A device and method for identifying dyed black jade

Abstract

The application discloses a kind of dyed black jade identification device and identification method, belong to jade identification technical field, solve the problem that natural ink jade cannot be accurately, efficiently distinguished from black jade artificially treated in prior art.The identification device includes the ultra-depth microscope, laser confocal microscope and Raman spectrometer arranged in sequence.The identification method includes using ultra-depth microscope to collect the color distribution and structural characteristics of sample surface, and determine whether there is suspicious area of dyeing on sample surface;Using laser confocal microscope to collect the microtopography characteristics in suspicious area of dyeing, determine whether there is artificial dyeing area or dyeing area to be determined in suspicious area of dyeing;Using Raman spectrometer to test and collect the Raman spectrum in dyeing area to be determined, determine whether there is the characteristic peak of dye in Raman spectrum, if yes, determine that sample is dyed black jade, if not, determine that sample is ink jade.The application can be used for the identification of dyed black jade.

Description

Technical Field

[0001] This invention belongs to the field of jade identification technology, and in particular relates to an identification device and method for dyed black jade. Background Technology

[0002] According to the national standards "Jewelry and Gemstone Identification" (GB / T16553-2017) and "Identification and Classification of Hetian Jade" (GB / T38821-2020), black jade is defined as Hetian jade whose main color tone is grayish-black to black, with the black color mainly caused by graphite, and the black part is not less than 30%.

[0003] Currently, a type of black jade that has undergone artificial treatment such as dyeing has appeared in the jewelry and jade market. This black jade is completely black and basically opaque. Some merchants sell this black jade as black jade. However, the gemological characteristics of the aforementioned black jade are quite different from those of natural black jade.

[0004] With the continuous development of processing technology, the appearance of black jade stones that have undergone artificial treatment such as dyeing is becoming increasingly similar to that of black jade. For the identification of this type of black jade stone, conventional testing methods and procedures cannot completely determine the cause of its color, and cannot accurately and efficiently distinguish between natural black jade stone and artificially treated black jade stones. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide an identification device and method for dyed black jade, which solves the problem in the prior art that it is impossible to accurately and efficiently distinguish between natural black jade and artificially treated black jade.

[0006] The objective of this invention is mainly achieved through the following technical solutions:

[0007] This invention provides an identification device for dyed black jade, comprising a super depth-of-field microscope, a laser confocal microscope, and a Raman spectrometer arranged sequentially. The super depth-of-field microscope is used to collect the color distribution and structural features of the sample surface and delineate areas suspected of dyeing. The laser confocal microscope is used to collect the micromorphological features within the suspected dyeing areas and delineate areas to be determined regarding dyeing. The Raman spectrometer is used to collect the Raman spectrum within the areas to be determined regarding dyeing, and to determine whether there are characteristic peaks of dye in the Raman spectrum. If so, the sample is identified as dyed black jade; if not, the sample is identified as black jade.

[0008] Furthermore, the ultra-depth-of-field microscope and / or laser confocal microscope includes a sample stage, which includes a sample holder, a transverse support, a longitudinal support, and a transverse platform. The sample holder is rotatably connected to the transverse support and can rotate about the axis of the transverse support. The transverse support is slidably connected to the longitudinal support, and the longitudinal support is slidably connected to the transverse platform.

[0009] Furthermore, the sample holder includes an arc-shaped support plate, a support spring, and a suction cup. The suction cup is located on the inner arc surface of the arc-shaped support plate via the support spring, and the suction cup adsorbs the sample during identification.

[0010] This invention provides a method for identifying dyed black jade, comprising the following steps:

[0011] Step 1: Use an ultra-depth-of-field microscope to collect the color distribution and structural features of the sample surface, and determine whether there are artificially dyed areas or suspected dyed areas on the sample surface. If there are artificially dyed areas, the sample is determined to be dyed black jade. If there are suspected dyed areas, proceed to Step 2. If there are no artificially dyed areas or suspected dyed areas, the sample is determined to be black jade.

[0012] Step 2: Use a laser confocal microscope to collect micromorphological features within the suspected dyeing area to determine whether there is an artificially dyed area or a dyeing area to be determined. If there is an artificially dyed area, the sample is determined to be dyed black jade. If there is a dyeing area to be determined, proceed to Step 3. If there is no artificially dyed area or dyeing area to be determined, the sample is determined to be black jade.

[0013] Step 3: Use a Raman spectrometer to collect the Raman spectrum of the area to be identified by dyeing, and determine whether there are characteristic peaks of the dye in the Raman spectrum. If there are, the sample is identified as dyed black jade. If not, the sample is identified as black jade, thus completing the identification of dyed black jade.

[0014] Further, step 1 includes the following steps:

[0015] Step 11: Place the sample on the sample stage of the ultra-depth-of-field microscope;

[0016] Step 12: Observe the overall characteristics of the sample to see if there are any suspected dye residues, enrichment phenomena, or structurally distinctive locations. If so, proceed to Step 3.

[0017] Step 13: Observe and test the locations suspected of having dye residue, enrichment, or structural features, and obtain 3D images to observe and analyze the color distribution and surface unevenness of the sample to determine whether there are artificially dyed areas or suspected dyed areas. If there is obvious color enrichment in cracks, pits, or particle boundaries, it is determined that the sample has artificially dyed areas, and the sample is dyed black jade. If the color enrichment in cracks, pits, or particle boundaries is not obvious, and the ultra-depth-of-field microscope cannot further observe and accurately measure finer micromorphological features, it is determined that the sample has suspected dyed areas.

[0018] Furthermore, in step 12, the magnification of the super depth-of-field microscope is 20 to 100 times.

[0019] Furthermore, in step 13, the magnification of the super depth-of-field microscope is 100 to 200 times.

[0020] Furthermore, step 2 includes the following steps:

[0021] Step 21: Place the sample on the sample stage of the laser confocal microscope and perform microscopic and three-dimensional morphological analysis on the surface of the suspected stained area in white light mode.

[0022] Step 22: Perform 3D measurements of the surface roughness, height, and steps of the suspected dyed area in laser mode;

[0023] Step 23: Based on the morphology, roughness, and height difference of the suspected dyeing area, compare it with black jade. If the suspected dyeing area contains areas with loose structure, roughness exceeding the threshold, height difference exceeding the threshold, and residual dye, shrinkage pores, and flow lines (artificial treatment characteristics), it is determined that the sample has been artificially treated, and the area is judged as an artificially dyed area. If the suspected dyeing area contains areas with loose structure, roughness exceeding the threshold, height difference exceeding the threshold, and residual dye, shrinkage pores, and flow lines (artificial treatment characteristics), but not all of them, the area is judged as a dyeing undetermined area. If the suspected dyeing area does not contain any of the following characteristics: loose structure, roughness exceeding the threshold, height difference exceeding the threshold, residual dye, shrinkage pores, and flow lines (artificial treatment characteristics), the sample is determined to be black jade.

[0024] Furthermore, in step 21, the magnification of the laser confocal microscope is 50 to 500 times.

[0025] Furthermore, step 3 includes the following steps:

[0026] Linear extension is performed on the area to be stained, and the parts with color variations on the surface of the area to be stained are connected into a straight line. Continuous line scanning is performed to collect spectra and observe the changes in Raman spectra at different positions along this straight line.

[0027] If the Raman spectrum contains characteristic peaks of the dye, the sample is determined to be dyed black jade; otherwise, the sample is determined to be black jade.

[0028] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0029] A) The identification method for dyed black jade provided by this invention uses a combination of spectroscopic features, such as ultra-depth-of-field microscope, laser confocal microscope, and Raman spectrometer, to identify the sample, thereby continuously narrowing down the range of samples to be identified. This method can accurately and quickly distinguish between black jade and artificially dyed black jade. The entire identification process is clear, simple, and has a low error rate.

[0030] B) The identification method for dyed black jade provided by this invention, in the identification process, firstly, uses an ultra-depth-of-field microscope to preliminarily judge the sample and determine whether there are artificially dyed areas or suspected dyed areas, reducing the scope of subsequent identification by laser confocal microscopy and Raman spectroscopy; then, uses laser confocal microscopy to identify suspected dyed areas, again determining whether there are artificially dyed areas or dyed areas to be determined. Laser confocal microscopy has sub-micron to nanometer resolution and can simultaneously acquire color information, shape information, and high-resolution images. Utilizing its advantages in 3D imaging and fine measurement, its performance in... In the identification of natural and synthetic gemstones, the assessment of gemstone enhancement treatments, and the evaluation of gemstone quality, the 3D color high-resolution imaging of laser confocal microscopy can present images of localized micro-regions, finely depicting the microscopic morphology and color distribution of the sample surface. This allows for more accurate identification of areas with artificial dyeing or areas to be identified. Finally, Raman spectroscopy is used to collect the characteristic peaks of the dye in the sample from the areas to be identified. The accuracy of Raman spectroscopy is higher than the previous two identification methods. Once the characteristic peaks of the dye are collected, it can be determined without doubt that the sample is a dyed black gemstone.

[0031] C) The identification method for dyed black jade provided by this invention, by determining the suspected dyeing area and the dyeing undetermined area step by step, and by making the steps technically interconnected, eliminates the need for repeated observation and analysis of the entire sample in subsequent identification. It only requires narrowing the detection range of subsequent identification, thereby enabling accurate and rapid identification of black jade and artificially dyed black jade.

[0032] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0033] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0034] Figure 1 This is a test image of a sample under a super depth-of-field microscope at a low magnification of 20 to 100 in the method for identifying dyed black jade provided in Embodiment 1 of the present invention.

[0035] Figure 2 This is a test image showing the color enrichment phenomenon visible in cracks, pits, or grain boundaries in the identification method of dyed black jade provided in Embodiment 1 of the present invention.

[0036] Figure 3This is a test diagram of the shrinkage pores of the sample surface residue in the identification method of dyed black jade provided in Embodiment 1 of the present invention;

[0037] Figure 4 The flow pattern test image of the sample collected by laser confocal microscope in the identification method of dyed black jade provided in Embodiment 1 of the present invention;

[0038] Figure 5 The test image shows a sample with a loose and non-dense structure, obtained using a laser confocal microscope in the identification method for dyed black jade provided in Embodiment 1 of the present invention.

[0039] Figure 6 The microscopic morphology and roughness characteristic test image of the sample collected by laser confocal microscope in the identification method of dyed black jade provided in Embodiment 1 of the present invention shows that the location of dye residue is obviously raised.

[0040] Figure 7 This is a comparison of Raman spectra of natural black jade and dyed black jade in the identification method of dyed black jade provided in Embodiment 1 of the present invention.

[0041] Figure 8 This is a schematic diagram of the sample stage in the identification device for dyed black jade provided in Embodiment 2 of the present invention. The arrow indicates the direction of movement.

[0042] Figure label:

[0043] 1-Horizontal support; 2-Longitudinal support; 3-Horizontal platform; 4-Arc-shaped support plate; 5-Support spring; 6-Suction cup; 7-Spherical hinge structure; 8-Shaft sleeve. Detailed Implementation

[0044] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of the present invention and, together with the embodiments of the present invention, serve to illustrate the principles of the present invention.

[0045] The identification of jewelry and gemstones mainly involves testing with instruments and equipment such as gem microscopes, ultraviolet-visible spectrometers, and infrared spectrometers.

[0046] Gem microscopes are primarily used to magnify and observe the internal and external characteristics of gemstones, including inclusions, color distribution, and structural features. Analyzing the internal and external characteristics of gemstones using a gem microscope can provide a preliminary distinction between natural and synthetic gemstones. However, the maximum magnification of a gem microscope is generally only around 40-70x. The main limitation of this method is that it can only analyze the internal and external characteristics of samples at low magnification, and cannot effectively identify very fine inclusions and other subtle features.

[0047] Ultraviolet-visible (UV-Vis) spectroscopy can analyze the color formation of gemstones and is primarily used to identify natural gemstones and those that have undergone artificial coloring. However, it is not suitable for some gemstones that lack effective characteristic absorption peaks in the UV-Vis region. Actual test results demonstrate that UV-Vis spectroscopy cannot accurately distinguish between graphite-colored gemstones and artificially colored black gemstones.

[0048] The main applications of infrared spectroscopy in gemstone identification are to determine the species of gemstones, differentiate between some natural and synthetic gemstones, and distinguish between some natural and treated gemstones. Most artificially treated gemstones, such as those treated with dye, cannot have their color determined by infrared spectroscopy. Therefore, while infrared spectroscopy can identify the main mineral components and species of black gemstones, it cannot determine the cause of their color.

[0049] Example 1

[0050] This embodiment provides a method for identifying dyed black jade according to the present invention. It utilizes a super depth-of-field microscope, laser confocal microscope, and Raman spectroscopy to comprehensively analyze and determine the cause of the black jade's color. The identification method includes the following steps:

[0051] Step 1: Use an ultra-depth-of-field microscope to collect the color distribution and structural features of the sample surface, and determine whether there are artificially dyed areas or suspected dyed areas on the sample surface. If there are artificially dyed areas, the sample is determined to be dyed black jade. If there are suspected dyed areas, proceed to Step 2. If there are no artificially dyed areas or suspected dyed areas, the sample is determined to be black jade.

[0052] Step 2: Use a laser confocal microscope to collect micromorphological features within the suspected dyeing area to determine whether there is an artificially dyed area or a dyeing area to be determined. If there is an artificially dyed area, the sample is determined to be dyed black jade. If there is a dyeing area to be determined, proceed to Step 3. If there is no artificially dyed area or dyeing area to be determined, the sample is determined to be black jade.

[0053] Step 3: Use a Raman spectrometer to collect the Raman spectrum of the area to be identified by dyeing, and determine whether there are characteristic peaks of the dye in the Raman spectrum. If there are, the sample is identified as dyed black jade. If not, the sample is identified as black jade, thus completing the identification of dyed black jade.

[0054] Compared with existing technologies, the identification method for dyed black jade provided by this invention uses a combination of spectroscopic features, such as ultra-depth-of-field microscope, laser confocal microscope, and Raman spectrometer, to identify the sample, continuously narrowing down the range of samples to be identified. This enables accurate and rapid identification of black jade and artificially treated dyed black jade. The entire identification process is clear, simple, and has a low error rate.

[0055] Specifically, in the identification process, firstly, a super depth-of-field microscope is used to initially assess the sample and determine whether there are artificially dyed areas or suspected dyed areas, reducing the scope of subsequent identification by laser confocal microscopy and Raman spectroscopy. Then, laser confocal microscopy is used to identify suspected dyed areas, further confirming the presence of artificially dyed areas or areas to be determined by dyeing. Laser confocal microscopy, with its submicron to nanometer resolution, can simultaneously acquire color information, shape information, and high-resolution images. Leveraging its advantages in 3D imaging and precise measurement, its application in identifying natural and synthetic gemstones, judging the enhancement treatment of gemstones, and evaluating gemstone quality is analyzed. The 3D color high-resolution imaging of laser confocal microscopy can present images of localized micro-regions, finely depicting the microscopic morphology and color distribution of the sample surface, thus more accurately identifying the presence of artificially dyed areas or areas to be determined by dyeing. Finally, Raman spectroscopy is used to collect the characteristic peaks of the dye in the samples with areas to be determined by dyeing. The identification accuracy of Raman spectroscopy is higher than the previous two identification methods; once the characteristic peaks of the dye are collected, it can be determined without doubt that the sample is dyed black jade.

[0056] Furthermore, by identifying suspected and undetermined dyeing areas step by step, subsequent identification does not require repeated observation and analysis of the entire sample. Instead, it only requires narrowing down the detection range for subsequent identification, thereby enabling accurate and rapid identification of black jade and artificially dyed black jade.

[0057] Specifically, in order to improve the accuracy and detection rate of dyed black jade in step 1, step 1 includes the following steps:

[0058] Step 11: Place the sample on the sample stage of the ultra-depth-of-field microscope or clamp the sample with a sample clip. Observe and adjust the sample state through the instrument software operation platform. By continuously adjusting the position of the sample and the observation angle, find the characteristic position.

[0059] Step 12: Observe the overall characteristics of the sample at a low magnification of 20–100, see [reference needed]. Figure 1 Observe whether there are suspected dye residues, enrichment phenomena or structurally distinctive locations. If so, proceed to step 3.

[0060] Step 13: Observe and test suspected dye residues, enrichment phenomena, or structurally distinctive locations at a higher magnification (e.g., 100–200x). Obtain 3D images to observe and analyze the color distribution and surface unevenness of the sample, judging subtle changes in color and structure. These subtle changes help determine if there are artificially dyed areas or suspected dyed areas. If there is obvious color enrichment in cracks, pits, or particle boundaries, see [further details needed]. Figures 2 to 3 If the color is concentrated in cracks, pits, or grain boundaries, and the ultra-depth-of-field microscope cannot further observe and accurately measure finer micromorphological features, it is difficult to accurately determine whether the jade sample has been artificially treated, thus confirming that the sample has a suspected dyed area.

[0061] Similarly, in order to improve the accuracy and detection rate of dyed black jade in step 2, step 2 includes the following steps:

[0062] Step 21: Place the sample on the stage of a laser confocal microscope. Perform microscopic and three-dimensional morphological analysis on the surface of the suspected dyeing area under white light mode, at a magnification of 50–500x. Observe and analyze the surface color changes, crack size, morphology, and distribution; the presence and distribution characteristics of fine dye residues; other signs of artificial treatment; and the structural characteristics of the jade. (See [reference needed]). Figure 4 ;

[0063] Step 22: Perform fine 3D measurements of the surface roughness, height, and steps of the suspected dyeing area in laser mode. This allows for the accurate calculation of the morphology and height differences of the subtle color partitions within the suspected dyeing area, and analysis of the surface roughness of the suspected dyeing area.

[0064] Step 23: Based on the morphology, roughness, and height difference of the suspected dyeing area, compare it with black jade. If the suspected dyeing area contains areas with loose structure, roughness exceeding the threshold, height difference exceeding the threshold, and residual dye, along with its fine shrinkage pores and flow lines—characteristics of artificial treatment—it can be determined that the sample has undergone artificial treatment. Therefore, this area is judged as an artificially dyed area (e.g., Figures 5 to 6 If the suspected dyeing area contains areas with loose structure, roughness exceeding the threshold, height difference exceeding the threshold, and residual dye, as well as at least one of the artificial treatment characteristics of fine shrinkage pores and flow lines, but not all of them, then the area is determined to be a dyeing undetermined area. If the suspected dyeing area does not contain any of the artificial treatment characteristics of loose structure, roughness exceeding the threshold, height difference exceeding the threshold, residual dye, fine shrinkage pores, and flow lines, then the sample is determined to be black jade.

[0065] It should be noted that Raman spectroscopy tests are conducted using point, line, and surface scanning methods. Dyed jewelry and jade can exhibit Raman spectral characteristic peaks of the dye. To more accurately and quickly determine the cause of the sample's color, the dyeing area identified after testing with a super-depth-of-field microscope and laser confocal microscope is given special attention. This allows for a better analysis of the sample's color changes. Step 3 above includes the following steps:

[0066] Linear extension is performed on the area to be stained, and the parts with color variations on the surface of the area to be stained are connected into a straight line. Continuous line scanning is performed to collect spectra and observe the changes in Raman spectra at different positions along this straight line.

[0067] If the Raman spectrum contains characteristic peaks of the dye, the sample is determined to be dyed black jade; otherwise, the sample is determined to be black jade.

[0068] Line scanning is an effective method for testing Raman spectroscopy, allowing for the analysis of how changes in sample surface color correspond to changes in the Raman spectrum, thus clarifying the cause of the jade sample's color. If the sample is colored by graphite and has not undergone artificial treatment, characteristic graphite peaks will appear at many positions in the Raman spectrum. Black jade exhibits distinct graphite characteristic peaks in its Raman spectrum, while artificially treated, dyed black jade shows virtually no graphite characteristic peaks at different positions in the linear scan. (See [link to documentation]). Figure 7 .

[0069] Example 2

[0070] This embodiment provides an identification device for dyed black jade, used in the aforementioned identification method for dyed black jade. The identification device includes a super depth-of-field microscope, a laser confocal microscope, and a Raman spectrometer arranged sequentially. The super depth-of-field microscope is used to collect the color distribution and structural features of the sample surface and delineate the suspected dyeing area. The laser confocal microscope is used to collect the micromorphological features within the suspected dyeing area and delineate the dyeing to be determined area. The Raman spectrometer is used to collect the Raman spectrum within the dyeing to be determined area and determine whether there are characteristic peaks of dye in the Raman spectrum. If there are, the sample is determined to be dyed black jade; if not, the sample is determined to be black jade.

[0071] Compared with the prior art, the beneficial effects of the identification device for dyed black jade provided in this embodiment are basically the same as those of the identification method for dyed black jade provided in Embodiment 1, and will not be described in detail here.

[0072] Considering the need for continuous adjustment of sample angle during testing in ultra-depth-of-field microscopy and laser confocal microscopy, existing technologies typically involve manual adjustment of jade during identification. However, contaminants such as grease from hands can affect the jade, and the sample needs to be wiped after adjustment. To address these issues, this embodiment provides a sample stage, see [link to relevant documentation]. Figure 8 The structure of this sample stage is completely different from existing sample stage structures. Specifically, it includes a sample holder, a transverse support 1, a longitudinal support 2, and a transverse platform 3. The sample holder is rotatably connected to the transverse support 1 and can rotate around the axis of the transverse support 1. The transverse support 1 is slidably connected to the longitudinal support 2, and the longitudinal support 2 is slidably connected to the transverse platform 3. In this way, by rotating the sample holder, the sample can be rotated, thereby identifying areas on the same circumferential surface of the sample. By sliding between the transverse support 1 and the longitudinal support 2, the vertical height of the sample can be adjusted. By sliding between the longitudinal support 2 and the transverse platform 3, the horizontal position of the sample can be adjusted. During the identification process, the operator can achieve multi-angle and multi-position adjustment of the sample by operating the sample stage without touching the sample, thus effectively improving the detection accuracy and simplifying the identification process.

[0073] Specifically, the sample holder structure includes an arc-shaped support plate 4, a support spring 5, and a suction cup 6. The suction cup 6 is located on the inner arc surface of the arc-shaped support plate 4 via the support spring 5. During identification, the suction cup 6 adsorbs the sample.

[0074] In the identification process, in order to improve the installation stability of the sample, for example, there are multiple support springs 5 ​​and suction cups 6. Multiple suction cups 6 simultaneously adsorb the sample. On the one hand, the simultaneous adsorption of the sample by multiple suction cups 6 can improve the installation stability of the sample. On the other hand, in practical applications, the shape of the sample is usually irregular. The sample holder with this structure can adapt to samples of different shapes by compressing them to different degrees with the springs.

[0075] To further improve the installation stability of the sample, the multiple suction cups 6 are divided into a central suction cup located at the center of the arc-shaped support plate 4, an upper suction cup located above the central suction cup, and a lower suction cup located below the central suction cup. When the sample is installed on the suction cup 6, the upper suction cup is stretched to provide an upward pulling force to the sample, and the lower suction cup is compressed to provide a supporting force to the sample. This can effectively overcome the self-weight of the sample and keep it basically in the center position of the arc-shaped support plate 4.

[0076] In order to enable the sample holder and the transverse support 1 to be rotatably connected, the outer arc surface of the arc support plate 4 is rotatably connected to the transverse support 1 through the ball joint structure 7. For example, the ball of the ball joint structure 7 is located on the outer arc surface of the arc support plate 4, and the spherical shell of the ball joint structure 7 is located on the transverse support 1.

[0077] Similarly, in order to enable the transverse support 1 and the longitudinal support 2 to be slidably connected, the transverse support 1 is provided with a bushing 8, which is sleeved on the outer wall of the longitudinal support 2 and slidably connected to the longitudinal support 2.

[0078] In order to ensure that the longitudinal position of the sample does not change during the identification process, a set screw hole is provided on the bushing 8, and the set screw passes through the bushing 8 and is fixedly connected to the longitudinal support 2.

[0079] In addition, in order to enable the longitudinal support 2 and the transverse platform 3 to be slidably connected, a grid groove is provided on the transverse platform 3, and the lower end of the longitudinal support 2 is inserted into the grid groove. The horizontal position of the sample can be adjusted by sliding the longitudinal support 2 in the grid groove.

[0080] In one alternative embodiment, the suction cup 6 adsorbs the sample using vacuum adsorption. Specifically, the sample stage also includes a vacuum pumping line, an adsorption groove is provided at the center of the suction cup 6, an adsorption channel is provided at the bottom of the adsorption groove, and the adsorption channel is connected to the vacuum pumping line.

[0081] Furthermore, a vacuum pump is installed at one end of the vacuum pumping line, and the other end of the vacuum pumping line has multiple sub-channels, each of which is connected to the adsorption channel of a suction cup 6.

[0082] Furthermore, the adsorption surface of the suction cup 6 is a flexible curved surface, which can adapt to different surface shapes of the sample to be tested, thereby improving adsorption stability.

[0083] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for identifying dyed black jade, characterized in that, The process includes the following steps: Step 1: Use a super depth-of-field microscope to collect the color distribution and structural characteristics of the sample surface, and determine whether there are artificially dyed areas or suspected dyed areas on the sample surface. If there are artificially dyed areas, the sample is determined to be dyed black jade. If there are suspected dyed areas, proceed to Step 2. If there are no artificially dyed areas or suspected dyed areas, the sample is determined to be black jade. Step 2: Use a laser confocal microscope to collect the micromorphological characteristics within the suspected dyed areas, and determine whether there are artificially dyed areas or dyed areas to be determined within the suspected dyed areas. If there are artificially dyed areas, the sample is determined to be dyed black jade. If there are dyed areas to be determined, proceed to Step 3. If there are no artificially dyed areas or dyed areas to be determined, the sample is determined to be black jade. Step 3: Use a Raman spectrometer to test and collect the Raman spectrum within the dyed areas to be determined, and determine whether there are characteristic peaks of dye in the Raman spectrum. If there are, the sample is determined to be dyed black jade. If not, the sample is determined to be black jade, thus completing the identification of dyed black jade. Step 1 includes the following steps: Step 11: Place the sample on the sample stage of the ultra-depth-of-field microscope; Step 12: Observe the overall characteristics of the sample to see if there are any suspected dye residues, enrichment phenomena, or structurally distinctive locations. If so, proceed to Step 13; Step 13: Observe and test the locations suspected of having dye residues, enrichment phenomena, or structurally distinctive locations, and obtain 3D images to observe and analyze the color distribution and surface unevenness of the sample, and determine whether the sample has artificially dyed areas or suspected dyed areas; If there is obvious color enrichment in cracks, pits, or particle boundaries, it is determined that the sample has artificially dyed areas, and the sample is dyed black jade; If the color enrichment in cracks, pits, or particle boundaries is not obvious, and the ultra-depth-of-field microscope cannot further observe and accurately measure finer micromorphological features, it is determined that the sample has suspected dyed areas. Step 2 includes the following steps: Step 21: Place the sample on the sample stage of a laser confocal microscope and perform microscopic and three-dimensional morphological analysis on the surface of the suspected dyeing area in white light mode; Step 22: Perform 3D measurement of the surface roughness, height, and steps of the suspected dyeing area in laser mode; Step 23: Based on the morphology, roughness, and height difference of the suspected dyeing area, compare it with black jade. If the suspected dyeing area contains areas with loose structure, roughness exceeding the threshold, height difference exceeding the threshold, and residual dye, shrinkage pores, and flow lines, it is considered a suspected dyeing area. If the sample has been artificially treated, the area is determined to be an artificially dyed area. If the suspected dyed area contains areas with loose structure, roughness exceeding the threshold, height difference exceeding the threshold, and residual dye, shrinkage pores, and flow lines, and has at least one of the artificial treatment characteristics but not all of them, the area is determined to be a dyeing undetermined area. If the suspected dyed area does not contain areas with loose structure, roughness exceeding the threshold, height difference exceeding the threshold, and residual dye, shrinkage pores, and flow lines, and has no artificial treatment characteristics, the sample is determined to be black jade.

2. The method for identifying dyed black jade according to claim 1, characterized in that, The sample stage includes a sample holder, a transverse support, a longitudinal support, and a transverse platform. The sample holder is rotatably connected to the transverse support and can rotate about the axis of the transverse support. The transverse support is slidably connected to the longitudinal support, and the longitudinal support is slidably connected to the transverse platform. The sample holder includes an arc-shaped support plate, a support spring, and a suction cup. The suction cup is located on the inner arc surface of the arc-shaped support plate through the support spring. During identification, the suction cup adsorbs the sample. The multiple suction cups are divided into a central suction cup located at the center of the arc-shaped support plate, an upper suction cup located above the central suction cup, and a lower suction cup located below the central suction cup. When the sample is mounted on the suction cup, the upper suction cup is stretched and the lower suction cup is compressed.

3. The method for identifying dyed black jade according to claim 2, characterized in that, In step 12, the magnification of the ultra-depth-of-field microscope is 20 to 100 times.

4. The method for identifying dyed black jade according to claim 2, characterized in that, In step 13, the magnification of the ultra-depth-of-field microscope is 100 to 200 times.

5. The method for identifying dyed black jade according to claim 1, characterized in that, In step 21, the magnification of the laser confocal microscope is 50 to 500 times.

6. The method for identifying dyed black jade according to claim 1, characterized in that, Step 3 includes the following steps: Linear extension is performed on the area to be stained, and the parts with color variations on the surface of the area to be stained are connected into a straight line. Continuous line scanning is performed to collect spectra and observe the changes in Raman spectra at different positions along this straight line. If the Raman spectrum contains characteristic peaks of the dye, the sample is determined to be dyed black jade; otherwise, the sample is determined to be black jade.

Images