CN102967560B - Double grating altogether light path broadband faces limit imaging spectral instrument system - Google Patents
Double grating altogether light path broadband faces limit imaging spectral instrument system Download PDFInfo
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- CN102967560B CN102967560B CN201210488017.7A CN201210488017A CN102967560B CN 102967560 B CN102967560 B CN 102967560B CN 201210488017 A CN201210488017 A CN 201210488017A CN 102967560 B CN102967560 B CN 102967560B
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Abstract
Double grating altogether light path broadband faces limit imaging spectral instrument system, relates to imaging spectral technology field, solves the difficult problem that the broadband, the great dynamic range that comprise ultraviolet band face limit imaging spectral detection.Comprise two broad band pass filters, telescope, entrance slit, collimating mirror, two plane gratings, imaging lens, plane turn back mirror and two face battle array focus planardetectors; First broad band pass filter and corresponding two passages of the second broad band pass filter, light through two passages is imaged on entrance slit through telescope, incide two plane gratings from the light of entrance slit outgoing respectively after collimating mirror collimation, incide after grating dispersion on imaging lens, light through a passage is imaged onto on first surface battle array focus planardetector through imaging lens, through another passage light through imaging lens imaging again through plane turn back mirror folding after be incident on second battle array focus planardetector.The present invention is applicable to space remote sensing atmospheric trace gas detection needs.
Description
Technical field
The present invention relates to imaging spectral technology field, be specifically related to the common light path broadband of a kind of double grating and face limit imaging spectral instrument system.
Background technology
Atmospheric trace gas detection is monitoring atmospheric environment and the important means of carrying out climatic study, facing limit imaging spectrometer is a kind of new spatial remote optical sensing instrument for atmospheric trace gas detection, have the advantages that spatial coverage is large and vertical resolution is high, be subject to the favor of scientist.In ultraviolet band, it is less with the change of facing limit height and wavelength that air faces limit spectral radiance, is about 10
2~ 10
3magnitude, therefore detection is relatively easy.But only at ultraviolet band, the detection of many Atmospheric components is restricted, and in order to realize the scientific goal of earth atmosphere environmental monitoring better, faces limit Detection Techniques in the urgent need to development broadband air, wave band is wider, and the kind of detectable atmospheric trace gas is more.But broadband air faces limit detection and faces large many of limit detection difficulty than ultraviolet air, it is very large with the variation range of facing limit height and wavelength that Major Difficulties to be in broadband that air faces limit spectral radiance, in the broadband scope (such as 280 ~ 1000nm) comprising ultraviolet band, face within the scope of the height 0 ~ 90km of limit, face limit spectral radiance change and reach 10
6magnitude, and the dynamic range of general photodetector (as ccd detector and photodiode detector) only has 10
3~ 10
4, detection requirement can not be met.Therefore broadband great dynamic range air in the urgent need to address faces the problem of limit imaging spectral detection.
Summary of the invention
The present invention is the problem that solution broadband great dynamic range faces limit imaging spectral detection, the object of this invention is to provide the common light path broadband of a kind of double grating and face limit imaging spectral instrument system, effectively can solve the problem that broadband great dynamic range atmospheric trace gas faces limit imaging spectral detection.
Double grating altogether light path broadband faces limit imaging spectral instrument system, comprises the first broad band pass filter, the second broad band pass filter, telescope, entrance slit, collimating mirror, the first plane grating, the second plane grating, imaging lens, plane turn back mirror, first surface battle array focus planardetector and second battle array focus planardetector; Light beam is corresponding to first passage and second channel respectively after the first broad band pass filter and the second broad band pass filter, collimated to collimating mirror by light beam outgoing after telescope and entrance slit of first passage, described light beam after collimation is incident to the first plane grating, and the light beam after the first plane grating dispersion is imaged on first surface battle array focus planardetector through imaging lens; Collimated to collimating mirror by the outgoing after telescope and entrance slit of second channel light beam, light beam through collimation incides on the second plane grating, and the light beam after the second plane grating dispersion is turned back after mirror folds through imaging lens and plane and is incident on second battle array focus planardetector.
Beneficial effect of the present invention: system of the present invention is faced limit spectral radiance the broadband that will detect and is divided into shortwave and long wave two wave bands, corresponding two passages respectively, two passages use the first plane grating and the second plane grating respectively, first plane grating and the second plane grating are all blazed gratings, there is higher diffraction efficiency, first plane grating and the second plane grating share telescope, entrance slit, collimating mirror and imaging lens, the structure of this double grating altogether light path reduces the volume and weight that broadband faces limit imaging spectrometer, be particularly suitable for space remote sensing application.
Accompanying drawing explanation
Fig. 1 is the structural representation that the common light path broadband of double grating of the present invention faces limit imaging spectral instrument system.
In figure, the 1, first broad band pass filter, the 2, second broad band pass filter, 3, first passage, 4, second channel, 5, telescope, 6, entrance slit, 7, the first plane grating, the 8, second plane grating, 9, collimating mirror, 10, imaging lens, 11, first surface battle array focus planardetector, 12, second battle array focus planardetector, 13, plane turns back mirror.
Embodiment
Embodiment one, composition graphs 1 illustrate present embodiment, double grating altogether light path broadband faces limit imaging spectral instrument system, utilize double grating altogether light path be divided into first passage 3 and second channel 4 two passages realize the detection of broadband great dynamic range, comprise the first broad band pass filter 1, second broad band pass filter 2, telescope 5, entrance slit 6, collimating mirror 9, first plane grating 7, second plane grating 8, imaging lens 10, plane turn back mirror 13, first surface battle array focus planardetector 11 and second battle array focus planardetector 12, described first broad band pass filter 1, the corresponding first passage 3 of second broad band pass filter 2, second channel 4, the light of first passage 1 and second channel 2 is imaged on entrance slit 6 through telescope 5, after collimating mirror 9 collimates, the first plane grating 7 is incided from the light of entrance slit 6 outgoing, on second plane grating 8, incide on imaging lens 10 after grating dispersion, the light of first passage 3 is imaged onto on first surface battle array focus planardetector 11 through imaging lens 10, the light of second channel 4 is turned back after mirror 13 folds through plane through imaging lens 10 imaging again and is incident on second battle array focus planardetector 12.
First passage 3 described in present embodiment and the detecting band of second channel 4 are determined by the transmission wave band of the first broad band pass filter 1 and the second broad band pass filter 2 respectively, the detecting band of first passage 3 is shortwave, light signal is weak, and the detecting band of second channel 4 is long wave, and light signal is strong.The detecting band of such as first passage 3 is 280 ~ 510nm, and the detecting band of second channel 4 is 505 ~ 1000nm.In order to balance the light signal of first passage 3 and second channel 4, the bore of first passage 3 is greater than the bore of second channel 4, and the bore of such as first passage 3 is 8.8mm, and the bore of second channel 4 is 4.6mm.Reach the object strengthening weak signal.
First passage 3 described in present embodiment and second channel 4 utilize the first plane grating 7 and the second plane grating 8, first plane grating 7 and the second plane grating 8 to share telescope 5, entrance slit 6, collimating mirror 9 and imaging lens 10 respectively.Telescope 5 is off axis paraboloid mirror, and the radius of such as telescope 5 is 137.6mm, and quadric surface coefficient is-1, is 16.86mm from axle amount.Collimating mirror 9 is off-axis aspheric mirror, and the radius of such as collimating mirror 9 is 324.8mm, and quadric surface coefficient is-2.667, is 19.23mm from axle amount.First plane grating 7 and the second plane grating 8 are blazed grating, such as the blaze wavelength of the first plane grating 7 is 350nm, incisure density is 300 g/mm, the blaze wavelength of the second plane grating 8 is 760nm, incisure density is 145 g/mm, and imaging lens 10 is off-axis aspheric mirror, and the radius of such as imaging lens 10 is 329.2mm, quadric surface coefficient is-1.764, is 48.02mm from axle amount.
First surface battle array focus planardetector 11 described in present embodiment and second battle array focus planardetector 12 are area array CCD detector, and such as area array CCD detector is the CCD47-20 of E2v company.
Embodiment two, present embodiment face limit imaging spectrometer systematic difference embodiment for the double grating described in embodiment one is total to light path broadband, and the detailed process of the present embodiment is:
Broadband face limit imaging spectrometer sight line aim at air face limit height tangential direction air observe, the air of the band of 2.4 ° × 0.02 ° faces limit radiation first broad band pass filter 1, second broad band pass filter 2 and is divided into two passages and incides on telescope 5, the wavelength band of first passage 3 is 280 ~ 510nm, the wavelength band of second channel 4 is 505 ~ 1000nm, the bore of first passage 3 is 8.8mm, the bore of second channel 4 is 4.6mm, reaches the object strengthening weak signal.The optical radiation of two passages is imaged on same entrance slit 6 through off axis paraboloid mirror telescope 5, and telescope 5 radius is 137.6mm, and entrance slit 6 is of a size of 2.88mm × 0.024mm.Incide the first plane grating 7 and the second plane grating 8 from the light of entrance slit 6 outgoing respectively after collimating mirror 9 collimates, incide on same imaging lens 10 after grating dispersion, first passage 3 is imaged onto on first surface battle array focus planardetector 11 through imaging lens 10, and second channel 4 is turned back after mirror 13 is turned back through plane through imaging lens 10 again and is imaged onto on second battle array focus planardetector 12.The blaze wavelength of the first plane grating 7 is 350nm, incisure density 300 g/mm, the blaze wavelength 760nm of the second plane grating 8, incisure density 145 g/mm.Collimating mirror 9 and imaging lens 10 are from axle hyperboloid, and quadric surface coefficient is respectively-2.667 and-1.766.The whole focal length facing limit imaging spectral instrument system is 68.8mm.The pixel dimension of first surface battle array focal plane detector 11, second battle array focal plane detector 12 is 26 μm × 26 μm, pixel number 512 × 512.
In present embodiment double grating altogether light path broadband face limit imaging spectrometer imaging spectral detection carried out to the air that air faces limit 0 ~ 90km, detecting band 280 ~ 1000nm, face limit vertical direction spatial resolution 3km, 280 ~ 505nm wave band, Spectral resolution 1nm, 510 ~ 100nm wave band, Spectral resolution 2nm.That faces limit detection instrument detection faces limit brightness with the reacting condition space distribution information of atmospheric trace gas facing limit height and wavelength, by facing the information analysis of marginal ray modal data and process to what obtain, can the vertical distribution information of inverting atmospheric trace gas, for atmosphere environment supervision and climatic study etc. provide significant data support.
Claims (5)
1. double grating altogether light path broadband face limit imaging spectral instrument system, comprise the first broad band pass filter (1), the second broad band pass filter (2), telescope (5), entrance slit (6), collimating mirror (9), the first plane grating (7), the second plane grating (8), imaging lens (10), plane turn back mirror (13), first surface battle array focus planardetector (11) and second battle array focus planardetector (12); It is characterized in that, light beam is corresponding to first passage (3) and second channel (4) respectively after the first broad band pass filter (1) and the second broad band pass filter (2), collimated to collimating mirror (9) by light beam outgoing after telescope (5) and entrance slit (6) of first passage (3), described light beam after collimation is incident to the first plane grating (7), and the light beam after the first plane grating (7) dispersion is imaged on first surface battle array focus planardetector (11) through imaging lens (10); Collimated to collimating mirror (9) by the outgoing after telescope (5) and entrance slit (6) of second channel (4) light beam, light beam through collimation incides on the second plane grating (8), and the light beam after the second plane grating (8) dispersion is turned back after mirror (13) folds through imaging lens (10) and plane and is incident on second battle array focus planardetector (12).
2. the common light path broadband of double grating according to claim 1 faces limit imaging spectral instrument system, it is characterized in that, described first broad band pass filter (1) is different with the transmission wave band of the second broad band pass filter (2), and first passage (3) is different with the bore of second channel (4).
3. the common light path broadband of double grating according to claim 1 faces limit imaging spectral instrument system, and it is characterized in that, described telescope (5) is off axis paraboloidal mirror.
4. the common light path broadband of double grating according to claim 1 faces limit imaging spectral instrument system, and it is characterized in that, described collimating mirror (9) is from axle hyperbolic mirror.
5. the common light path broadband of double grating according to claim 1 faces limit imaging spectral instrument system, and it is characterized in that, described imaging lens (10) is from axle hyperbolic mirror.
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| CN108106729B (en) * | 2017-12-01 | 2019-09-10 | 中国科学院长春光学精密机械与物理研究所 | A kind of total CCD spectrometer of double grating |
| CN110375851A (en) * | 2019-07-10 | 2019-10-25 | 中国科学院上海技术物理研究所 | A kind of high signal to noise ratio wide spectrum double aperture slit spectrometer |
| CN110763638B (en) * | 2019-11-12 | 2020-12-18 | 中国海洋大学 | Comprehensive optical monitoring system |
| CN114812396B (en) * | 2022-03-11 | 2024-03-12 | 智慧星空(上海)工程技术有限公司 | Spectrum confocal measurement system |
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| CN102109379A (en) * | 2010-12-14 | 2011-06-29 | 中国科学院长春光学精密机械与物理研究所 | Optical device for wide waveband plane grating dispersion type imaging spectrometer |
| CN102175605B (en) * | 2010-12-30 | 2012-09-19 | 中国科学院长春光学精密机械与物理研究所 | Filter type two-waveband small ultraviolet omnidirectional imager system |
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