An apparatus for colour grading of rough diamond blanks

Abstract

The utility model discloses a kind of original diamond rough color grading equipment, belong to CVD artificial synthesis diamond field. Including: light source, incident light transmission medium, collimating mirror, integrating sphere, emergent light transmission medium, optical analysis instrument, control host computer, one end of incident light transmission medium is connected with light source, collimating mirror is connected at the other end, the one end of collimating mirror away from incident light transmission medium corresponds with the position of integrating sphere, one end of emergent light transmission medium is connected with integrating sphere, and the other end is connected with optical analysis instrument, optical analysis instrument is connected with control host computer. Compared with prior art, the present application can simplify optical path, facilitate debugging, operation, facilitate to realize batch testing;Also can make the sample more sufficient to the absorption of light, reduce light leakage, the color parameter collected is more stable, and the accuracy of color grading is higher.

Description

Technical Field

[0001] This utility model belongs to the field of CVD synthetic diamond, and specifically relates to a color grading device for raw diamond blanks. Background Technology

[0002] The color of lab-grown gem-quality diamonds is highly critical. During the cultivation process, the growth environment is controlled, thus influencing the color quality of the finished diamond rough. The color requirements for lab-grown diamonds are consistent with those for natural diamonds. To assess quality, the color of the diamond rough needs to be graded. This grading involves several levels within a color range that is difficult for the human eye to distinguish, placing high demands on both the human eye and standard samples. When using selected or calibrated color comparison stones or rough samples for color grading, the process relies heavily on human visual perception and experience, resulting in a wide and unstable range of color grades and low grading efficiency.

[0003] It is important to emphasize that for CVD-grown gem-quality diamonds, color grading is generally performed before color treatment (high-temperature and high-pressure treatment of the raw diamond blank to lighten its color), further increasing the difficulty and uncertainty of color grading. Existing color grading equipment typically uses UV-Vis spectrophotometers and gem UV-Vis fiber optic spectrometers to measure the color parameters of samples. These devices are structurally complex and difficult to operate. Furthermore, these devices generally have stringent requirements for the sample's condition, such as requiring the sample to be a finished, cut diamond with a standard cut. Otherwise, the machine grading results will have significant errors, extremely narrow applicability, unstable sample color parameters, low reproducibility, and are unsuitable for precise quantitative color analysis of diamond blanks or for industrial-scale batch testing of the color of raw diamond blanks. Utility Model Content

[0004] To address the aforementioned problems, the primary objective of this invention is to provide a color grading device for raw diamond blanks that simplifies the optical path, facilitates debugging and operation, and enables batch testing.

[0005] Another objective of this invention is to provide a color grading device for raw diamond blanks, which allows for more complete absorption of light by the sample, resulting in more stable color parameters and higher accuracy in color grading.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] This utility model provides a color grading device for raw diamond blanks, comprising:

[0008] A light source used to provide light.

[0009] Incident light transmission medium used to transmit incident light;

[0010] Collimating lens used to focus light and direct it onto the sample;

[0011] An integrating sphere used to receive the light emitted from the sample;

[0012] Outgoing light transmission medium used to conduct outgoing light;

[0013] Optical analysis instruments used for receiving and processing optical signals;

[0014] A control host used in conjunction with optical analysis instruments to perform color grading of light signals;

[0015] One end of the incident light transmission medium is connected to the light source, and the other end is connected to a collimating lens. The end of the collimating lens facing away from the incident light transmission medium corresponds to the position of the integrating sphere. One end of the outgoing light transmission medium is connected to the integrating sphere, and the other end is connected to an optical analysis instrument. The optical analysis instrument is connected to the control host.

[0016] Furthermore, the light source includes one of a halogen lamp or a xenon lamp.

[0017] Furthermore, both the incident light transmission medium and the outgoing light transmission medium are made of quartz optical fiber, with an optical flux range of 200-1100nm. The quartz optical fiber is connected to the light source, collimating lens, integrating sphere, and optical analysis instrument via an SMA905 connector.

[0018] Furthermore, the collimating lens is a fiber optic collimating lens, which can focus the light beam in the quartz fiber into a beam with a diameter of 5mm, with small divergence, which is beneficial for the straight propagation of the beam in the sample.

[0019] Furthermore, the optical analysis instrument includes a spectrometer, which is equipped with a host interface and connected to a control host through the host interface. The processing range of the spectrometer is 350nm-1050nm wavelength. The control host is equipped with optical analysis software that can work with the spectrometer. After receiving the light signal, the spectrometer processes it and then collects the color parameters of the light signal through the optical analysis software. The light signal is then classified according to the color parameters.

[0020] Furthermore, the sample is placed on the integrating sphere.

[0021] Furthermore, the color grading device also includes a base on which the integrating sphere is placed.

[0022] Furthermore, the color grading device also includes an adjustable bracket for adjusting the height of the fiber optic collimator. The adjustable bracket is mounted on the base, and the fiber optic collimator is mounted on the adjustable bracket. The adjustable bracket can adjust the height of the incident quartz fiber and the fiber optic collimator, thereby adjusting the distance between the fiber optic collimator and the integrating sphere. This allows samples of different heights to maintain a reasonable distance from the fiber optic collimator, resulting in more complete light absorption by samples closely attached to the integrating sphere.

[0023] Furthermore, the adjustable bracket includes a support rod, a lifting seat, and a mounting platform. The lower end of the support rod is fixed to the base, the lifting seat is movably connected to the support rod, the mounting platform is fixed to the lifting seat, and the fiber optic collimator is mounted on the mounting platform. The lifting seat is movably connected to the support rod via a threaded connection or other means, allowing it to be raised and lowered to adjust the height of the mounting platform, thereby adjusting the height of the fiber optic collimator. Holes can be provided on the mounting platform to securely mount the fiber optic collimator, ensuring that the lower end of the fiber optic collimator is directly aligned with the sample on the integrating sphere.

[0024] The beneficial effects of this invention are as follows: Compared with the prior art, in this application, the light emitted from the light source is transmitted through the incident light transmission medium to the collimating lens, focused into a beam, and then enters the sample in a straight line. From the sample, it enters the integrating sphere, where it is received without gaps. This greatly reduces the beam divergence effect at the sample material interface. The fully absorbed light is homogenized by the integrating sphere before entering the spectrometer for processing. Finally, it is converted by software on the control host to acquire the color parameters of the diamond blank, which are then graded. This design simplifies the optical path, facilitates debugging and operation, and enables batch testing. It also allows for more complete light absorption by the sample, reduces light leakage, and results in more stable color parameters and higher accuracy in color grading. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the color grading equipment.

[0026] Figure 2 This is an exploded view of a color grading device.

[0027] In the diagram: 1. Base; 2. Incident light transmission medium; 3. Fiber optic collimator; 4. Integrating sphere; 5. Outgoing light transmission medium; 6. Spectrometer; 7. Main unit interface; 8. Adjustable bracket; 81. Support rod; 82. Lifting seat; 83. Mounting platform. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] To achieve the above objectives, the technical solution of this utility model is as follows:

[0030] See Figure 1-2 As shown, this embodiment provides a color grading device for raw diamond blanks, including:

[0031] Base 1;

[0032] A light source used to provide light.

[0033] Incident light transmission medium 2 used to transmit incident light;

[0034] A collimating lens used to focus light onto the sample; the collimating lens is a fiber optic collimating lens 3.

[0035] Integrating sphere 4 is used to receive the light emitted from the sample;

[0036] 5. Outgoing light transmission medium used to conduct outgoing light;

[0037] An optical analysis instrument used for receiving and processing optical signals; the optical analysis instrument uses a spectrometer 6.

[0038] A control host used in conjunction with optical analysis instruments to perform color grading of light signals;

[0039] One end of the incident light transmission medium 2 is connected to the light source, and the other end is connected to the collimating lens. The end of the fiber collimating lens 3 facing away from the incident light transmission medium 2 corresponds to the position of the integrating sphere 4. One end of the outgoing light transmission medium 5 is connected to the integrating sphere 4, and the other end is connected to the optical analysis instrument. The optical analysis instrument is connected to the control host. The integrating sphere 4 is mounted on the base 1.

[0040] Furthermore, both the incident light transmission medium 2 and the outgoing light transmission medium 5 are made of quartz optical fiber, with an optical flux range of 200-1100nm. They are connected to the light source, collimating lens, integrating sphere 4, and optical analysis instruments via SMA905 connectors.

[0041] In this application, the sample is positioned between the fiber optic collimating lens 3 and the integrating sphere 4, placed on the integrating sphere 4. Light emitted from the light source is transmitted through a quartz fiber to the fiber optic collimating lens 3, which focuses the light beam in the quartz fiber into a 5mm diameter beam with minimal divergence. The beam enters the sample in a straight line, utilizing the linear propagation of the beam within the sample. Then, it enters the integrating sphere 4, where it receives the light without any gaps, greatly reducing the divergence effect at the sample material interface. The fully absorbed light is homogenized by the integrating sphere 4 and then passes through the quartz fiber to the spectrometer 6 for processing. Finally, the light is converted by software on the control host to acquire the color parameters of the diamond blank, which are then graded. This setup simplifies the optical path, facilitates debugging and operation, and enables batch testing. It also ensures more complete light absorption by the sample, reduces light leakage, and results in more stable color parameters and higher accuracy in color grading.

[0042] Furthermore, the light source includes one of a halogen lamp or a xenon lamp.

[0043] Furthermore, the optical analysis instrument is a spectrometer 6, which is equipped with a host interface 7 and is connected to a control host through the host interface 7. The processing range of the spectrometer 6 is 350nm-1050nm wavelength. The control host is equipped with optical analysis software that can work with the spectrometer 6. After receiving the light signal, the spectrometer 6 processes it and then collects the color parameters of the light signal through the optical analysis software. The light signal is then classified according to the color parameters.

[0044] Furthermore, the color grading device also includes an adjustable bracket 8 for adjusting the height of the fiber optic collimator 3. The adjustable bracket 8 is mounted on the base 1, and the fiber optic collimator 3 is mounted on the adjustable bracket 8. The adjustable bracket 8 can adjust the height of the incident quartz fiber and the fiber optic collimator 3, thereby adjusting the distance between the fiber optic collimator 3 and the integrating sphere 4. This allows samples of different heights to maintain a reasonable distance from the fiber optic collimator 3, resulting in more complete light absorption by the sample close to the integrating sphere 4.

[0045] Furthermore, the adjustable bracket 8 includes a support rod 81, a lifting seat 82, and a mounting platform 83. The lower end of the support rod 81 is fixed to the base 1. The lifting seat 82 is movably connected to the support rod 81. The mounting platform 83 is fixed to the lifting seat 82, and the fiber optic collimator 3 is mounted on the mounting platform 83. The lifting seat 82 is movably connected to the support rod 81 by means of threaded connection or other means, and can be raised and lowered to adjust the height of the mounting platform 83, thereby adjusting the height of the fiber optic collimator 3. Holes can be provided on the mounting platform 83 to fix the fiber optic collimator 3, so that the lower end of the fiber optic collimator 3 can be directly facing the sample on the integrating sphere 4.

[0046] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A color grading device for raw diamond blanks, characterized in that, include: A light source used to provide light. Incident light transmission medium used to transmit incident light; Collimating lens used to focus light and direct it onto the sample; An integrating sphere used to receive the light emitted from the sample; Outgoing light transmission medium used to conduct outgoing light; Optical analysis instruments used for receiving and processing optical signals; A control host used in conjunction with optical analysis instruments to perform color grading of light signals; One end of the incident light transmission medium is connected to the light source, and the other end is connected to a collimating lens. The end of the collimating lens facing away from the incident light transmission medium corresponds to the position of the integrating sphere. One end of the outgoing light transmission medium is connected to the integrating sphere, and the other end is connected to an optical analysis instrument. The optical analysis instrument is connected to the control host.

2. The color grading equipment for raw diamond blanks as described in claim 1, characterized in that, The light source includes halogen lamps and xenon lamps.

3. The color grading equipment for raw diamond blanks as described in claim 1, characterized in that, Both the incident light transmission medium and the outgoing light transmission medium are made of quartz optical fiber, and the optical flux range of the quartz optical fiber is 200-1100nm.

4. The color grading equipment for raw diamond blanks as described in claim 3, characterized in that, The collimating lens is a fiber optic collimating lens, which can focus the light beam in the quartz fiber into a beam with a diameter of 5mm.

5. The color grading equipment for raw diamond blanks as described in claim 1, characterized in that, The optical analysis instrument includes a spectrometer, which is equipped with a host interface and is connected to a control host through the host interface.

6. The color grading equipment for raw diamond blanks as described in claim 1, characterized in that, The sample is placed on the integrating sphere.

7. The color grading equipment for raw diamond blanks as described in claim 4, characterized in that, The color grading device also includes a base on which the integrating sphere is placed.

8. The color grading equipment for raw diamond blanks as described in claim 7, characterized in that, The color grading device also includes an adjustable bracket for adjusting the height of the fiber optic collimator, the adjustable bracket being mounted on the base, and the fiber optic collimator being mounted on the adjustable bracket.

9. The color grading equipment for raw diamond blanks as described in claim 8, characterized in that, The adjustable bracket includes a support rod, a lifting seat, and a mounting platform. The lower end of the support rod is fixed to the base. The lifting seat is movably connected to the support rod. The mounting platform is fixed to the lifting seat. The fiber optic collimator is mounted on the mounting platform.

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