CN111366545A - Handheld dual-waveband common-path optical tomography imaging system - Google Patents
Handheld dual-waveband common-path optical tomography imaging system Download PDFInfo
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- CN111366545A CN111366545A CN202010273081.8A CN202010273081A CN111366545A CN 111366545 A CN111366545 A CN 111366545A CN 202010273081 A CN202010273081 A CN 202010273081A CN 111366545 A CN111366545 A CN 111366545A
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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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems
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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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
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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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
Abstract
The invention relates to a hand-held dual-waveband common-path optical tomography imaging system, which comprises: the first waveband tomography module comprises a broadband light source, a first circulator and a spectrometer; the second wave band tomography module comprises a sweep frequency light source, a second circulator, a coupler and a detector; the sample scanning handle comprises a first collimator, a second collimator, a dichroic mirror, a wave-splitting front mirror, a reflecting mirror, an off-axis parabolic mirror and a two-dimensional MEMS vibrating mirror. The invention adopts the OCT system design of 'dual-waveband + common path + wave division front', so that the system takes into account two aspects of high resolution and large imaging depth, the waveband range is richer, the problems of dispersion mismatching and polarization mismatching are effectively avoided, simultaneously, the splitting ratio of the reference light and the sample light is continuously adjustable, the signal-to-noise ratio of the system is further optimized, the utilization efficiency of the light source light is greatly improved, and the material evidence detection with lossless, in-situ, high resolution and large imaging depth is favorably realized.
Description
Technical Field
The invention relates to a handheld dual-waveband common-path optical tomography imaging system, and relates to the technical field of optical imaging.
Background
Optical Coherence Tomography (OCT) is a three-dimensional high-resolution tomographic imaging technique that was first applied in the biomedical field. In recent years, by virtue of the characteristics of in-situ, nondestructive, rapid, high-resolution and tomographic imaging, the OCT technology gradually obtains many new applications in the field of forensic science, such as application to automobile paint inspection, adhesive tape inspection, latent fingerprint visualization and the like. OCT is a novel forensic science image technology with great application prospect, because the OCT can acquire characteristic information such as deep-level structures, spectrums and the like in material evidence without any pretreatment on samples.
The conventional OCT scanning system usually adopts a single wavelength band, for example, a 850nm wavelength band is used alone to realize high-resolution imaging, or a 1310nm wavelength band is used alone to realize large imaging depth, and generally two important performances of high resolution and large imaging depth cannot be considered simultaneously. The two wave bands are combined to image, and high resolution and large imaging depth are expected to be simultaneously realized. Although some scholars in recent years have tried to image with two wavelength bands simultaneously based on the structure of time-domain OCT, full-field OCT or frequency-domain OCT, respectively, some technical problems are still encountered. For example, two interference light paths and two detection devices (such as a spectrometer) are generally required to be built at the same time to realize interference and detection of different wave bands, and meanwhile, under the condition of a wide wavelength range, the problems of dispersion mismatch, polarization mismatch and the like are also required to be solved, so that more optical components and devices in the light path of the system are required, the building is complex, the size is large, the imaging speed is not high, the scanning mode is not flexible, the cost is high, and the complex and variable imaging requirements of a crime scene cannot be met.
Disclosure of Invention
In view of the above problems, it is an object of the present invention to provide a handheld dual-band common-path optical tomography system capable of effectively avoiding dispersion mismatch and polarization mismatch by a common-path design.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
the invention provides a hand-held dual-waveband common-path optical tomography imaging system, which comprises:
the first waveband tomography module comprises a broadband light source, a first circulator and a spectrometer;
the second wave band tomography module comprises a sweep frequency light source, a second circulator, a coupler and a detector;
the sample scanning handle comprises a first collimator, a second collimator, a dichroic mirror, a wave-splitting front mirror, a reflecting mirror, an off-axis parabolic mirror and a two-dimensional MEMS vibrating mirror; wherein:
light emitted by the broadband light source is emitted to the first collimator through the first circulator, is emitted to the dichroic mirror through the first collimator, is emitted to the wave splitting front mirror through part of light transmitted by the dichroic mirror, is reflected to the reflecting mirror through the wave splitting front mirror and then returns to be reference light according to an original light path, the other part of light transmitted by the dichroic mirror is directly incident to the off-axis parabolic mirror and then is reflected and focused, a focused light beam is incident to a sample through the two-dimensional MEMS vibrating mirror, light reflected and scattered by the sample is sample light, the sample light and the reference light are converged along the original light path and then interfere with each other, the interference light enters the spectrometer through the first circulator, and a spectrum signal of the interference light detected by the spectrometer is processed to realize tomography of the sample;
light emitted by the sweep-frequency light source is emitted to a second collimator through a second circulator and is emitted to a dichroic mirror through the second collimator, a part of light reflected by the dichroic mirror is incident to a wave-splitting front mirror, the light is reflected to a reflecting mirror through the wave-splitting front mirror and then returns to be reference light, the other part of light reflected by the dichroic mirror is directly incident to an off-axis parabolic mirror and then is reflected and focused, a focused light beam is incident to a sample through a two-dimensional MEMS (micro-electromechanical systems) vibrating mirror, the light reflected and scattered by the sample is sample light, the sample light and the reference light are returned along the original path and converged and then interfere, the interference light is sent to a coupler after passing through a second circulator, the coupler divides the interference light into two beams according to a set splitting ratio and then enters a detector to obtain spectral signals of the interference light.
In some embodiments of the present invention, the broadband light source has a center wavelength of 850 nm.
In some embodiments of the present invention, the swept source has a center wavelength of 1310 nm.
In some embodiments of the invention, the wave-splitting front mirror adopts a silvered reflector, and the splitting ratio of the reference light and the sample light can be continuously changed by adjusting the position of the wave front split by the wave-splitting front mirror.
In some embodiments of the invention, optical signals are transmitted between the broadband light source, the first circulator, the spectrometer and the first collimator by using optical fibers; and optical signals are transmitted among the swept-frequency light source, the second circulator, the coupler, the detector and the second collimator by adopting optical fibers.
In some embodiments of the present invention, the optical fiber is a single mode optical fiber.
In some embodiments of the present invention, the spectrometer is a wave number linear spectrometer, the wave number linear spectrometer includes a prism and a CCD, and the interference light is split by the prism and focused on the CCD to realize the collection of the linear wave number spectrum.
In some embodiments of the invention, the detector is a dual balanced detector.
In some embodiments of the invention, the sample scanning handle further comprises a housing for housing the optics.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the invention is based on the design of a reflective two-waveband fusion common-path scanning light path of a dichroic mirror, the working wavebands with central wavelengths of 850nm and 1310nm are fused for use, high resolution and large imaging depth are considered, and the physical evidence detection without damage, in-situ, high resolution and large imaging depth can be realized;
2. the invention adopts the common-path design of the optical fibers of the reference arm and the sample arm, effectively avoids the problems of dispersion mismatching and polarization mismatching, simplifies the system structure, is beneficial to building a miniaturized and portable system and realizes mobile flexible imaging; in the traditional OCT system structure, a reference arm and a sample arm are required to be respectively built, and different light paths are adopted, so that the problems of dispersion mismatching and polarization mismatching exist between reference light and sample light, and usually, a dispersion compensation component or a polarization controller is required to be added for correction and adjustment; furthermore, a common-path designed optical path is adopted, compared with the traditional OCT system structure, the device such as a coupler, a dispersion compensator, a polarization controller and the like required for building a reference arm is omitted, and fewer parts are required by the system, so that the system can be more compact and more flexible;
3. the invention adopts the design of a wave-splitting front interferometer to achieve the optimal signal-to-noise ratio, the wave-splitting front mirror is added in the sample scanning handle, the splitting ratio of the reference light and the sample light can be continuously changed by adjusting the position of the wave-splitting front mirror, so that the reference arm does not need any attenuation, the utilization efficiency of the light source is greatly improved, and meanwhile, the adjustable splitting ratio can obtain the more optimal system signal-to-noise ratio to obtain a higher-quality image;
4. the sample scanning handle module adopts a reflection type dual-waveband fusion common-path scanning light path design and a two-dimensional MEMS micro-vibration mirror based on a dichroic mirror, so that a portable handheld scanning handle can simultaneously acquire dual-waveband data, and the whole system has the characteristics of miniaturization, portability, compactness and modularization;
in conclusion, the OCT system design of 'dual-band + common path + split wave front' is adopted, so that the system has both high resolution and large imaging depth, the band range is richer, the problems of dispersion mismatching and polarization mismatching are effectively avoided, the splitting ratio of the reference light and the sample light is continuously adjustable, the signal-to-noise ratio of the system is further optimized, the utilization efficiency of the light source light is greatly improved, and the material evidence detection with lossless, in-situ, high resolution and large imaging depth is favorably realized.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like reference numerals refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic diagram of a handheld dual band optical tomography imaging system of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "upper", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.
The handheld dual-waveband common-path optical tomography imaging system provided by the embodiment can realize in-situ, nondestructive and tomography inspection and analysis aiming at various on-site material evidences.
As shown in fig. 1, the handheld dual-band common-path optical tomography imaging system provided in this embodiment includes a first band tomography module 1, a second band tomography module 2, and a sample scanning handle module 3.
The first waveband tomographic scanning module 1 includes a broadband light source 11, a first circulator 12 and a spectrometer 13, and preferably, the central wavelength of the broadband light source 11 can be selected to be 850 nm.
The second waveband tomography module 2 comprises a swept-frequency light source 21, a second circulator 22, a coupler 23 and a double balanced detector 24, wherein the swept-frequency light source 21 is a light source which outputs light with wavelength scanned at high speed along with time, and the central wavelength of the swept-frequency light source 21 can be preferably selected to be 1310 nm.
The sample scanning handle 3 includes a first collimator 31, a second collimator 32, a dichroic mirror 33, a dichroic mirror 34, a reflecting mirror 35, an off-axis parabolic mirror 36, and a two-dimensional MEMS galvanometer 37.
Light emitted by the 850nm broadband light source 11 enters the sample scanning handle 3 after passing through the first circulator 12, is emitted to the dichroic mirror 32 through the first collimator 31, a part of light transmitted by the dichroic mirror 32 is emitted to the wave splitting front mirror 33, is reflected to the reflecting mirror 34 through the wave splitting front mirror 33 and then returns to be reference light according to an original light path, the other part of light transmitted by the dichroic mirror 32 is directly incident to the off-axis parabolic mirror 36 without passing through the wave splitting front mirror 33 and then is reflected and focused, a focused light beam is incident to a sample through the two-dimensional MEMS vibration mirror 37, and the light reflected and scattered by the sample is sample light. The sample light and the reference light are converged along an original light path and then interfere, the interference light enters the spectrometer 13 after passing through the first circulator 12, the spectrometer 13 detects spectral signals of the interference light and processes data to obtain OCT signals of 850nm waveband, the tomography of the sample is realized, one-line A-Scan signals in the depth direction of the sample of 850nm waveband can be obtained, two-dimensional and three-dimensional images of the internal structure of the sample are obtained along with the transverse scanning of the two-dimensional MEMS galvanometer 37, the resolution of the OCT images of the 850nm waveband is high, and the OCT system is suitable for detecting, imaging and measuring the internal fine structure of the sample.
The light emitted by the 1310nm sweep light source 21 enters the sample scanning handle 3 through the second circulator 22, is emitted to the dichroic mirror 33 through the second collimator 32, a part of the light reflected by the dichroic mirror 33 enters the wave splitting front mirror 34, is reflected to the reflecting mirror 35 through the wave splitting front mirror 34 and then returns to be reference light, the other part of the light reflected by the dichroic mirror 33 directly enters the off-axis parabolic mirror 36 without the wave splitting front mirror 34 and is reflected and focused, the focused light beam enters a sample through the two-dimensional MEMS vibrating mirror 37, and the light reflected and scattered by the sample is sample light. The sample light and the reference light are returned along the original path and converged to generate interference, the interference light is sent to the coupler 23 after passing through the second circulator 22, the coupler 23 divides the interference light into two beams according to a set proportion and then enters the double-balanced detector 24 to obtain a spectral signal of the interference light for detection and processing, the tomography of the sample is realized, a first-line A-Scan signal in the sample depth direction of 1310nm wave band can be obtained, two-dimensional and three-dimensional images of the internal structure of the sample are obtained along with the transverse scanning of the two-dimensional MEMS galvanometer 37, the penetration depth of the OCT image of the nm wave band is large, and the OCT image is suitable for detecting and imaging the structure of the deep area in the sample 1310.
Preferably, the wave-splitting front mirror 34 can adopt a silvered mirror, which has a high reflectivity in both visible and near-infrared bands, the wave-splitting front mirror 34 is used for splitting the wave front of incident light into two beams, one part of the light is reflected by the mirror 34 to become reference light, the other part of the light is focused by the off-axis parabolic mirror 36 and is deflected by the two-dimensional MEMS galvanometer 37 to scan the sample to obtain sample light, the reference light and the sample light return along the original light path, and are recombined at the wave-splitting front mirror 34 to generate wave front interference. Therefore, in the embodiment, by designing the wavefront splitting interferometer, an optimal signal-to-noise ratio is achieved, and by adjusting the position of the wavefront splitting mirror 34 for splitting the wavefront, the splitting ratio of the reference light and the sample light is continuously changed, so that the reference arm does not need any attenuation, the utilization efficiency of the light source is greatly improved, and meanwhile, a more optimized system signal-to-noise ratio can be obtained by adjusting the splitting ratio, and a higher-quality image can be obtained.
Preferably, optical fibers are used for optical signal transmission among the broadband light source 11, the first circulator 12, the spectrometer 13 and the first collimator 31, and optical fibers are used for optical signal transmission among the swept-frequency light source 21, the second circulator 22, the coupler 23, the double balanced detector 24 and the second collimator 32; preferably, the optical fiber is a single-mode optical fiber, and the operating wavelength of the single-mode optical fiber is in accordance with the requirement of the band range of the transmitted light, so that the single-mode optical fiber is ensured to be low in loss in the band range.
Preferably, the two-dimensional MEMS galvanometer 37 is used to control the deflection and position of the light beam, to implement the lateral scanning of the sample, and to implement the precise positioning and fast scanning of the light spot position, which has the advantages of small volume and flexible control, and the two-dimensional MEMS galvanometer 37 can be a two-dimensional high-speed scanning MEMS galvanometer of Mirrorcle company.
Preferably, the spectrometer 13 may be a wave number linear spectrometer, the wave number linear spectrometer 13 includes a prism and a CCD prism, and the prism may be a PS852 equilateral dispersion prism manufactured by Thorlabs corporation, and the interference light is split by the prism and then focused on the CCD to realize the collection of the linear wave number spectrum, thereby saving the processing of performing the wavelength-wave number interpolation conversion at the later stage and improving the imaging speed.
Preferably, the off-axis parabolic mirror 36 may be implemented as MPD01M9-P01 off-axis parabolic mirror manufactured by Thorlabs.
Preferably, the first circulator 12 and the second circulator 22 may use broadband fiber circulators with corresponding wavelength ranges to ensure that their operating bands cover the desired transmission band.
Preferably, the first collimator 31 and the second collimator 32 may employ a parabolic reflection type collimator RC02APC-P01 manufactured by Thorlabs.
Preferably, the double balanced detector 24 can effectively reduce the common mode noise of the input light and improve the signal-to-noise ratio of the system, and the double balanced detector 24 can adopt a double balanced detector PDB440C manufactured by Thorlabs corporation.
Preferably, sample scanning handle 3 still includes a casing, and the casing is used for setting up each optical device, does not specifically do the repeated description, can carry out the setting of casing according to actual need, conveniently carry the use can.
In conclusion, the invention can realize the real-time dual-band combination, so that the real-time contrast fusion imaging of the OCT image dual-band can be realized, and the dual requirements of resolution and penetration depth can be met; by analyzing the dual-band spectral data, the OCT signal response characteristics of the substances under different bands can be obtained, and the distinguishing and the identification of different substances are realized; the hand-held OCT imaging system with two different working wave bands fused enriches the technical means and methods for inspecting the material evidence at the crime scene, breaks through the limitation of the traditional microscopic imaging, realizes the mining and extraction of the internal characteristic information of the material evidence, obtains the high-resolution and high-penetration-depth image at the same time, and solves the problem that the resolution and the penetration depth are mutually restricted. The invention is beneficial to greatly improving the efficiency of finding and confirming the on-site material evidence, thereby providing more diversified and scientific clues and basis for case investigation litigation.
The above embodiments are only used to illustrate the present invention, wherein each optical device in the optical path may be supported and fixed by using a corresponding structure, and details of this embodiment are not repeated, as long as the optical path propagation conditions of this embodiment are satisfied, the structures, connection manners, manufacturing processes, and the like of each component of this embodiment may be changed, and any equivalent transformation and improvement performed on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.
Claims (9)
1. A handheld dual-band common-path optical tomography imaging system, the system comprising:
the first waveband tomography module comprises a broadband light source, a first circulator and a spectrometer;
the second wave band tomography module comprises a sweep frequency light source, a second circulator, a coupler and a detector;
the sample scanning handle comprises a first collimator, a second collimator, a dichroic mirror, a wave-splitting front mirror, a reflecting mirror, an off-axis parabolic mirror and a two-dimensional MEMS vibrating mirror; wherein:
light emitted by the broadband light source is emitted to the first collimator through the first circulator, is emitted to the dichroic mirror through the first collimator, is emitted to the wave splitting front mirror through part of light transmitted by the dichroic mirror, is reflected to the reflecting mirror through the wave splitting front mirror and then returns to be reference light according to an original light path, the other part of light transmitted by the dichroic mirror is directly incident to the off-axis parabolic mirror and then is reflected and focused, a focused light beam is incident to a sample through the two-dimensional MEMS vibrating mirror, light reflected and scattered by the sample is sample light, the sample light and the reference light are converged along the original light path and then interfere with each other, the interference light enters the spectrometer through the first circulator, and a spectrum signal of the interference light detected by the spectrometer is processed to realize tomography of the sample;
light emitted by the sweep-frequency light source is emitted to a second collimator through a second circulator and is emitted to a dichroic mirror through the second collimator, a part of light reflected by the dichroic mirror is incident to a wave-splitting front mirror, the light is reflected to a reflecting mirror through the wave-splitting front mirror and then returns to be reference light, the other part of light reflected by the dichroic mirror is directly incident to an off-axis parabolic mirror and then is reflected and focused, a focused light beam is incident to a sample through a two-dimensional MEMS (micro-electromechanical systems) vibrating mirror, the light reflected and scattered by the sample is sample light, the sample light and the reference light are returned along the original path and converged and then interfere, the interference light is sent to a coupler after passing through a second circulator, the coupler divides the interference light into two beams according to a set splitting ratio and then enters a detector to obtain spectral signals of the interference light.
2. The handheld dual band common path optical tomography imaging system of claim 1 wherein the broadband light source has a center wavelength of 850 nm.
3. The handheld dual band co-channel optical tomography imaging system of claim 1 wherein the swept source has a center wavelength of 1310 nm.
4. The hand-held dual-band common-path optical tomography imaging system of claim 1, wherein the wave-splitting front mirror is a silvered reflector, and the splitting ratio of the reference light and the sample light can be continuously changed by adjusting the position of the wave front split by the wave-splitting front mirror.
5. The hand-held dual-band common-path optical tomography imaging system of claim 1, wherein optical signals are transmitted between the broadband light source, the first circulator, the spectrometer and the first collimator using optical fibers; and optical signals are transmitted among the swept-frequency light source, the second circulator, the coupler, the detector and the second collimator by adopting optical fibers.
6. The hand-held dual-band co-channel optical tomography imaging system of claim 5 wherein the optical fiber is a single mode optical fiber.
7. The handheld dual-band co-channel optical tomography imaging system as claimed in any one of claims 1 to 6, wherein the spectrometer is a wave number linear spectrometer, the wave number linear spectrometer comprises a prism and a CCD, the interference light is split by the prism and then focused on the CCD, and the collection of the linear wave number spectrum is realized.
8. The handheld dual band common path optical tomography imaging system of any of claims 1 to 6, wherein the detector is a dual balanced detector.
9. The handheld dual band common path optical tomography imaging system of any of claims 1-6, wherein the sample scanning handle further comprises a housing for housing the optics.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111751013A (en) * | 2020-07-07 | 2020-10-09 | 中国科学院长春光学精密机械与物理研究所 | Aberration measuring method for optical imaging and optical imaging method |
| CN112545449A (en) * | 2020-11-20 | 2021-03-26 | 广东唯仁医疗科技有限公司 | Skin OCT system capable of being embedded into mobile phone |
| CN112587086A (en) * | 2021-03-04 | 2021-04-02 | 季华实验室 | Dual-mode polarization optical coherent imaging system and imaging method thereof |
| CN112587085A (en) * | 2021-03-04 | 2021-04-02 | 季华实验室 | Optical coherent imaging system |
| CN114724299A (en) * | 2022-04-01 | 2022-07-08 | 公安部物证鉴定中心 | Method and system for identifying authenticity of paper currency based on tomographic image characteristics |
| CN115372313A (en) * | 2022-10-21 | 2022-11-22 | 合肥金星智控科技股份有限公司 | Detection light path and detection system based on TDLAS technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111751013A (en) * | 2020-07-07 | 2020-10-09 | 中国科学院长春光学精密机械与物理研究所 | Aberration measuring method for optical imaging and optical imaging method |
| CN112545449A (en) * | 2020-11-20 | 2021-03-26 | 广东唯仁医疗科技有限公司 | Skin OCT system capable of being embedded into mobile phone |
| CN112587086A (en) * | 2021-03-04 | 2021-04-02 | 季华实验室 | Dual-mode polarization optical coherent imaging system and imaging method thereof |
| CN112587085A (en) * | 2021-03-04 | 2021-04-02 | 季华实验室 | Optical coherent imaging system |
| CN114724299A (en) * | 2022-04-01 | 2022-07-08 | 公安部物证鉴定中心 | Method and system for identifying authenticity of paper currency based on tomographic image characteristics |
| CN114724299B (en) * | 2022-04-01 | 2023-09-12 | 公安部物证鉴定中心 | Banknote authenticity identification method and system based on tomographic image characteristics |
| CN115372313A (en) * | 2022-10-21 | 2022-11-22 | 合肥金星智控科技股份有限公司 | Detection light path and detection system based on TDLAS technology |
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