CN102507001B - 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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- CN102507001B CN102507001B CN201110316117.7A CN201110316117A CN102507001B CN 102507001 B CN102507001 B CN 102507001B CN 201110316117 A CN201110316117 A CN 201110316117A CN 102507001 B CN102507001 B CN 102507001B
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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 refer to a kind of refraction-reflection type imaging spectrometer optical system based on prism-grating-prism decomposition.
Background technology
Imaging spectrometer is a kind of instrument that is used for obtaining target two-dimensional space information and spectral information, with high spectral resolution, obtain the spectrum picture of target, be used for target to carry out detection and identify and elemental analysis etc., in fields such as national product, military affairs and scientific researches, be widely used.
Color dispersion-type spectrum imaging system generally has the 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 curved surface grating manufacturing cost are high.PGP structure is the array configuration of a kind of prism and grating, and grating is transmission-type body holographic phase grating, and grating substrate is a kind of gelatin mass, and front and rear surfaces is stained with cover glass.Be subject to the restriction of base material and technique, be difficult for obtaining the volume phase grating of the low groove number of wide spectrum.
Summary of the invention
Technology of the present invention is dealt with problems and is: some problems that exist based on above-mentioned prior art, the object of this invention is to provide a kind of refraction-reflection type imaging spectrometer optical system based on prism-grating-prism 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 as shown in Figure 1.Optical system is comprised of field stop and light beam steering assembly 1, collimating mirror 2, spectrum groupware 3, convergent mirror group 4 and optical filter 5.
The beam emissions of sending from field stop 7, to collimating mirror 2, is turned back to spectrum groupware 3 through plane mirror 8 after beam collimation, by convergent mirror group 4, is assembled, through optical filter 5, disappear after second order spectrum, and imaging in picture plane 6.
As shown in Figure 2, described field stop and light beam steering assembly 1 are formed by field stop 7 and plane mirror 8 laminatings, and plane mirror 8 centers have the logical light groove of a rectangle, and surface is coated with reflectance coating thereafter.
Described collimating mirror 2 is concave spherical mirror.
Described spectrum groupware 3 is prism-grating-prism form, its grating is reflective plane grating, the first prism and the second prism are distributed in respectively the front and back of plane reflection grating, and grating line is several to be determined according to the spectrum dimension length on convergent mirror group focal length and photosurface.In optical design software, on one side certain of prism can be set to dip plane, 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 are respectively in the front and rear of plane grating, and 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, for assembling 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 angle theta 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 beam splitting system.
Described optical filter 5, position and the wavelength of the second order spectrum producing through spectrum groupware 3 according to selected wave band, adopt before local surfaces plating the cut film second order spectrum that disappears.
The advantage of optical system of the present invention is:
1. system architecture is compact, processing, dress school technical maturity.
2. adopt refraction-reflection type 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 large 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 optimized 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 optimized variable recoverable system; Adopt plane reflection grating, spectral coverage selects not to be subject to the restriction of grating material.
Accompanying drawing explanation
Fig. 1 is the structural representation of spectrometer optical system.
Fig. 2 is the light path schematic diagram of spectrometer optical system;
In figure:
1 is field stop and light beam steering assembly; 2 is collimating mirror;
3 is spectrum groupware; 4 is 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 refraction-reflection type spectrometer optical system of a prism-grating-prism decomposition, image quality approaches diffraction limit, and spectrum bending is low.Optical system index is listed in table 1, and optical system specific design parameter is listed in table 2.
Table 1
Claims (4)
1. a refraction-reflection type imaging spectrometer optical system for prism-grating-prism decomposition, it is comprised 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 formed by field stop (7) and plane mirror (8) laminating, and plane mirror (8) center has the logical light groove of a rectangle, and surface is coated with reflectance coating thereafter;
Described collimating mirror (2) is concave spherical mirror;
Described spectrum groupware (3) is prism-grating-prism structure, wherein grating is reflective plane grating, the first prism and the second prism are respectively in the front and back of reflective plane grating, and spectrum groupware (3) has certain angle with convergent mirror group (4) on optical axis direction;
The lens of described convergent mirror group (4) are spherical lens, for assembling diffracted beam, proofread and correct the spherical aberration of collimating mirror (2) introducing and other aberration of spectrum groupware simultaneously;
Described optical filter (5), adopts before local surfaces plating the cut film second order spectrum that disappears;
The beam emissions of sending from field stop (7) is to collimating mirror (2), after beam collimation, through plane mirror (8), turn back to spectrum groupware (3), by convergent mirror group (4), assembled, through optical filter (5), disappear after second order spectrum, in the upper imaging of picture plane (6).
2. the refraction-reflection type imaging spectrometer optical system of a kind of prism-grating-prism decomposition according to claim 1, is characterized in that: the grating line of the reflective plane grating in described spectrum groupware (3) is several definite according to the spectrum dimension length on convergent mirror group focal length and photosurface.
3. the refraction-reflection type imaging spectrometer optical system of a kind of prism-grating-prism decomposition according to claim 1, is characterized in that: it is crooked that the drift angle of two prisms in described spectrum groupware (3) is used for correcting optical system spectrum.
4. the refraction-reflection type imaging spectrometer optical system of a kind of prism-grating-prism decomposition according to claim 1, is characterized in that: it is crooked that described spectrum groupware (3) and the angle of convergent mirror group (4) on optical axis direction are used in correcting optical system remaining spectrum.
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Families Citing this family (8)
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| US8599374B1 (en) * | 2012-11-15 | 2013-12-03 | Corning Incorporated | 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 |
| CN107361723B (en) * | 2017-07-20 | 2024-02-13 | 无锡海斯凯尔医学技术有限公司 | Quick tissue molecular spectrum imaging device |
| WO2019232585A1 (en) * | 2018-06-07 | 2019-12-12 | Baraja Pty Ltd | An optical beam director |
| 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 |
| 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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