CN102507001A - Refraction-reflection type imaging spectrometer optical system based on prism-grating-prism decomposition - Google Patents
Refraction-reflection type imaging spectrometer optical system based on prism-grating-prism decomposition Download PDFInfo
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Abstract
The invention discloses a refraction-reflection type imaging spectrometer optical system based on a prism-grating-prism decomposition, which is characterized by comprising a field stop, a collimate mirror, a plane mirror, a decomposition assembly, a convergent mirror group and a optical filter which are arranged sequentially from an object to an image. The optical system is in refraction-reflection type, the collimate mirror is a concave spherical reflector, the convergent mirror group is a spherical lens group, the decomposition assembly is of a prism-grating-prism form, a prism and a grating are combined for correcting spectrum curvature of the decomposition assembly, the grating is a reflection type plane grating, and an angle is formed between the convergent mirror group and the decomposition assembly in the optical axis direction and used for adjusting residual spectrum curvature of the optical system. The refraction-reflection type imaging spectrometer optical system based on the prism-grating-prism decomposition has the advantages of low spectrum curvature, high optical efficiency, compact structure, simply processing and installing and adjusting procedures and flexibility in selecting spectrum segments.
Description
Technical field
The present invention relates to optical element, system, specifically be meant a kind of catadioptric formula imaging spectrometer optical system based on prism-grating-prismatic decomposition.
Background technology
Imaging spectrometer is a kind of instrument that is used for obtaining target two-dimensional space information and spectral information; Obtain the spectrum picture of target with high spectral resolution; Be used for target is surveyed identification and material composition analysis etc., be widely used in fields such as national product, military affairs and scientific researches.
The color dispersion-type spectrum imaging system generally has structures such as Offner, Dyson, PGP, prism and plane grating.Offner and the bending of Dyson structure slit are very little, be the extraordinary selection of spectrum imaging system, but the curved surface grating manufacturing cost are high.The PGP structure is the array configuration of a kind of prism and grating, and grating is a transmission-type body holographic phase grating, and the grating substrate is a kind of gelatin mass, and front and rear surfaces is stained with cover glass.Receive the restriction of base material and technology, be difficult for obtaining the vpg of the low groove number of wide spectrum.
Summary of the invention
Technology of the present invention is dealt with problems and is: based on some problems of above-mentioned prior art existence; The purpose of this invention is to provide a kind of catadioptric formula imaging spectrometer optical system based on prism-grating-prismatic decomposition, its spectrum bending is low, and optical efficiency is high; Compact conformation, spectral coverage is selected flexibly.
Optical texture signal of the present invention is as shown in Figure 1.Optical system is made up of field stop and light beam steering assembly 1, collimating mirror 2, spectrum groupware 3, convergent mirror group 4 and optical filter 5.
From beam emissions to the collimating mirror 2 that field stop 7 is sent, turn back to spectrum groupware 3 through plane mirror 8 after the beam collimation, assemble by convergent mirror group 4, after optical filter 5 disappears second order spectrum, imaging on picture plane 6.
As shown in Figure 2, described field stop and light beam steering assembly 1 are fitted with plane mirror 8 by field stop 7 and are formed, and plane mirror 8 centers have the logical light groove of a rectangle, and the surface is coated with reflectance coating thereafter.
Described collimating mirror 2 is a concave spherical mirror.
Described spectrum groupware 3 is prism-grating-prism form; Its grating is reflective plane grating; First prism and second prism are distributed in the front and back of plane reflection grating respectively, and grating line is several to be confirmed according to the dimension of the spectrum on convergent mirror group focal length and photosurface length.In optical design software, on one side can certain of prism be set to the dip plane, the angle of inclination is set to optimized amount, and the crooked optimization aim of spectrum is set in majorized function, carries out Automatic Optimal.Two prisms respectively the preceding of plane grating and after, it is crooked that the drift angle value of prism is used for proofreading and correct beam splitting system spectrum.
The lens of described convergent mirror group 4 are spherical lens, are used to assemble diffracted beam, proofread and correct the spherical aberration of collimating mirror 2 introducings and other aberration of beam splitting system simultaneously.Spectrum groupware 3 has certain included angle θ with convergent mirror group 4 at optical axis direction, and this angle is set to optimized amount, carries out Automatic Optimal and proofreaies and correct remaining spectrum bending in the beam splitting system.
Described optical filter 5, the position and the wavelength of the second order spectrum that produces through spectrum groupware 3 according to selected wave band adopt before the local surfaces plating cut film second order spectrum that disappears.
The advantage of optical system of the present invention is:
1. system architecture is compact, processing, the dress gyp maturation of planting.
2. adopt catadioptric formula light channel structure, collimating mirror adopts concave spherical mirror, has reduced optical element, has improved the optical efficiency of system, with the combination of convergent mirror group, is easy to accomplish big object space numerical aperture, the design of long linear field.
3. spectrum groupware adopts prism-grating-prism, and the drift angle of prism is crooked as optimization variable recoverable system spectrum, also can obtain linear dispersion spectrum; Spectrum groupware and the angle of convergent mirror group on optical axis direction are crooked as remaining spectrum in the optimization variable recoverable system; Adopt the plane reflection grating, spectral coverage selects not receive the restriction of grating material.
Description of drawings
Fig. 1 is the structural representation of spectrometer optical system.
Fig. 2 is the light path synoptic diagram of spectrometer optical system;
Among the figure:
1 is field stop and light beam steering assembly; 2 is collimating mirror;
3 is spectrum groupware; 4 is the convergent mirror group;
5 is optical filter; 6 is image planes;
7 is field stop; 8 is plane mirror.
Embodiment
According to the structural representation of Fig. 1, designed the catadioptric formula spectrometer optical system of one prism-grating-prismatic decomposition, image quality is near diffraction limit, and the spectrum bending is low.The optical system index is listed in table 1, and the concrete design parameter of optical system is listed in table 2.
Table 1
Claims (4)
1. the catadioptric formula imaging spectrometer optical system of prism-grating-prismatic decomposition, it is made up of field stop and light beam steering assembly (1), collimating mirror (2), spectrum groupware (3), convergent mirror group (4) and optical filter (5), it is characterized in that:
Described field stop and light beam steering assembly (1) are fitted by field stop (7) and plane mirror (8) and are formed, and plane mirror 8 centers have the logical light groove of a rectangle, and the surface is coated with reflectance coating thereafter;
Described collimating mirror (2) is a concave spherical mirror;
Described spectrum groupware (3) is prism-grating-prism structure, and wherein grating is reflective plane grating, and first prism and second prism are respectively in the front and back of plane reflection grating, and spectrum groupware (3) has certain included angle with convergent mirror group (4) on optical axis direction;
The lens of described convergent mirror group (4) are spherical lens, are used to assemble diffracted beam, proofread and correct the spherical aberration of collimating mirror (2) introducing and other aberration of beam splitting system simultaneously;
Described optical filter (5) adopts before the local surfaces plating cut film second order spectrum that disappears;
From beam emissions to the collimating mirror (2) that field stop (7) is sent, turn back to spectrum groupware (3) through plane mirror (8) after the beam collimation, assemble by convergent mirror group (4), after optical filter (5) disappears second order spectrum, go up imaging on picture plane (6).
2. the catadioptric formula imaging spectrometer optical system of a kind of prism-grating according to claim 1-prismatic decomposition is characterized in that: the grating line of the plane reflection grating in the described spectrum groupware (3) is several to be confirmed according to the dimension of the spectrum on convergent mirror group focal length and photosurface length.
3. the catadioptric formula imaging spectrometer optical system of a kind of prism-grating according to claim 1-prismatic decomposition is characterized in that: it is crooked that the drift angle of two prisms in the described spectrum groupware (3) is used for proofreading and correct beam splitting system spectrum.
4. the catadioptric formula imaging spectrometer optical system of a kind of prism-grating according to claim 1-prismatic decomposition is characterized in that: described spectrum groupware (3) is used for proofreading and correct remaining spectrum bending in the beam splitting system with the angle of convergent mirror group (4) on optical axis direction.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134587A (en) * | 2013-01-29 | 2013-06-05 | 北京理工大学 | Spectrum light splitting imaging system light path based on volume hologram grating component light splitting |
| CN104535184A (en) * | 2014-12-22 | 2015-04-22 | 中国科学院长春光学精密机械与物理研究所 | Light path structure of prism-grating imaging spectrometer |
| CN104969043A (en) * | 2012-11-15 | 2015-10-07 | 康宁股份有限公司 | Hyperspectral imaging systems and methods for imaging a remote object |
| WO2019015439A1 (en) * | 2017-07-20 | 2019-01-24 | 无锡海斯凯尔医学技术有限公司 | Device for fast spectral imaging of tissue molecule |
| CN110081976A (en) * | 2019-05-21 | 2019-08-02 | 中国科学院光电研究院 | A kind of big visual field grating prism spectrum imaging system |
| CN112284538A (en) * | 2020-09-15 | 2021-01-29 | 中国科学院上海技术物理研究所 | Optical system of prism grating spectrometer and design method |
| CN112437886A (en) * | 2018-06-07 | 2021-03-02 | 博莱佳私人有限公司 | Light beam direction finder |
| CN114594587A (en) * | 2020-12-07 | 2022-06-07 | 中国科学院长春光学精密机械与物理研究所 | Ultraviolet sky-patrol optical imaging system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104969043A (en) * | 2012-11-15 | 2015-10-07 | 康宁股份有限公司 | Hyperspectral imaging systems and methods for imaging a remote object |
| CN103134587A (en) * | 2013-01-29 | 2013-06-05 | 北京理工大学 | Spectrum light splitting imaging system light path based on volume hologram grating component light splitting |
| CN104535184A (en) * | 2014-12-22 | 2015-04-22 | 中国科学院长春光学精密机械与物理研究所 | Light path structure of prism-grating imaging spectrometer |
| WO2019015439A1 (en) * | 2017-07-20 | 2019-01-24 | 无锡海斯凯尔医学技术有限公司 | Device for fast spectral imaging of tissue molecule |
| CN112437886A (en) * | 2018-06-07 | 2021-03-02 | 博莱佳私人有限公司 | Light beam direction finder |
| CN110081976A (en) * | 2019-05-21 | 2019-08-02 | 中国科学院光电研究院 | A kind of big visual field grating prism spectrum imaging system |
| CN112284538A (en) * | 2020-09-15 | 2021-01-29 | 中国科学院上海技术物理研究所 | Optical system of prism grating spectrometer and design method |
| CN114594587A (en) * | 2020-12-07 | 2022-06-07 | 中国科学院长春光学精密机械与物理研究所 | Ultraviolet sky-patrol optical imaging system |
| CN114594587B (en) * | 2020-12-07 | 2023-06-09 | 中国科学院长春光学精密机械与物理研究所 | Optical imaging system for ultraviolet night-time |
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