CN116625508B - Multi-target hyperspectral detection system based on optical fiber array - Google Patents
Multi-target hyperspectral detection system based on optical fiber array Download PDFInfo
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- CN116625508B CN116625508B CN202310883294.6A CN202310883294A CN116625508B CN 116625508 B CN116625508 B CN 116625508B CN 202310883294 A CN202310883294 A CN 202310883294A CN 116625508 B CN116625508 B CN 116625508B
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- 238000001514 detection method Methods 0.000 title claims abstract description 29
- 239000013307 optical fiber Substances 0.000 title claims abstract description 29
- 239000006185 dispersion Substances 0.000 claims abstract description 39
- 239000000835 fiber Substances 0.000 claims abstract description 22
- 238000003384 imaging method Methods 0.000 claims abstract description 13
- 239000011159 matrix material Substances 0.000 claims abstract description 10
- 230000008859 change Effects 0.000 claims abstract description 4
- 238000001228 spectrum Methods 0.000 abstract description 10
- 230000003595 spectral effect Effects 0.000 abstract description 7
- 101700004678 SLIT3 Proteins 0.000 description 11
- 102100027339 Slit homolog 3 protein Human genes 0.000 description 11
- 230000003287 optical effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000701 chemical imaging Methods 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0218—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using optical fibers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
- G01J3/18—Generating the spectrum; Monochromators using diffraction elements, e.g. grating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
- G01J3/18—Generating the spectrum; Monochromators using diffraction elements, e.g. grating
- G01J3/1809—Echelle gratings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2803—Investigating the spectrum using photoelectric array detector
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2803—Investigating the spectrum using photoelectric array detector
- G01J2003/282—Modified CCD or like
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
Abstract
The invention relates to the technical field of spectrum equipment, and particularly provides a multi-target hyperspectral detection system based on an optical fiber array. Comprising the following steps: a light source, a narrow-band multi-color light forming system, a dispersion system and a detector system; the narrow-band compound-color light forming system comprises a narrow-band filter wheel, an optical fiber bundle array and a slit; the light source is used for emitting broadband polychromatic light, the broadband polychromatic light enters the fiber bundle array after passing through the narrow-band filter wheel, the fiber bundle array cuts a surface view field into a matrix view field, and then enters the slit to change the matrix view field into a linear array view field, so that the narrow-band polychromatic light is obtained; and the narrow-band polychromatic light is incident into the detector system after the dispersion system generates a dispersion light beam, so as to obtain a hyperspectral image. The advantages are that: the miniaturization is ensured, the spectrum resolution is improved, and the multi-target detection of the surface view field is realized; spectral resolution imaging at pm level is achieved.
Description
Technical Field
The invention relates to the technical field of spectrum equipment, in particular to a multi-target hyperspectral detection system based on an optical fiber array.
Background
Compared with the conventional grating spectrometer, the echelle grating spectrometer has the advantages of high spectral resolution, high diffraction efficiency, full-spectrum transient direct reading and the like, is a preferred spectrometer for fine analysis of inductively coupled plasma, laser-induced plasma, spark spectrum and astronomical spectrum, and is widely applied to the fields of atomic emission spectrum detection, astronomical star detection and the like.
In the prior art, the basic optical path of the echelle grating spectrometer is a Czerny-Turner optical path, the structure of which is shown in fig. 1, and most designs of the echelle grating spectrometer are improved and evolved from the optical path according to the performance index. Wherein, the liquid crystal display device comprises a liquid crystal display device,the incident angle of incident light is defined as the included angle between the projection of the wave vector of light ray in the main section and the grating normal, and has positive and negative characteristics, the same side of the grating normal is different, and the two sides of the grating normal are same. />The azimuth angle of incidence of incident light is defined as the angle between the wave vector and the main section. L, W is the length and width of the echelle grating. The polychromatic light enters from the pinhole, becomes parallel light beam by the collimating lens, and then enters the echelle gratingxThe first dispersion splitting is performed in the direction. The first dispersion beam has multiple orders of spectrum overlapping, and needs to be formed by another grating or prismyAnd carrying out second dispersion light splitting in the direction, and finally, imaging the two-dimensional dispersion light beam on an image plane by a converging mirror to obtain the two-dimensional distribution of the pinhole monochromatic image.
The existing echelle grating spectrometer is small-hole incident and can only detect single points, if ultrahigh spectral resolution detection is needed, the focal length of the system is required to be lengthened, the length-width ratio of the echelle grating is increased, the volume of the instrument is large, the echelle grating is difficult to process, the echelle grating is difficult to match with a detector, and meanwhile, the aberration correction is difficult.
In summary, how to design a spectrum detection system capable of improving spectrum resolution and realizing multi-target detection of a surface view field while ensuring miniaturization of a spectrometer is a problem to be solved currently.
Disclosure of Invention
The invention provides a multi-target hyperspectral detection system based on an optical fiber array for solving the problems.
The invention aims to provide a multi-target hyperspectral detection system based on an optical fiber array, which is characterized by comprising the following components: a light source, a narrow-band multi-color light forming system, a dispersion system and a detector system; the narrow-band compound-color light forming system comprises a narrow-band filter wheel, an optical fiber bundle array and a slit;
the light source is used for emitting broadband polychromatic light, the broadband polychromatic light enters the fiber bundle array after passing through the narrow-band filter wheel, the fiber bundle array cuts a surface view field into a matrix view field, and then enters the slit to change the matrix view field into a linear array view field, so that the narrow-band polychromatic light is obtained;
and the narrow-band polychromatic light is incident into the detector system after the dispersion system generates a dispersion light beam, so as to obtain a hyperspectral image.
Preferably, the input end of the fiber bundle array is an N x N fiber bundle array, and the output end is 1 x N 2 And (5) an optical fiber bundle linear array.
Preferably, the dispersion system comprises a collimator and an echelle grating;
the narrow-band polychromatic light is collimated by the collimating lens and then enters the echelle grating, and is subjected to narrow-band dispersion by the echelle grating to form a dispersion light beam, and then enters the detector system.
Preferably, the length direction of the slit is perpendicular to the dispersion direction.
Preferably, the detector system comprises an imaging mirror and a detector arranged in sequence along the optical path; the dispersed light beams are converged by the imaging mirror and then are incident to the detector.
Preferably, the light at each position in the linear array field of view corresponds to a pixel of the detector.
Preferably, the dispersion system further comprises a turning mirror, which is arranged between the slit and the collimating mirror.
Preferably, the detector is an imperx area array CMOS.
Preferably, the bandwidth of the narrowband polychromatic light is 30-100 nm.
Compared with the prior art, the invention has the following beneficial effects:
the multi-target hyperspectral detection system based on the optical fiber array ensures miniaturization, improves the spectral resolution and realizes multi-target detection of a surface view field; the problems that the existing echelle grating spectrometer is incident to a small hole and can only detect a single point, if ultrahigh spectral resolution detection is needed, the focal length of a system is required to be lengthened, the length-width ratio of the echelle grating is increased, the volume of the instrument is large, the echelle grating is difficult to process and is difficult to match with a detector, meanwhile, difficulty is brought to aberration correction are solved, and pm-level spectral resolution imaging is realized.
Drawings
FIG. 1 is a schematic diagram of the optical path structure of an echelle grating spectrometer.
Fig. 2 is a schematic diagram of a multi-target hyperspectral detection system based on an optical fiber array according to an embodiment of the present invention.
Fig. 3 is a schematic flow chart of imaging of a multi-target hyperspectral detection system based on an optical fiber array according to an embodiment of the present invention.
Fig. 4 is a schematic view of a cut field of view of an array of fiber optic bundles provided in accordance with an embodiment of the present invention.
Fig. 5 is a schematic view of target surface dispersion of a detector according to an embodiment of the present invention.
Reference numerals:
1. a narrowband filter wheel; 2. an array of optical fiber bundles; 3. a slit; 4. a collimator lens; 5. an echelle grating; 6. an imaging mirror; 7. a detector.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, like modules are denoted by like reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, a detailed description thereof will not be repeated.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limiting the invention.
FIG. 2 illustrates a multi-target hyperspectral detection system based on an optical fiber array, comprising: a light source, a narrow-band multi-color light forming system, a dispersion system and a detector system; the narrow-band compound-color light forming system comprises a narrow-band filter wheel 1, an optical fiber bundle array 2 and a slit 3; the dispersion system comprises a collimating lens 4 and an echelle grating 5; the detector system comprises an imaging mirror 6 and a detector 7 which are arranged in sequence along the light path;
the light source adopts a broadband high-power halogen light source and is used for emitting broadband polychromatic light; the wide-band polychromatic light enters the optical fiber bundle array 2 after passing through the narrow-band optical filter wheel 1, cuts the surface view field into a matrix view field through the optical fiber bundle array 2, and then enters the slit 3 to change the matrix view field into a linear array view field so as to obtain the narrow-band polychromatic light; the narrow-band polychromatic light is collimated by the collimating lens 4 and then enters the echelle grating 5, and is subjected to narrow-band dispersion by the echelle grating 5 to form a dispersion light beam, and the dispersion light beam is converged by the imaging lens 6 and then enters the detector 7 to obtain a hyperspectral image.
The input end of the fiber bundle array 2 is an N x N fiber bundle array, and the output end is 1 x N 2 And (5) an optical fiber bundle linear array.
The length direction of the slit 3 is perpendicular to the dispersion direction.
The light at each position in the linear array field of view corresponds to a picture element of the detector 7.
In a specific embodiment, a turning mirror is further arranged between the slit 3 and the collimator mirror 4.
In a specific embodiment, the slit 3 is an electric slit.
In a specific embodiment, the detector 7 is an imperx area array CMOS.
Example 1
The embodiment provides a multi-target hyperspectral detection system based on an optical fiber array, which comprises the following components: the optical fiber laser comprises a light source, a narrow-band filter wheel 1, an optical fiber bundle array 2, a slit 3, a collimating lens 4, an echelle grating 5, an imaging lens 6 and a detector 7;
FIG. 4 is a schematic view of a cut field of view of a fiber array, wherein the input end of the fiber array 2 is a 3×3 fiber array, and the output end is a 1×9 fiber array, so as to convert the field of view of the array into a linear array field of view and enter the slit 3;
the slit 3 is an electric slit, and the purpose of adopting the electric slit is to control the size and the position of the slit in the system adjustment process; the length direction of the slit 3 is perpendicular to the dispersion direction, that is, the linear array field of view is perpendicular to the dispersion direction, and the dispersion direction means that each space point on the slit can be dispersed along the dispersion direction shown in fig. 5; FIG. 5 is a schematic view of the dispersion of the target surface of the detector, wherein the size of the image surface is shown by taking the conventional CMOS as an example, the number of pixels of the target surface is 1024×1024, the size of the pixels is 7.4um, and the relationship between the dispersion direction and the slit length direction is shown in the figure;
the detector 7 is an imperx area array CMOS;
the light source is used for emitting broadband polychromatic light, the broadband polychromatic light enters the optical fiber bundle array 2 after passing through the narrowband optical filter wheel 1, the surface view field is cut into a matrix view field by the optical fiber bundle array 2, and then the matrix view field is changed into a linear array view field by entering the slit 3, so that narrowband polychromatic light is obtained; the narrow-band polychromatic light is collimated by the collimating lens 4 and then enters the echelle grating 5, and is subjected to narrow-band dispersion by the echelle grating 5 to form a dispersion light beam, and the dispersion light beam is converged by the imaging lens 6 and then enters the detector 7 to obtain a hyperspectral image.
The bandwidth of the narrowband polychromatic light is 50nm.
The echelle grating 5 in the invention works at a higher blazed level by utilizing the lower linear density and the larger blazed angle, and the free spectral area of each level is narrower, so that broadband complex-color light is required to be changed into narrowband complex-color light and then dispersed by the echelle grating 5, so that the problems of spectrum aliasing and the like are avoided; meanwhile, the system can finish the hyperspectral imaging of the final wide-band surface view field, reduces system moving parts and provides a solution idea for dynamic hyperspectral detection.
Example 2
The difference between the multi-target hyperspectral detection system based on the optical fiber array and the embodiment 1 is that a turning mirror is further arranged between the slit 3 and the collimating mirror 4; the purpose of the folding mirror is to reduce the volume of the whole system after folding.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present disclosure may be performed in parallel, sequentially, or in a different order, provided that the desired results of the technical solutions of the present disclosure are achieved, and are not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (8)
1. The multi-target hyperspectral detection system based on the optical fiber array is characterized by comprising: a light source, a narrow-band multi-color light forming system, a dispersion system and a detector system; the narrow-band compound-color light forming system comprises a narrow-band filter wheel, an optical fiber bundle array and a slit;
the light source is used for emitting broadband polychromatic light, the broadband polychromatic light enters the fiber bundle array after passing through the narrow-band filter wheel, the fiber bundle array cuts a surface view field into a matrix view field, and then enters the slit to change the matrix view field into a linear array view field, so that the narrow-band polychromatic light is obtained;
the narrow-band polychromatic light is incident into the detector system after the chromatic dispersion system generates a chromatic dispersion light beam, so that a hyperspectral image is obtained;
the dispersion system comprises a collimating mirror and an echelle grating; the narrow-band polychromatic light is collimated by the collimating lens and then enters the echelle grating, and is subjected to narrow-band dispersion by the echelle grating to form a dispersion light beam, and then enters the detector system.
2. The fiber array-based multi-target hyperspectral detection system of claim 1, wherein: the input end of the optical fiber bundle array is an N x N optical fiber bundle array, and the output end is 1 x N 2 And (5) an optical fiber bundle linear array.
3. The fiber array-based multi-target hyperspectral detection system of claim 2, wherein: the length direction of the slit is perpendicular to the dispersion direction.
4. The fiber array-based multi-target hyperspectral detection system of claim 3, wherein: the detector system comprises an imaging mirror and a detector which are sequentially arranged along the light path; the dispersed light beams are converged by the imaging mirror and then are incident to the detector.
5. The fiber array-based multi-target hyperspectral detection system of claim 4, wherein: the light at each position in the linear array field of view corresponds to a pixel of the detector.
6. The fiber array-based multi-target hyperspectral detection system of claim 5, wherein: the dispersion system further includes a turning mirror disposed between the slit and the collimating mirror.
7. The fiber array-based multi-target hyperspectral detection system of claim 6, wherein: the detector is an imperx area array CMOS.
8. The fiber array-based multi-target hyperspectral detection system of claim 7, wherein: the bandwidth of the narrowband polychromatic light is 30-100 nm.
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| US6327292B1 (en) * | 1998-09-08 | 2001-12-04 | Massachusetts Institute Of Technology | External cavity laser source using spectral beam combining in two dimensions |
| CN102435311A (en) * | 2011-09-07 | 2012-05-02 | 杭州远方光电信息股份有限公司 | Optical fiber bundle spectrometer |
| CN103776531A (en) * | 2014-01-01 | 2014-05-07 | 西安应用光学研究所 | Near infrared weak pulse spectral radiance calibration device |
| CN104729708A (en) * | 2015-03-11 | 2015-06-24 | 航天东方红卫星有限公司 | Anastigmatic broadband spectrum detection grating spectrometer |
| CN216349114U (en) * | 2021-05-11 | 2022-04-19 | 中国科学院云南天文台 | High sampling efficiency integral field spectrometer optical system |
| CN115235629A (en) * | 2022-07-27 | 2022-10-25 | 中国科学院长春光学精密机械与物理研究所 | Hyper-spectral resolution imaging system and design method thereof |
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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8098373B2 (en) * | 2009-04-15 | 2012-01-17 | Chemimage Corporation | Spatially and spectrally parallelized fiber array spectral translator system and method of use |
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- 2023-07-19 CN CN202310883294.6A patent/CN116625508B/en active Active
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|---|---|---|---|---|
| US6327292B1 (en) * | 1998-09-08 | 2001-12-04 | Massachusetts Institute Of Technology | External cavity laser source using spectral beam combining in two dimensions |
| CN102435311A (en) * | 2011-09-07 | 2012-05-02 | 杭州远方光电信息股份有限公司 | Optical fiber bundle spectrometer |
| CN103776531A (en) * | 2014-01-01 | 2014-05-07 | 西安应用光学研究所 | Near infrared weak pulse spectral radiance calibration device |
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