CN101672694A - Optical system of spectroscopic imaging spectrometer of prism - Google Patents
Optical system of spectroscopic imaging spectrometer of prism Download PDFInfo
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- CN101672694A CN101672694A CN200910197304A CN200910197304A CN101672694A CN 101672694 A CN101672694 A CN 101672694A CN 200910197304 A CN200910197304 A CN 200910197304A CN 200910197304 A CN200910197304 A CN 200910197304A CN 101672694 A CN101672694 A CN 101672694A
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Abstract
The invention discloses an optical system of a spectroscopic short-wave infrared imaging spectrometer of a prism, which uses an off-axis lens to correct the aberration of a large field of view and simultaneously correct the bending and distortion of a slit, thereby avoiding the adoption of a large-caliber concentric lens and reducing the acquiring difficulty and the processing requirements of thelarge-caliber lens; a dispersing prism is used for correcting non-linear dispersion, thereby meeting the spectral resolution requirement; a reflecting film is plated on the back surface of the prism,light beams directly generate reflection from the prism, and a Littrow reflector is not used, thereby simplifying the structure and lightening the weight; and two off-axis aspheric reflectors are usedas optical elements for collimation and convergence, and the distortion is controlled by adjusting the off-axis angle and the focus of the spectrometer, thereby compensating the slit bending relatedto the wave length and reducing the residual aberration.
Description
Technical field:
The present invention relates to optical element and optical system, specifically be meant a kind of short-wave infrared spectrometer that uses in the space remote sensing short-wave infrared large visual field high resolution Hyper spectral Imaging instrument system, it is used to be implemented under the 1.43 degree visual fields, divides the spectral coverage imaging to 64 wave bands after 1 μ m～2.5 μ m (being the short-wave infrared wave band) chromatic dispersion.
Technical background:
The high resolving power hyperspectral imager can obtain the space geometry information and the spectral information of observed object simultaneously, has unique information and obtains and the feature identification ability.Hyperspectral imager has a wide range of applications at national economy, scientific research numerous areas as a kind of important earth observation means, and high-resolution hyperspectral imager also possesses the strategy and tactics reconnaissance capability.
Use more prismatic colours astigmatic image spectrometer architecture to see Fig. 1 for details at present, this structure is usually by forming behind two off-axis aspheric surface catoptrons, two dispersing prism gummeds.Gummed bubble, inseparable impurity and dust in the cemented prism photic zone directly affects the image quality of spectrometer, and its volume and weight increases in addition, and temperature sensitivity is also increased.The present invention has adopted one to optimize structure from axle spherical correction lens, utilizes a dispersing prism to reach system performance index.
Summary of the invention:
Purpose: the objective of the invention is to design the optical system of a short-wave infrared off-axis reflection prism spectrum instrument, adopted one, solved two cemented prisms because the influence that the gummed defective is brought from axle spherical correction lens and a dispersing prism.
Optical system light path figure of the present invention sees Fig. 2 for details.Ultimate principle is to become numerous ground light spectral lines to be imaged on the two-dimensional detector by the information that telescope obtains by the spectrometer chromatic dispersion, obtains the digitizing output image.
Imaging optical path is described and formed: terrestrial radiation incides telescope, obtains the ground scene image, and spectrometer is incided in the bar formula visual field that becomes qualification by entrance slit, with planar array detector receive entrance slit by the spectrum picture of chromatic dispersion.The line output spatial information of detector array, and row output spectrum information.Spectrometer is made up of two off-axis aspheric surface catoptrons, a dispersing prism and a correcting lens.Wherein collimate off axis reflector mirror 2 and imaging off axis reflector mirror 4 is respectively secondary hyperboloid, ellipsoid, their focal length distributes the focal length requirement that need take into full account total system, and respectively with beam collimation and convergence; The angle design of two faces of dispersing prism should satisfy the spectral resolution requirement of system, satisfies the crooked and non-linear requirement of spectrum of spectrum of system again, relatively other beam split mode advantage optical efficiency height that is beam split; The design of correcting lens is used for the aberration of the outer big linear field light beam of axis calibration, reduces the spectrum bending.
Advantage of the present invention:
(1) zoom ratio of this spectrometer design is 0.8, has increased telescopical focal length, has reduced telescopical optical design difficulty; Zoom ratio has effectively amplified slit width, has reduced light school difficulty.
(2) the chromatic dispersion rear optical system of spectrometer looses from axle flattened field disappearing image according to the heart far away and requires design.Adopt this optical system can obtain the image of big visual field through overcorrect, picture quality is better.In spectrometer entrance slit one side is telecentric optical system, can the independent light school, easily and telescope mate.
(3) near the focal plane place, adopt one,, in certain scope, regulate the distortion of spectrometer, avoided employing heavy caliber concentric lens by regulating from the axle amount from axle spherical correction lens.The spherical reflector recoverable curvature of field, also recoverable slit bending simultaneously.Control catoptron and power of lens in the design, the curvature of field that reduces to produce makes picture quality in allowed band.For fear of producing aberration, adopted the lens material of low-refraction.The crooked rise of high pairing each wavelength of the maximum slit of design result is close to the constant of 28.35 μ m.
(4) the chromatic dispersion rear optical system adopts the object lens of scaling up, designs according to regulating the crooked principle of distortion correction slit.Though can produce distortion with two anastigmatic design proposals of catoptron,, on the CCD image planes, can obtain the rectilinear picture by suitably regulating the distortion distribution that telescope adds spectrometer.The major parameter of control distortion is the focal length (being collimator, imager) of off-axis angle and spectrometer.Can partly compensate the slit bending relevant by the spectrometer distortion with wavelength.Under the situation of given entrance slit size, in the chromatic dispersion rear optical system,, reduce dispersion angle and visual field, space by increasing the focal length of collimator or imager, make residual aberration reach enough little.
(5) the spectrometer non-linear chromatic dispersion of having adopted a prismatic decomposition correction, to 28.5nm average out to 23.36nm, the chromatic dispersion width is 1.9217mm to the spectral resolution of each passage from 18.6nm, has satisfied spectral resolution and spectral width requirement.At prism back side plating reflectance coating, light beam directly reflects from prism, has cancelled Littrow mirror, simplifies the structure, and has alleviated weight.Adopt aspheric surface and lens, it is crooked and spectrum is non-linear to have significantly reduced spectrum.Adopt the grand function of optics software programming, handle in conjunction with late time data, convenient to calculate spectrum bending, spectrum non-linear etc.
(6) the optics tolerance is insensitive, has reduced the difficulty that optics processing and optics are debug.
(7) image planes of system are flat, do not need to add field lens, have reduced optical element quantity, have improved optical efficiency.
Description of drawings:
Fig. 1 is prismatic colours astigmatic image spectrometer architecture figure.
Fig. 2 is the light channel structure synoptic diagram of short-wave infrared spectrometer;
Among the figure: 1 is slit;
2 are collimation off axis reflector mirror;
3 is dispersing prism;
4 are imaging off axis reflector mirror;
5 is from axle spherical correction lens;
6 is image planes;
D1 is slit and collimation off axis reflector mirror 2 spacing distances;
D2 is collimation off axis reflector mirror 2 and imaging off axis reflector mirror 4 spacing distances;
D3 is collimation off axis reflector mirror 2 and dispersing prism 3 spacing distances;
D4 be imaging off axis reflector mirror 4 with from axle spherical correction lens 5 spacing distances;
D5 is from axle spherical correction lens 5 and image planes 6 spacing distances;
R1 is the vertex curvature radius of collimation off axis reflector mirror 2;
R2 is the vertex curvature radius of imaging off axis reflector mirror 4;
R3 is the rear surface radius-of-curvature from axle spherical correction lens 5;
e
1 2Be the secondary excentricity of collimation off axis reflector mirror 2 square;
e
2 2Be the secondary excentricity of imaging off axis reflector mirror 4 square.
Embodiment:
According to the optical texture of Fig. 1, we have designed a short-wave infrared spectrometer, and picture element is near diffraction limit, and the MTF of design is greater than 0.75.Systematic technical indicator such as table 1, optical system specific design parameter is as shown in table 2.
Claims (2)
1. the optical system of a prismatic decomposition short-wave infrared imaging spectrometer, comprise dispersing prism, catoptron and correcting lens, it is characterized in that: described optical system have in image planes (6) front one be used for the corrective system curvature of field and slit bending from axle spherical correction lens (5).
2. the optical system of a kind of prismatic decomposition short-wave infrared imaging spectrometer according to claim 1 is characterized in that: the described lens material that adopts low-refraction from axle spherical correction lens (5).
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| CN200910197304A CN101672694A (en) | 2009-10-16 | 2009-10-16 | Optical system of spectroscopic imaging spectrometer of prism |
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| CN200910197304A CN101672694A (en) | 2009-10-16 | 2009-10-16 | Optical system of spectroscopic imaging spectrometer of prism |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410878A (en) * | 2011-12-02 | 2012-04-11 | 中国科学院光电研究院 | Imaging spectrometer |
| CN103293682A (en) * | 2013-05-31 | 2013-09-11 | 中国科学院长春光学精密机械与物理研究所 | Light-splitting light path structure of broad-spectrum solar spectral irradiance monitor |
| CN103674246A (en) * | 2013-11-21 | 2014-03-26 | 中国科学院上海技术物理研究所 | Convex grating spectrometer with double-level spectra |
| CN103776785A (en) * | 2014-02-20 | 2014-05-07 | 上海师范大学 | Optical system of integrated portable ultra-miniaturization spectrometer |
| RU2521249C1 (en) * | 2012-12-19 | 2014-06-27 | Открытое акционерное общество "Красногорский завод им. С.А. Зверева" | Reflecting autocollimating spectrometer |
| CN104330158A (en) * | 2014-01-17 | 2015-02-04 | 中国科学院上海技术物理研究所 | Off-axis spherical sapphire prism medium wave infrared imaging spectrometer |
| CN106066307A (en) * | 2016-01-13 | 2016-11-02 | 中国科学院上海技术物理研究所 | A kind of compact high-resolution wide visual field spectrum imaging system |
| CN109100317A (en) * | 2018-09-11 | 2018-12-28 | 杭州因诺维新科技有限公司 | Photo-electric gas monitoring system and method |
| CN110221420A (en) * | 2019-06-16 | 2019-09-10 | 西安应用光学研究所 | Double-view field is total to off-axis three reflecting optical system in aperture and design method |
| CN111158158A (en) * | 2018-11-08 | 2020-05-15 | 三星电子株式会社 | Spectrometer optical system and semiconductor inspection device |
| CN112384770A (en) * | 2018-07-10 | 2021-02-19 | 诺斯克埃莱克特罗奥普体克公司 | Hyperspectral camera |
| CN113566963A (en) * | 2020-04-29 | 2021-10-29 | 高利通科技（深圳）有限公司 | Novel spectral analysis device and system |
| CN114280764A (en) * | 2021-12-27 | 2022-04-05 | 苏州大学 | Large-view-field spectral imaging method and system based on free-form surface prism |
| CN114994881A (en) * | 2022-06-24 | 2022-09-02 | 苏州大学 | Snapshot type spectrum confocal displacement sensor dispersion lens and design method thereof |
| CN117007183A (en) * | 2023-07-21 | 2023-11-07 | 西安工业大学 | Imaging spectrometer based on double-arm compensation |
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2009
- 2009-10-16 CN CN200910197304A patent/CN101672694A/en active Pending
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410878A (en) * | 2011-12-02 | 2012-04-11 | 中国科学院光电研究院 | Imaging spectrometer |
| RU2521249C1 (en) * | 2012-12-19 | 2014-06-27 | Открытое акционерное общество "Красногорский завод им. С.А. Зверева" | Reflecting autocollimating spectrometer |
| CN103293682A (en) * | 2013-05-31 | 2013-09-11 | 中国科学院长春光学精密机械与物理研究所 | Light-splitting light path structure of broad-spectrum solar spectral irradiance monitor |
| CN103674246A (en) * | 2013-11-21 | 2014-03-26 | 中国科学院上海技术物理研究所 | Convex grating spectrometer with double-level spectra |
| CN103674246B (en) * | 2013-11-21 | 2016-01-13 | 中国科学院上海技术物理研究所 | A kind of twin-stage time spectrum convex grating spectrometer |
| CN104330158A (en) * | 2014-01-17 | 2015-02-04 | 中国科学院上海技术物理研究所 | Off-axis spherical sapphire prism medium wave infrared imaging spectrometer |
| CN103776785A (en) * | 2014-02-20 | 2014-05-07 | 上海师范大学 | Optical system of integrated portable ultra-miniaturization spectrometer |
| CN106066307A (en) * | 2016-01-13 | 2016-11-02 | 中国科学院上海技术物理研究所 | A kind of compact high-resolution wide visual field spectrum imaging system |
| CN112384770A (en) * | 2018-07-10 | 2021-02-19 | 诺斯克埃莱克特罗奥普体克公司 | Hyperspectral camera |
| CN112384770B (en) * | 2018-07-10 | 2024-04-30 | 诺斯克埃莱克特罗奥普体克公司 | Hyperspectral camera |
| CN109100317A (en) * | 2018-09-11 | 2018-12-28 | 杭州因诺维新科技有限公司 | Photo-electric gas monitoring system and method |
| CN111158158A (en) * | 2018-11-08 | 2020-05-15 | 三星电子株式会社 | Spectrometer optical system and semiconductor inspection device |
| CN111158158B (en) * | 2018-11-08 | 2023-04-25 | 三星电子株式会社 | Spectrometer optical system and semiconductor inspection device |
| CN110221420B (en) * | 2019-06-16 | 2021-03-30 | 西安应用光学研究所 | Double-field-of-view common-aperture off-axis three-mirror optical system and design method |
| CN110221420A (en) * | 2019-06-16 | 2019-09-10 | 西安应用光学研究所 | Double-view field is total to off-axis three reflecting optical system in aperture and design method |
| CN113566963A (en) * | 2020-04-29 | 2021-10-29 | 高利通科技（深圳）有限公司 | Novel spectral analysis device and system |
| CN114280764A (en) * | 2021-12-27 | 2022-04-05 | 苏州大学 | Large-view-field spectral imaging method and system based on free-form surface prism |
| CN114280764B (en) * | 2021-12-27 | 2023-12-08 | 苏州大学 | Free-form surface prism-based large-view-field spectroscopic imaging method and system |
| CN114994881A (en) * | 2022-06-24 | 2022-09-02 | 苏州大学 | Snapshot type spectrum confocal displacement sensor dispersion lens and design method thereof |
| CN114994881B (en) * | 2022-06-24 | 2023-07-25 | 苏州大学 | Snapshot type spectral confocal displacement sensor dispersion lens and design method thereof |
| CN117007183A (en) * | 2023-07-21 | 2023-11-07 | 西安工业大学 | Imaging spectrometer based on double-arm compensation |
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Open date: 20100317 |