CN108195802B - Diamond luminescence imaging detection method - Google Patents
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- CN108195802B CN108195802B CN201711162022.8A CN201711162022A CN108195802B CN 108195802 B CN108195802 B CN 108195802B CN 201711162022 A CN201711162022 A CN 201711162022A CN 108195802 B CN108195802 B CN 108195802B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6402—Atomic fluorescence; Laser induced fluorescence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
- G01N21/6456—Spatial resolved fluorescence measurements; Imaging
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Abstract
The invention discloses a diamond luminescence imaging detection method, which comprises the steps of starting a light source, irradiating exciting light emitted by the light source onto a sample to be detected, and enabling the sample to fluoresce; turning off the light source, and allowing the sample to phosphoresce; in the process of repeatedly switching on and off the high frequency or covering the light source, the imaging module continuously acquires real-time image frames, and in each period of switching on and off or covering the exciting light, the corresponding image frames are phosphorescent images when the exciting light is not emitted; cutting the phosphorescence image without excitation light in each period to a window for playing so as to obtain phosphorescence real-time video; and the authenticity of the diamond is judged in real time through phosphorescence by observing the phosphorescence real-time video or phosphorescence image played by the display module. The application has the advantages of high detection speed, low cost, easy operation, and capability of quickly discriminating the abnormal diamond, is suitable for batch detection and diamonds inlaid on a ring, discriminates the abnormal diamond in real time, and determines the specific position of the abnormal diamond on the ring.
Description
Technical Field
The invention relates to the field of diamond detection equipment, in particular to a diamond luminescence imaging detection method.
Background
Diamonds fluoresce under excitation by ultraviolet light. Some diamonds fluoresce, typically bluish white, and a small proportion yellow.
Diamond is fluorescent and some may also be phosphorescent. When exposed to uv light, diamonds emit blue visible light of different intensities, which is fluorescence, and when the uv light source is removed, diamonds still emit visible light, which is phosphorescence.
The most simple method is to use the diamonds to be identified primarily by the ultraviolet lamp, if the fluorescence intensity and color are different, the diamonds are true diamonds, and if the color intensity is uniform, the diamonds are likely to be imitations of diamonds.
At present, illegal vendors mix artificial diamonds in natural diamonds, the detection speed of the traditional detection method is slow, the artificial diamonds are not beneficial to being rapidly screened from the natural diamonds, and meanwhile, the existing equipment and the detection method are generally used for detecting large-particle diamonds and lack of rapid detection means for broken diamonds. The garrulous brill quantity of purchase of buyer is many usually, adopts traditional means to detect that the task is heavy, and it is with high costs to bore the detection to garrulous simultaneously, and detection efficiency is low, is unfavorable for very much reducing the risk of purchasing false diamond.
In the existing method for recording the phosphorescence distribution by photographing, in order to improve the efficiency, broken diamonds are generally adopted to spread out and photograph in a large area, and because the irradiation area of irradiation light is large, a long irradiation time is needed for photographing once; when a single diamond needs to be analyzed in a picture, the picture resolution of the single diamond is low, and the requirement cannot be met. Meanwhile, only a single-position phosphorescence image can be obtained, and the three-dimensional phosphorescence image is not suitable for a three-dimensional distribution sample (for example, a diamond ring embedded with a plurality of broken diamonds).
The conventional method for photographing and recording phosphorescence under small-area illumination needs to photograph once by manual pressing once, and can determine whether a sample is photographed or not after the photographing is finished. Because the detection sample is usually very small, if a fixed mode is adopted, the detection sample is fixed at a specified position every time, and the operation efficiency is very low. If a manual mode is adopted, the detection can be started after the alignment is determined by photographing or other modes every time, and if the alignment deviates from a measuring area in the rotating process, a blank picture is photographed, so that the actual operation difficulty is greatly increased. If the diamond ring with a plurality of pieces of broken diamonds is measured, a great deal of time is needed.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a diamond luminescence imaging detection method which is efficient, easy to operate and capable of rapidly discriminating diamonds.
In order to realize the technical purpose, the scheme of the invention is as follows: a diamond luminescence imaging detection method comprises a light source, an imaging module and a display module, and specifically comprises the following steps:
the method comprises the following steps that firstly, a light source is started, exciting light emitted by the light source irradiates a sample to be detected, and the sample fluoresces; turning off the light source, and allowing the sample to phosphoresce; in the process of repeatedly switching on and off the high frequency or covering the light source, the imaging module continuously acquires real-time image frames, and in each period of switching on and off or covering the exciting light, the corresponding image frames are phosphorescent images when the exciting light is not emitted;
secondly, cutting the phosphorescence image without excitation light in each period to a window for playing so as to obtain phosphorescence real-time video;
and thirdly, real-time judgment of the authenticity of the diamond is carried out through the existence or nonexistence of phosphorescence or color by observing the phosphorescence real-time video or phosphorescence image played by the display module.
Preferably, in the first step, in each period of switching or shielding the excitation light, the corresponding image frame when the excitation light is irradiated is a fluorescence image;
in the second step, the fluorescent image irradiated to the excitation light in each period is cut to a window for playing, and then a fluorescent real-time video is obtained;
and in the third step, the position of the sample to be detected is observed in real time through the excitation light and the fluorescence by observing the fluorescence real-time video or the fluorescence image played by the display module.
Preferably, in the first step, in each period of switching or covering the excitation light, the visible light emitted in a pulse mode is added when the excitation light is turned off, so that a visible light video can be obtained, and the position of the sample to be detected can be observed in real time through the visible light video.
Preferably, the light source is a pulsed light source.
Preferably, a chopper is disposed at a front end of the light source, and the chopper controls the excitation light emitted from the light source to be repeatedly covered or conducted.
Preferably, in the second step, the phosphorescence image when no excitation light exists in each period is extracted, the fluorescence image with position information in the same period is extracted, the whole to-be-detected sample illuminated by the excitation light and the fluorescence is used as a background through post-processing, the background is superposed with the phosphorescence luminous part, and finally the fluorescence positioning phosphorescence real-time video is obtained.
Preferably, in the second step, the phosphorescence image when no excitation light exists in each period is extracted, the visible light image with the position information in the same period is extracted, the whole sample to be detected illuminated by the visible light is used as a background through post-processing, the background is superposed with the phosphorescence luminous part, and finally the visible light positioning phosphorescence real-time video is obtained.
Preferably, in the third step, the diamond emits fluorescence, and the fluorescence color is non-blue-white, so that the diamond is defined as abnormal diamond.
Preferably, in the third step, the diamond emits phosphorescence, and the phosphorescence color is blue green, so that the diamond is defined as synthetic diamond; the phosphorescent color is any other color, and the diamond is defined as an abnormal diamond.
Preferably, in the first step, in the process of shooting the sample to be detected in real time by the imaging module, the sample to be detected can rotate or move in real time;
by observing the obtained fluorescent real-time video, whether the sample to be detected is at the observation position or not can be confirmed, and the observation angle of the sample to be detected can be confirmed;
and when the position or the angle is not appropriate, returning to the first step to move or rotate the sample to be detected to the appropriate position or angle in real time.
The method has the advantages that the fluorescent real-time video and the phosphorescent real-time video are obtained by editing the videos, manual pressing for photographing is not needed, continuous shooting and recording are automatically carried out, real-time examination can be carried out on diamonds on the sample by observing the phosphorescent real-time video, and the specific positions of abnormal diamonds on the sample to be detected are confirmed by the aid of fluorescent real-time images; meanwhile, the position of the sample to be detected can be timely adjusted by observing the fluorescence real-time image, so that the sample to be detected can be shot in the shooting area of the imaging module; the application has the advantages of high detection speed, low cost, easy operation, and capability of quickly discriminating the abnormal diamond, is suitable for batch detection and diamonds inlaid on a ring, discriminates the abnormal diamond in real time, and determines the specific position of the abnormal diamond on the ring.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The specific embodiment of the invention is a diamond luminescence imaging detection method, which comprises a light source, an imaging module and a display module, and comprises the following specific steps:
the method comprises the following steps that firstly, a light source is started, exciting light emitted by the light source passes through an optical filter and then irradiates a sample to be detected, and the sample fluoresces; turning off the light source, and allowing the sample to phosphoresce; in the process of repeatedly switching on and off the high frequency or covering the light source, the imaging module continuously acquires real-time image frames, and in each period of switching on and off or covering the exciting light, the corresponding image frames are phosphorescent images when the exciting light is not emitted. Because the sample to be detected is provided with one or more diamonds, the position or the rotation angle of the sample to be detected can be adjusted in real time in the process of obtaining the image frame, and the phosphorescence image and the fluorescence image of different positions of a single diamond can be detected, or the phosphorescence image and the fluorescence image of a plurality of diamonds can be respectively and continuously detected. If the light source is a single wavelength or simple composite light source, the sample can be directly irradiated; if the light source is complex composite light, a filter is generally additionally arranged between the light source and the sample, and excitation light with a specific waveband can be obtained through the filter.
Secondly, cutting the phosphorescence image without excitation light in each period to a window for playing so as to obtain phosphorescence real-time video;
and thirdly, real-time judgment of the authenticity of the diamond is carried out through the existence or nonexistence of phosphorescence or color by observing the phosphorescence real-time video or phosphorescence image played by the display module.
In order to obtain the real-time position of the abnormal diamond, in the first step, in each period of switching or covering the exciting light, the corresponding image frame when the exciting light is irradiated is a fluorescence image;
in the second step, the fluorescent image irradiated to the excitation light in each period is cut to a window for playing, and then a fluorescent real-time video is obtained;
and in the third step, the position of the sample to be detected is observed in real time through the excitation light and the fluorescence by observing the fluorescence real-time video or the fluorescence image played by the display module. The phosphorescent light is very weak, so that the surrounding environment cannot be photographed sometimes, other images are required to be positioned, a fluorescence image is collected in each period, the fluorescence image is provided with excitation light and fluorescence in the shooting process, the surrounding environment is relatively clear, the alignment operation can be accurately carried out, the sample is aligned to the imaging module, and meanwhile the specific position and angle of the abnormal diamond relative to the sample to be measured are determined.
In order to more accurately acquire the accurate real-time position of the abnormal diamond, in the first step, in each period of switching or covering the exciting light, the visible light emitted in a pulse mode is added when the exciting light is turned off, so that a visible light video can be obtained, and the position of the sample to be detected can be observed in real time through the visible light video. Because phosphorescence is very weak, if a sample to be detected has a plurality of diamonds, the position of the diamond on the sample cannot be accurately known through video recording; and when the light of fluorescence and exciting light are weak in part, the adoption of fluorescence image positioning is quite unclear, and the visible light emitted in a pulse mode is introduced at the moment, so that a clear and bright real-time visible light image of the sample to be detected can be obtained, and the specific position and angle of the abnormal diamond relative to the sample to be detected can be accurately determined.
In order to better obtain the pulse type repeated switching effect, the light source is a pulse light source. The front end of the light source is provided with a light chopper, and exciting light emitted by the light source is controlled to be repeatedly covered or conducted through the light chopper. The two modes can obtain stable high-frequency repeated switching or covering effect, and further realize the switching of irradiation or non-irradiation of the excitation light, so that a fluorescence image and a phosphorescence image are obtained.
In order to observe the position of the abnormal diamond more intuitively, in the second step, a phosphorescence image without excitation light in each period is extracted, a fluorescence image with position information in the same period is extracted, the whole to-be-detected sample illuminated by the excitation light and the fluorescence is used as a background through post-processing, the background is superposed with a phosphorescence luminous part, and finally, a fluorescence positioning phosphorescence real-time video is obtained. For example, a diamond ring full of a circle of broken diamonds can be seen through fluorescent positioning phosphorescence and real-time video recording to show the specific position and angle of the phosphorescent diamonds on the diamond ring.
In order to observe the position of the abnormal diamond more intuitively, in the second step, a phosphorescence image without excitation light in each period is extracted, a visible light image with position information in the same period is extracted, the whole to-be-detected sample illuminated by visible light is used as a background through post-processing, the background is superposed with a phosphorescence luminous part, and finally, a visible light positioning phosphorescence real-time video is obtained. Because phosphorescence is very weak, the position of the phosphorescence can not be accurately judged, and sometimes the intensity of fluorescence and excitation light is not enough, the auxiliary positioning needs to be carried out through a strong visible light image.
In order to better distinguish abnormal diamonds, in the third step, the diamonds emit fluorescence, and the fluorescence color is non-blue-white, so that the diamonds are defined as abnormal diamonds;
the diamond emits phosphorescence, and the phosphorescence color is blue green, so that the diamond is defined as synthetic diamond; the phosphorescent color is any other color, and the diamond is defined as an abnormal diamond. According to the fact that whether fluorescence and phosphorescence exist or the colors of the diamonds are different, rapid preliminary screening can be conducted, and the diamonds can be classified, so that more accurate screening or detection can be conducted in the later period conveniently. After the distinguishing and classifying are completed, the abnormal diamonds can be further detected independently in a targeted manner when being suspected.
In order to facilitate a user to observe the position corresponding to the phosphorescent image in real time, in the second step, the phosphorescent image without exciting light in each period is extracted, a fluorescent image or a visible light image with position information in the same period is extracted, and the real-time video of the phosphorescent position is finally obtained through post-processing.
In order to facilitate rapid detection, in the first step, the imaging module can rotate or move in real time in the process of shooting a sample to be detected in real time;
by observing the obtained fluorescent real-time video, whether the sample to be detected is at the observation position or not can be confirmed, and the observation angle of the sample to be detected can be confirmed;
and when the position or the angle is not appropriate, returning to the first step to move or rotate the sample to be detected to the appropriate position or angle in real time. In actual operation, current equipment can only be fixed and observe in a certain position usually, can't remove in real time or rotate, if the angular difference of position deviation or the diamond that needs to observe is not right, can adjust after the completion need shoot, and a plurality of diamonds of inlaying need detect one by one by one on the ring in addition, and efficiency is very low. This application can rotate or remove the sample that awaits measuring in the testing process, adjusts in real time through the real-time video recording of fluorescence, no matter be one or more diamond on the plane, still inlay all can once only accomplish in succession the detection of many lithodomous rings.
The example I is that a circle of twenty diamond rings are embedded, during detection, a light source is started, the light source is repeatedly switched on and off at high frequency or covered, and a fluorescent real-time video played by a display module is observed. After alignment, the ring starts to rotate slowly, at the moment, the imaging module automatically captures a fluorescence image and a phosphorescence image of each period, and continuously plays continuous fluorescence real-time video and phosphorescence real-time video on the display module, a user only needs to observe the phosphorescence real-time video of each diamond on the ring one by one without operation shooting, searches for abnormal diamonds emitting phosphorescence, and can continuously detect twenty diamonds completely distributed on the curved surface at one time; when a certain diamond emits phosphorescence, the rotation is stopped, an operator can mark video recording time in real time, record the characteristics of the abnormal diamond, then perform manual analysis and discussion, accurately position the abnormal diamond on the ring in the fluorescent real-time video recording, and quickly detect the abnormal diamond mixed in a plurality of inlaid diamonds. Because continuous shooting and recording are carried out, the diamond ring also rotates, the fluorescence real-time video recording can obtain the phosphorescence of the same diamond at different angles, and the intensity and the color of the phosphorescence are slightly different due to different angles, so that an operator can obtain more diamond information to carry out comprehensive judgment.
The traditional method can not quickly and accurately detect a plurality of inlaid diamonds (a plurality of diamonds positioned at different position angles), the application adopts video editing to obtain fluorescent real-time video and phosphorescent real-time video, does not need to manually press for taking a picture, automatically carries out continuous video recording, does not need to manually control for taking a picture, is simpler and more convenient to operate, can carry out real-time investigation on diamonds on a sample by observing the phosphorescent real-time video, and is assisted with a fluorescent real-time image to confirm the specific position of an abnormal diamond on the sample to be detected; meanwhile, the position of the sample to be detected can be timely adjusted by observing the fluorescence real-time image, so that the sample to be detected can be shot in the shooting area of the imaging module; the application has the advantages of high detection speed, low cost, easy operation, and capability of quickly discriminating the abnormal diamond, is suitable for batch detection and diamonds inlaid on the ring, and can discriminate the abnormal diamond in real time and determine the specific position of the abnormal diamond on the ring.
The abnormal diamond is inspected in real time, the judgment is completed immediately, the position of the abnormal diamond does not need to be located after complete detection is completed, and the phosphorescence image does not need to be measured again after the exciting light is turned off for judgment; and because phosphorescence luminous time is short, and it is weak to give out light, the phosphorescence picture resolution ratio that the small region of this application was shone and is obtained is high, and high definition phosphorescence picture constitutes phosphorescence real-time video moreover, and the user can more directly perceived accurate judgement, reduces the erroneous judgement probability.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any minor modifications, equivalent replacements and improvements made to the above embodiment according to the technical spirit of the present invention should be included in the protection scope of the technical solution of the present invention.
Claims (8)
1. A method for detecting the luminescence imaging of diamond is characterized in that: the method comprises a light source, an imaging module and a display module, and specifically comprises the following steps:
the method comprises the following steps that firstly, a light source is started, exciting light emitted by the light source irradiates a sample to be detected, and the sample fluoresces; turning off the light source, and allowing the sample to phosphoresce; in the process of repeatedly switching on and off the high frequency or covering the light source, the imaging module continuously acquires real-time image frames, and in each period of switching on and off or covering the exciting light, the corresponding image frames are phosphorescent images when the exciting light is not emitted;
secondly, cutting the phosphorescence image without excitation light in each period to a window for playing so as to obtain phosphorescence real-time video;
thirdly, real-time judgment is carried out on the authenticity of the diamond through the existence or nonexistence of phosphorescence or color by observing the phosphorescence real-time video or phosphorescence images played by the display module;
in the first step, in each period of switching or covering exciting light, a corresponding image frame when the exciting light is irradiated is a fluorescence image;
in the second step, the fluorescent image irradiated to the excitation light in each period is cut to a window for playing, and then a fluorescent real-time video is obtained;
in the third step, the position of the sample to be detected is observed in real time through the excitation light and the fluorescence by observing the fluorescence real-time video or the fluorescence image played by the display module;
in the first step, the imaging module can rotate or move the sample to be detected in real time in the process of shooting the sample to be detected in real time;
the observation of the obtained fluorescent real-time video can confirm whether the sample to be detected is at the observation position and confirm the observation angle of the sample to be detected;
and when the position or the angle is not appropriate, returning to the first step to move or rotate the sample to be detected to the appropriate position or angle in real time.
2. The method of claim 1, wherein said method comprises: in the first step, in each period of switching or covering the exciting light, the visible light emitted in a pulse mode is added when the exciting light is turned off, so that a visible light video can be obtained, and the position of the sample to be detected can be observed in real time through the visible light video.
3. The method of claim 1, wherein said method comprises: the light source is a pulse light source.
4. The method of claim 1, wherein said method comprises: the front end of the light source is provided with a light chopper, and exciting light emitted by the light source is controlled to be repeatedly covered or conducted through the light chopper.
5. The method of claim 1, wherein said method comprises: and in the second step, extracting the phosphorescence image when no excitation light exists in each period, extracting the fluorescence image with the position information in the same period, and performing post-processing to use the whole to-be-detected sample illuminated by the excitation light and the fluorescence as a background which is superposed with the phosphorescence luminous part to finally obtain the fluorescence positioning phosphorescence real-time video.
6. A method for diamond luminescence imaging detection as claimed in claim 2, wherein: and in the second step, extracting the phosphorescence image when no excitation light exists in each period, extracting the visible light image with position information in the same period, and performing post-processing to use the whole sample to be detected illuminated by the visible light as a background which is superposed with the phosphorescence luminous part to finally obtain the visible light positioning phosphorescence real-time video.
7. The method of claim 1, wherein said method comprises: and in the third step, the diamond emits fluorescence, and the fluorescence color is non-blue-white, so that the diamond is defined as abnormal diamond.
8. The method of claim 1, wherein said method comprises: in the third step, the diamond emits phosphorescence, and the phosphorescence color is blue green, so that the diamond is defined as synthetic diamond; the phosphorescent color is any other color, and the diamond is defined as an abnormal diamond.
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| CN109580574A (en) * | 2019-01-21 | 2019-04-05 | 国检中心深圳珠宝检验实验室有限公司 | A kind of ruby fluorescence detection system and its ruby fluorescence detection method |
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