
（3）Spectra collection computing system
CCD spectrometers and semi-permeable and semi-reflecting mirror.
Measurement signal enters entrance spectrometer slit through the reflecting surface of semi-permeable and semi-reflecting mirror by SMA905 optical fiber.Carry out
Optical signal light splitting is gathered, and measures the automatic x by color coordinates of color coordinate values x, y. system program of sample, and y values turn
Change into meet the color grading value in eye-observation hierarchy system.
The automatic testing method of accurate diamond sample has turned into the emphasis problem of current international and domestic research, the purpose is to
The measuring accuracy of diamond color classification is improved, while changing the traditional approach of conventional eye-observation, detection efficiency is improved.
Difference of the method for the present invention with the current color measurement system for using in itself is can to realize meeting human eye
Diamond automatic classification under observation condition, and solve current diamond color measurement system it is insurmountable measurement discreteness and
The problem of color grading error；After the inventive method is realized, domestic each jewelry quality inspection station, each Scientific Research in University Laboratory are disclosure satisfy that, with
And the demand in the field such as jewelry trade market whole seller, diamond retailer；Good economic benefit and social benefit will be produced, carried
Technical merit of the industry high in terms of diamond color classification.
Embodiment 2：Experimentation
（1）The uniformity test of sample
Through repeatedly comparing, from the mark things in 2013 that NGTC is developed, measure result and calculate system-computed by color, obtain diamond
The chromaticity coordinate (x, y) of color, projects as shown in Figure 1, it is seen that all subpoints are linearly distributed substantially in reference axis, except G,
Outside H, I, overall uniformity is preferable.
X, y between adjacent color level, the difference between index are as shown in the table.
（2）The stability of result, error testing
By taking D color diamonds as an example, the same test surfaces of fixation, follow-on test ten times, acquired results are as shown in the table.
By data in table can see test result stability and repdocutbility preferably, due to test system tightness with
And the precision influence of automation calculation procedure, still there is certain error, but result or more stable, belong to acceptable
Scope.
The average value that x is can see by data in table is 0.3176, and maximum is 0.3177, and deviation is 0.0001；It is minimum
It is 0.3175 to be worth, and deviation is 0.0001, therefore the deviation of x values is within ± 0.0001.Similarly, in the same way, y is calculated
Within ± 0.0002, within ± 0.0002, the deviation of exponential quantity is within ± 0.00021 for the deviation of Y value for the deviation of value.
（3）The difference of same sample different faces test result
11 the 8 of sample test surfaces of test, (x, y) value of acquired results are projected, as shown in Figure 2.It can be seen that same
The different faces of diamond have differences, and x values maximum difference is 0.0019, and minimum difference is 0.0006；Y value maximum differences are
0.0025, minimum difference is 0.0006（Following table is different test surfaces difference maximum statistical forms）.This species diversity may be with diamond
The factor such as internal inclusion enclave and the cut of diamond is relevant.
（4）The repdocutbility of test result
11 samples are tested at the different moment, three test results are contrasted.As shown in Figure 3, it is seen that the repdocutbility of test result
Preferably.Three test results of contrast, the x of assorted level diamond, y, the difference maximum of index is as shown in the table.As can be seen here, though
So in the same time not there is certain error in test, but error is in the range of adjacent color grade difference, therefore measurement error can be with
Receive.
（5）Different series are contrasted than colored stone
In addition, be analyzed for its result than colored stone by many sets of selection test.Except the diamond that above-mentioned national center is developed
Color level than colored stone standard sample outside, also select that there is NGTC and HRD certificates respectively
Two sets are tested than colored stone.
Ratio colored stone with national center certificate totally 11, color include D, E, F, G, H, I, J, K, L, M,<N；With HRD
The ratio colored stone of certificate totally 9, color includes D, E, F, G, H, I, J, K, L.
Three sets of test results than colored stone are compared to each other, as a result as shown in Figure 4.
As can be seen here, there is certain difference between the ratio colored stone of different series, although numerically substantially linear, but
, also there is larger difference in terms of the numerical value of mutually homochromy level and in terms of the uniformity of entirety in the ratio colored stone of different series.
（6）The establishment of automatic classification system
Following table is actually to be measured and the equidistant analogue value than colored stone standard specimen
Value measured by contrast colored stone standard specimen carries out linear fit, as shown in Fig. 2 fitting a straight line formula is y=1.4392X-
0.1217。
Test result is equidistantly simulated so that uniformity is had more between numerical value, such as upper table and Fig. 5 institutes before and after simulation
Show.This simulation has the meaning of directiveness for the selection than colored stone, by by color data, can more accurately choose
Ratio colored stone of the choosing with uniformity.
Claims (5)
1. the grading automatical measuring method of a kind of diamond color, it is characterized by, comprise the following steps：（1）Tested diamond sample is put
In in V-shaped groove, light source irradiation V-shaped groove surface, the booth portion region for being tested diamond sample is vertical with microscopical zoom lens, light
Enter tested diamond sample after diffusion, collection signal is constituted by through tested diamond sample projection and reflection light；（2）Collection letter
After number amplifying through zoom camera lens, Ray Of Light enters image CCD and is imaged through semi-permeable and semi-reflecting mirror, and aobvious in locating and displaying device
Show；（3）Another Ray Of Light enters entrance spectrometer slit through the reflecting surface of semi-permeable and semi-reflecting mirror by light-conductive optic fibre, carries out light
Signal light splitting is gathered, and measures color coordinate values x, y of sample, and system program automatically changes x, y value of color coordinates
As the color grading value met in eye-observation hierarchy system.
2. the grading automatical measuring method of diamond color according to claim 1, it is characterised in that：Step（1）In, D65 light
Source irradiation V-shaped groove surface, V-shaped groove surface is a white diffusing surface, and the average diffusing reflection rate of spectrum is 95% and without spectral selection.
3. the grading automatical measuring method of diamond color according to claim 1, it is characterised in that：Step（1）In, V-shaped groove
Bottom is provided with adjustable two-dimensional stage, the anglec of rotation in the V-shaped groove of the tested diamond sample of adjustment.
4. the grading automatical measuring method of diamond color according to claim 1, it is characterised in that：Step（3）In, guide-lighting light
Fibre is SMA905 optical fiber.
5. the grading automatical measuring method of diamond color according to claim 1, it is characterised in that：Step（3）In, system journey
Sequence internal memory contains the data for meeting CIE color systems.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896546A (en) * | 2018-04-13 | 2018-11-27 | 山东省计量科学研究院 | A kind of grading automatical measuring device of diamond color |
| CN109668892A (en) * | 2019-01-28 | 2019-04-23 | 山东省计量科学研究院 | A kind of place of production identification method of Shandong saphire |
| WO2019141201A1 (en) * | 2018-01-17 | 2019-07-25 | Master Dynamic Limited | Colour grading process and system for jade |
| WO2020016874A1 (en) * | 2018-07-15 | 2020-01-23 | Sarine Technologies Ltd | System and method for evaluating and determining color in gemstones |
| CN114136750A (en) * | 2021-11-26 | 2022-03-04 | 国检中心深圳珠宝检验实验室有限公司 | Liquid standard sample for ruby color grading and preparation method thereof |
| CN114152340A (en) * | 2021-11-26 | 2022-03-08 | 国检中心深圳珠宝检验实验室有限公司 | Yellow diamond color grading liquid standard sample and preparation method thereof |
| CN116242829A (en) * | 2023-03-09 | 2023-06-09 | 江苏弘远晶体科技有限公司 | Automatic measuring device and method for grading diamond color |
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| CN114152340A (en) * | 2021-11-26 | 2022-03-08 | 国检中心深圳珠宝检验实验室有限公司 | Yellow diamond color grading liquid standard sample and preparation method thereof |
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| CN116242829B (en) * | 2023-03-09 | 2024-05-07 | 江苏弘远晶体科技有限公司 | Automatic measuring device and method for grading diamond color |
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| CN106840404B (en) | 2018-05-01 |
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