CN102928077A - Optical system of two-channel common-path minimized broadband imaging spectrometer - Google Patents
Optical system of two-channel common-path minimized broadband imaging spectrometer Download PDFInfo
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- CN102928077A CN102928077A CN2012104879057A CN201210487905A CN102928077A CN 102928077 A CN102928077 A CN 102928077A CN 2012104879057 A CN2012104879057 A CN 2012104879057A CN 201210487905 A CN201210487905 A CN 201210487905A CN 102928077 A CN102928077 A CN 102928077A
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Abstract
The invention discloses an optical system of a two-channel common-path minimized broadband imaging spectrometer, and relates to the technical field of space optics, solving the problems that an optical system of a conventional broadband imaging spectrometer is complex in structure and large in size and weight. The system comprises a first broadband pass filter, a second broadband pass filter, a first aperture diaphragm, a second aperture diaphragm, a telescope, an incidence slit, a first collimating mirror, a second collimating mirror, a plane grating, an imaging mirror and a detection image surface, wherein a light beam emitted from one same target is split into two channels through the first broadband pass filter and the second broadband pass filter, transmitted to the telescope through the first aperture diaphragm and the second aperture diaphragm, and subsequently imaged to the inclination slit through the telescope; after being emitted through the inclination slit, the light beam is transmitted to different areas of the plane grating through the first collimating mirror and the second collimating mirror, subjected to plane grating dispersion, transmitted to the imaging mirror, and subsequently imaged on one same detector image surface through the imaging mirror. The system is used in the aerospace and aviation atmospheric remote sensing field.
Description
Technical field
The present invention relates to the space optics technical field, be specifically related to a kind of reflective miniaturization broadband imaging spectrometer optical system in the space optics.
Background technology
Imaging spectrometer is the new spatial remote optical sensing instrument of collection of illustrative plates unification, in space atmospheric remote sensing, ocean remote sensing, the field such as investigation over the ground, is obtaining using more and more widely.Development along with the space remote sensing application, requirement to imaging spectrometer optical system is also more and more higher, wave band is more and more wider, expanded to ultraviolet band from visible waveband, wave band is wider, the spectral information of the target that comprises is just abundanter, realize that ultraviolet to visible broadband signal surveys simultaneously.In the fields such as broadband space atmospheric remote sensing that comprise ultraviolet band, for example at wave band 280～1000nm, face in the height 0～90km scope of limit, the dynamic range of signal reaches 10
5～10
6Magnitude.For realization is surveyed the broadband great dynamic range imaging spectral of target, at present, domestic and international existing broadband imaging spectrometer optical system adopts complicated scanning mirror mechanism and a plurality of color separation film, and volume and weight is large, is not suitable for space flight, airborne remote sensing application.
Summary of the invention
The problem that the present invention is the existing broadband imaging spectrometer complex structure of solution, volume and weight is large provides altogether light path miniaturization broadband imaging spectrometer optical system of a kind of binary channels.
Binary channels is light path miniaturization broadband imaging spectrometer optical system altogether, and this optical system comprises the first broad band pass filter, the second broad band pass filter, the first aperture diaphragm, the second aperture diaphragm, telescope, entrance slit, the first collimating mirror, the second collimating mirror, plane grating, imaging lens and detector image planes; The light beam of same target outgoing is divided into two passages through the first broad band pass filter and the second broad band pass filter and incides on the telescope through the first aperture diaphragm and the second aperture diaphragm respectively, be imaged onto on the entrance slit through telescope, described light beam is after the entrance slit outgoing, behind the first collimating mirror and the second collimating mirror, incide on the zones of different of plane grating respectively, after the plane grating dispersion, be incident to imaging lens, be imaged on the same detector image planes through imaging lens.
Principle of work of the present invention: the present invention be the target of broadband great dynamic range can blur-free imaging on the detector image planes of miniaturization imaging spectrometer, adopted the altogether system architecture of light path of binary channels, being divided into two passages surveys, two corresponding two wave bands of passage, the relative aperture of the aperture diaphragm of two passages can be selected as required.For realizing miniaturization and lightweight, two passages share same telescope, entrance slit, imaging lens and detector image planes.Two passages use respectively two zones of same grating, and the grating line density in two zones can be selected as required.Two passages respectively adopt a broad band pass filter to eliminate the impact of grating second order spectrum.This optical system is pressed xyz right hand space coordinates ordered arrangement, and the z direction of principal axis is decided to be optical axis direction, and the x axle is perpendicular to the yz plane, and the entrance slit length direction is along the length direction of y axle, and the plane grating dispersion direction is along the length direction of x axle.Imaging lens and detector image plane center be not or not the yz plane, and the center of all the other elements is in the yz plane.
Beneficial effect of the present invention: optical system of the present invention can realize comprising the broadband great dynamic range imaging spectral detection of ultraviolet band, and the dynamic range of detectable signal reaches 10
5～10
6, binary channels of the present invention is the light path system compact in design altogether, possesses miniaturization, light-weighted characteristics.
Description of drawings
Fig. 1 is the altogether structural representation of light path miniaturization broadband imaging spectrometer optical system of binary channels of the present invention.
Among the figure, the 1, first broad band pass filter, the 2, second broad band pass filter, the 3, first aperture diaphragm, 4, the second aperture diaphragm, 5, telescope, 6, entrance slit, the 7, first collimating mirror, 8, the second collimating mirror, 9, plane grating, 10, imaging lens, 11, the detector image planes.
Embodiment
Embodiment one, in conjunction with Fig. 1 present embodiment is described, binary channels is light path miniaturization broadband imaging spectrometer optical system altogether, this optical system comprises the first broad band pass filter 1, the second broad band pass filter 2, the first aperture diaphragm 3, the second aperture diaphragm 4, telescope 5, entrance slit 6, the first collimating mirror 7, the second collimating mirror 8, plane grating 9, imaging lens 10 and detector image planes 11, the light beam of described same target outgoing is divided into two passages through the first broad band pass filter 1 and the second broad band pass filter 2 and incides on the same telescope 5 through the first aperture diaphragm 3 and the first aperture diaphragm 4 respectively, be imaged onto on the entrance slit 6 through telescope 5, after entrance slit 6 outgoing, respectively through inciding behind the first collimating mirror 7 and the second collimating mirror 8 on two zoness of different of same plane grating 9, after plane grating 9 dispersions, be incident to imaging lens 10, be imaged on the same detector image planes 11 through imaging lens.
The relative arrangement of reflecting surface of the described telescope 5 of present embodiment and the first collimating mirror 7 and the second collimating mirror 8, the relative arrangement of diffraction surfaces of the reflecting surface of the first collimating mirror 7 and the second collimating mirror 8 and plane grating 9, the relative arrangement of reflecting surface of the diffraction surfaces of plane grating 9 and imaging lens 10, the reflecting surface of imaging lens 10 and the 11 relative arrangements of detector image planes.
The wavelength band of described two passages of present embodiment is respectively the transmission wave band of described the first broad band pass filter 1 and the second broad band pass filter 2.
The described telescope 5 of present embodiment is off axis paraboloidal mirror, and the first collimating mirror 7, the second collimating mirror 8 and imaging lens 10 are off-axis aspheric mirror.Two zoness of different of described plane grating 9 can be selected different grating line density as required.
Embodiment two, in conjunction with Fig. 1 present embodiment is described, present embodiment is the altogether application of light path miniaturization broadband imaging spectrometer optical system of embodiment one described binary channels, embodiment one described system applies is faced the limit imaging spectral in the space remote sensing atmosphere to be surveyed, the described imaging spectrometer optical system focal length of present embodiment 68.8mm, 2.4 ° * 0.02 ° of visual field, service band 280～1000nm.Atmosphere faces the limit scene and is divided into two passages through the first broad band pass filter 1, the second broad band pass filter 2 and incides on the telescope 5, the wavelength band of first passage is 280～540nm, the wavelength band of second channel is 535～1000nm, the bore of the first aperture diaphragm 3 is 8.8mm, the bore of the second aperture diaphragm 4 is 4.6mm, has reached the purpose that strengthens weak signal.Telescope 5 is off axis paraboloidal mirror, and radius-of-curvature is 137.6mm, and the quadric surface coefficient is-1, is 20.93 from the axle amount.Entrance slit 6 is of a size of 2.88mm * 0.024mm.The first collimating mirror 7 and the second collimating mirror 8 are that radius-of-curvature is 258.15mm from the axle quadric surface, and the quadric surface coefficient is 2.390, is respectively 51.47mm and 26.88mm from the axle amount.The incisure density in two zones of plane grating 9 is respectively 200g/mm, 365g/mm, and the size in two zones is respectively 19mm * 17mm, 19mm * 17mm.Imaging lens 10 is from the axle quadric surface, and radius-of-curvature is 257.427, and the quadric surface coefficient is-1.598, is 72.29mm from the axle amount.The whole focal length that faces limit imaging spectral instrument system is 68.8mm.First passage and second channel share detector image planes 11, obtain the digital picture of detector, detector image planes size 13.3mm * 13.3mm in the detector image planes.Present embodiment is by the spectral-transmission favtor of rational design the first broad band pass filter 1 and the second broad band pass filter 2, thereby the impact that can well suppress the second order spectrum of plane grating 9 reduces parasitic light.
The present invention can realize that broadband, great dynamic range Hyper spectral Imaging survey, be suitable as on the satellite and aircraft on the optical system of the broadband great dynamic range imaging spectrometer used, the fields such as space flight, aviation atmospheric remote sensing, earth observation.
Claims (7)
1. binary channels is total to light path miniaturization broadband imaging spectrometer optical system, and this optical system comprises the first broad band pass filter (1), the second broad band pass filter (2), the first aperture diaphragm (3), the second aperture diaphragm (4), telescope (5), entrance slit (6), the first collimating mirror (7), the second collimating mirror (8), plane grating (9), imaging lens (10) and detector image planes (11); It is characterized in that, the light beam of same target is divided into two passages through the first broad band pass filter (1) and the second broad band pass filter (2) and incides on the telescope (5) through the first aperture diaphragm (3) and the second aperture diaphragm (4) respectively, be imaged onto on the entrance slit (6) through telescope (5), described light beam is after entrance slit (6) outgoing, behind the first collimating mirror (7) and the second collimating mirror (8), incide on the zones of different of plane grating (9) respectively, after plane grating (9) dispersion, be incident to imaging lens (10), through imaging lens imaging (10) on same detector image planes (11).
2. binary channels according to claim 1 is total to light path miniaturization broadband imaging spectrometer optical system, it is characterized in that, the relative arrangement of reflecting surface of described telescope (5) and the first collimating mirror (7) and the second collimating mirror (8), the reflecting surface of the first collimating mirror (7) and the first collimating mirror (8) and relative arrangement of diffraction surfaces of plane grating (9), the relative arrangement of reflecting surface of the diffraction surfaces of plane grating (9) and imaging lens (10), the relative arrangement with detector image planes (11) of the reflecting surface of imaging lens (10).
3. binary channels according to claim 1 is total to light path miniaturization broadband imaging spectrometer optical system, it is characterized in that described the first aperture diaphragm (3) is different with the bore of the second aperture diaphragm (4).
4. binary channels according to claim 1 is total to light path miniaturization broadband imaging spectrometer optical system, it is characterized in that described telescope (5) is off axis paraboloidal mirror.
5. binary channels according to claim 1 is total to light path miniaturization broadband imaging spectrometer optical system, it is characterized in that described the first collimating mirror (7) and the second collimating mirror (8) are off-axis aspheric mirror.
6. binary channels according to claim 1 is total to light path miniaturization broadband imaging spectrometer optical system, it is characterized in that, described passage 1 and 2 uses the zones of different of same plane gratings (9).
7. binary channels according to claim 1 is total to light path miniaturization broadband imaging spectrometer optical system, it is characterized in that described imaging lens (10) is off-axis aspheric mirror.
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Cited By (8)
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| CN103292902A (en) * | 2013-05-29 | 2013-09-11 | 南京信息工程大学 | Dayglow temperature photometer and method thereof for detecting airglow spectrum intensity and temperature |
| CN103389159A (en) * | 2013-07-23 | 2013-11-13 | 中国科学院长春光学精密机械与物理研究所 | Prism and grating cascading dispersion two-channel and high-resolution spectrum imaging system |
| CN103592028A (en) * | 2013-10-29 | 2014-02-19 | 中国科学院长春光学精密机械与物理研究所 | Double-diffraction-level common-path detection grating spectrometer based on double-color detector |
| 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 |
| CN106895919A (en) * | 2016-12-30 | 2017-06-27 | 中国科学院长春光学精密机械与物理研究所 | A kind of double-channel spectrometer structure for minimizing the linkage of four gratings |
| CN110632058A (en) * | 2019-11-04 | 2019-12-31 | 宁波源禄光电有限公司 | Small light splitting device for Raman spectrum analysis |
| CN113865705A (en) * | 2021-08-25 | 2021-12-31 | 爱博能(广州)科学技术有限公司 | Shared light path dual-channel light path system and spectrometer |
| CN114199377A (en) * | 2021-08-23 | 2022-03-18 | 南开大学 | Near-infrared nanometer enhanced spectrometer |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103292902A (en) * | 2013-05-29 | 2013-09-11 | 南京信息工程大学 | Dayglow temperature photometer and method thereof for detecting airglow spectrum intensity and temperature |
| CN103389159A (en) * | 2013-07-23 | 2013-11-13 | 中国科学院长春光学精密机械与物理研究所 | Prism and grating cascading dispersion two-channel and high-resolution spectrum imaging system |
| CN103389159B (en) * | 2013-07-23 | 2015-02-18 | 中国科学院长春光学精密机械与物理研究所 | Prism and grating cascading dispersion two-channel and high-resolution spectrum imaging system |
| CN103592028A (en) * | 2013-10-29 | 2014-02-19 | 中国科学院长春光学精密机械与物理研究所 | Double-diffraction-level common-path detection grating spectrometer based on double-color detector |
| CN103592028B (en) * | 2013-10-29 | 2015-09-30 | 中国科学院长春光学精密机械与物理研究所 | Based on the double diffraction Ji Cigong road detection grating spectrograph of double-color detector |
| 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 |
| CN106895919A (en) * | 2016-12-30 | 2017-06-27 | 中国科学院长春光学精密机械与物理研究所 | A kind of double-channel spectrometer structure for minimizing the linkage of four gratings |
| CN110632058A (en) * | 2019-11-04 | 2019-12-31 | 宁波源禄光电有限公司 | Small light splitting device for Raman spectrum analysis |
| CN110632058B (en) * | 2019-11-04 | 2022-05-03 | 宁波源禄光电有限公司 | Small light splitting device for Raman spectrum analysis |
| CN114199377A (en) * | 2021-08-23 | 2022-03-18 | 南开大学 | Near-infrared nanometer enhanced spectrometer |
| CN114199377B (en) * | 2021-08-23 | 2023-12-05 | 南开大学 | Near infrared nano enhanced spectrometer |
| CN113865705A (en) * | 2021-08-25 | 2021-12-31 | 爱博能(广州)科学技术有限公司 | Shared light path dual-channel light path system and spectrometer |
| CN113865705B (en) * | 2021-08-25 | 2023-11-14 | 爱博能(广州)科学技术有限公司 | Dual-channel optical path system with shared optical path and spectrometer |
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