CN102279047B - Telecentric imaging system with field of view of 15 degrees and three coaxial reflectors - Google Patents
Telecentric imaging system with field of view of 15 degrees and three coaxial reflectors Download PDFInfo
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- CN102279047B CN102279047B CN 201110079020 CN201110079020A CN102279047B CN 102279047 B CN102279047 B CN 102279047B CN 201110079020 CN201110079020 CN 201110079020 CN 201110079020 A CN201110079020 A CN 201110079020A CN 102279047 B CN102279047 B CN 102279047B
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- mirror
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- coaxial
- aperture diaphragm
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Abstract
The invention provides a telecentric imaging system with field of view of 15 degrees and three coaxial reflectors, belongs to the space optics technical field, and relates to a telecentric off-axis three-reflector imaging system. A technical problem to be solved is providing a telecentric imaging system with field of view of 15 degrees and three coaxial reflectors. A technical scheme is as follows: the imaging system comprises a main mirror, a second mirror, a third mirror, an aperture diaphragm and an imaging surface, the main mirror, the second mirror, the third mirror and the aperture diaphragm are coaxial, and the main mirror and the third mirror are coplanar; the second mirror is placed on a reflected light path of the main mirror, the third mirror is placed on a reflected light path of the second mirror, and the aperture diaphragm is placed on a mirror plane edge of the second mirror; in order to realize telecentric image space, a distance from the aperture diaphragm to the third mirror is half of a summit radius of curvature length of the third mirror; in order to realize wide field of view of 15 degrees, the second mirror is a convex spherical mirror, and the main mirror and the third mirror are concave quarticsurface mirrors; a distance from the second mirror to the third mirror is larger than half of a system image space focal length. According to the system, abundant ground resource information is obtained, and the system has low processing and adjusting difficulty.
Description
Technical field
The invention belongs to a kind of heart far away for multi-spectral imager and the preposition optical imaging system of imaging spectrometer of relating in the space optics technical field from the anti-mirror imaging system of axle three.
Background technology
Imaging spectrometer is a kind of advanced person's that optical imaging system and spectrum beam splitting system are organically combined optical sensor, can obtain simultaneously space characteristics and the spectral signature of target, comprehensive survey and the identification of realization to target property has in fields such as science, resource investigation and economic construction very widely and uses.
The preposition optical imaging system of imaging spectrometer and rearmounted spectrum beam splitting system are all the hearts far away.With respect to transmission-type imaging system and reflective imaging system have simple in structure, no color differnece, spectral range wide, can realize the characteristics such as high resolving power and high-energy utilization factor.Simultaneously, from axle three anti-system have without block, the characteristics such as wide visual field, picture element are good, compact conformation, be widely used in the earth observation from space imaging, be the first-selection of the preposition optical imaging system of imaging spectrometer.
the prior art the most approaching with the present invention, that Changchun Institute of Optics, Fine Mechanics and Physics, CAS is in the patent of invention of first to file, application number is 201010599531.9, denomination of invention is " heart far away that three coaxial field angle of catoptron are 10 ° is from the anti-mirror imaging system of axle three ", as shown in Figure 1, comprise primary mirror 1, secondary mirror 2, three mirrors 3 and aperture diaphragm 4, primary mirror 1, secondary mirror 2, three mirrors 3 and aperture diaphragm 4 four are coaxial, its primary mirror 1 is recessed hyperbolic mirror, secondary mirror 2 is protruding spherical mirror, three mirrors 3 are recessed oblate spheroid mirror, secondary mirror 2 is placed on the reflected light path of primary mirror 1, three mirrors 3 are placed on the reflected light path of secondary mirror 2, aperture diaphragm 4 is placed on secondary mirror 2, the distance of aperture diaphragm 4 to three mirrors 3 is half of three mirror 3 vertex curvature radius length, 5 is the image planes of imaging system.
Although this imaging system can reach the field angle of 10 °, but can not satisfy some special applications to the requirement of visual field width, the visual field width is related to the imaging system width of imaging observation picture over the ground, has determined the size of the resource information amount that imaging spectrometer obtains.
Summary of the invention
The defective that exists in order to overcome prior art, the object of the invention is to: under the assurance system heart far away, flattened field, diffraction limit modulation transfer function and the coaxial prerequisite of three catoptrons, enlarge as much as possible from the field angle of the anti-mirror imaging system of axle three, obtaining more information resources, a kind of field angle of ad hoc meter is that the coaxial heart far away of 15 ° of three catoptrons is from the anti-mirror imaging system of axle three.
The technical problem to be solved in the present invention is: provide a kind of 15 ° of visual fields heart far away three coaxial imaging systems of catoptron.The technical scheme of technical solution problem is as shown in Figure 2: comprise primary mirror 6, secondary mirror 7, three mirrors 8, aperture diaphragm 9, image planes 10; Primary mirror 6, secondary mirror 7, three mirrors 8 and aperture diaphragm 9 four are coaxial, and both are coplanar for primary mirror 6 and three mirrors 8; Secondary mirror 7 is placed on the reflected light path of primary mirror 6, and three mirrors 8 are placed on the reflected light path of secondary mirror 7, and aperture diaphragm 9 is placed on the front minute surface of secondary mirror 7 edge; If the dependency structure parameter of the imaging system that three catoptrons of the heart far away are coaxial: f ' is picture side's focal length of the coaxial imaging system of three catoptrons of the heart far away, R
1, R
2And R
3Be respectively the vertex curvature radius of primary mirror 6 reflectings surface, secondary mirror 7 reflectings surface and three mirror 8 reflectings surface, d
1, d
2And d
3Be respectively the distance of primary mirror 6 to secondary mirror 7, secondary mirror 7 to three mirrors 8 and three mirrors 8 to image planes 10; In order to realize as Fang Yuanxin, the distance of aperture diaphragm 9 to three mirrors 8 is half of three mirror 8 vertex curvature radius length, i.e. d
2=| R
3|/2; In order to realize the wide visual field of 15 °, secondary mirror 7 adopts protruding spherical mirrors, and primary mirror 6 and three mirrors 8 all adopt recessed quartic surface mirror, secondary mirror 7 to three mirrors 8 apart from d
2Greater than half of system picture side focal length, i.e. d
2| f ' |/2.
The principle of work explanation: primary mirror 6 receives the radiation in 15 ° of field angle and reflex on secondary mirror 7, and 15 ° of wide visual field radiation form the podiod picture far away of 15 ° of wide visual fields of scenery, ground successively through the reflection of secondary mirror 7 and three mirrors 8 on image planes 10.Because secondary mirror 7 adopts protruding spherical mirror, primary mirror 6 and three mirrors 8 all adopt recessed quartic surface mirror, and primary mirror 6, secondary mirror 7 and three mirrors 8 are coaxial, primary mirror 6 and three mirrors 8 are coplanar, the easy corrective system aberration of the structural arrangement of this near symmetrical, make the imaging system image quality at least 15 ° of visual fields near diffraction limit.
Good effect of the present invention: the coaxial heart far away of three catoptrons provided by the invention can reach more than 15 ° from the anti-mirror imaging system of axle three field angle, make the picture width of multi-spectral imager, imaging spectrometer earth observation bring up to original 1.5 times, from the earth observation ability that the aspect has improved multi-spectral imager, imaging spectrometer effectively of obtaining of resource information amount; Imaging system is coaxial configuration, and system's processing and resetting difficulty are little; The position of primary mirror 6 and three mirrors 8 overlaps, if primary mirror 6 reflectings surface and three mirror 8 reflector designs are processed on the same base material, the complicacy of further reduction system processing, debug system and be more prone to.
Description of drawings
Fig. 1 is the structural representation of prior art;
Fig. 2 is that the heart far away of the present invention is from the anti-mirror imaging system of axle three structural representation.
Embodiment
The present invention implements by structure shown in Figure 2.Wherein, choose picture side's focal distance f '=-720mm, relative aperture D/F=1/4, visual field off-axis angle are 8 °, the vertex curvature radius R of primary mirror 6 reflectings surface
1=-1846.21236mm, the vertex curvature radius R of secondary mirror 7 reflectings surface
2=-566.92974mm, the vertex curvature radius R of three mirror 8 reflectings surface
3=-809mm, primary mirror 6 to secondary mirror 7 apart from d
1=-404.5mm, secondary mirror 7 to three mirrors 8 apart from d
2=404.5mm, three mirrors 8 to image planes 10 apart from d
3=-666.26761mm, the asphericity coefficient e of primary mirror 6 reflectings surface
1 2=4.44886, e
1 4=2.56243e-011, the asphericity coefficient e of secondary mirror 7 reflectings surface
2 2The asphericity coefficient e of=0, three mirror 8 reflectings surface
3 2=-0.23399, e
3 4=-1.41839e-011 can obtain three coaxial imaging systems of catoptron of comparatively ideal 15 ° of visual fields heart far away like this.
Claims (1)
1. three coaxial imaging systems of catoptron of 15 ° of visual fields heart far away, comprise primary mirror (6), secondary mirror (7), three mirrors (8), aperture diaphragm (9), image planes (10); It is characterized in that primary mirror (6), secondary mirror (7), three mirrors (8) and aperture diaphragm (9) four are coaxial, both are coplanar for primary mirror (6) and three mirrors (8), secondary mirror (7) is placed on the reflected light path of primary mirror (6), three mirrors (8) are placed on the reflected light path of secondary mirror (7), and aperture diaphragm (9) is placed on the front minute surface of secondary mirror (7) edge; The dependency structure parameter of the imaging system that three catoptrons of this heart far away are coaxial is: f ' is picture side's focal length of the coaxial imaging system of three catoptrons of the heart far away, R
1, R
2And R
3Be respectively the vertex curvature radius of primary mirror (6) reflecting surface, secondary mirror (7) reflecting surface and three mirrors (8) reflecting surface, d
1, d
2And d
3Be respectively primary mirror (6) and arrive the distance of image planes (10) to three mirrors (8) and three mirrors (8) to secondary mirror (7), secondary mirror (7); Aperture diaphragm (9) is half of three mirrors (8) vertex curvature radius length, i.e. d to the distance of three mirrors (8)
2=| R
3|/2, secondary mirror (7) adopts protruding spherical mirror, primary mirror (6) and three mirrors (8) all adopt recessed quartic surface mirror, secondary mirror (7) to three mirrors (8) apart from d
2Greater than half of system picture side focal length, i.e. d
2| f ' |/2.
Priority Applications (1)
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| CN 201110079020 CN102279047B (en) | 2011-03-31 | 2011-03-31 | Telecentric imaging system with field of view of 15 degrees and three coaxial reflectors |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110079020 CN102279047B (en) | 2011-03-31 | 2011-03-31 | Telecentric imaging system with field of view of 15 degrees and three coaxial reflectors |
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| CN102279047A CN102279047A (en) | 2011-12-14 |
| CN102279047B true CN102279047B (en) | 2013-06-19 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809278B (en) * | 2012-11-06 | 2016-09-14 | 清华大学 | Off-axis three anti-mirrors |
| CN103018890B (en) * | 2012-12-14 | 2015-06-10 | 中国科学院长春光学精密机械与物理研究所 | Optical system with four coaxial reflecting mirrors for 20-degree view field without central obscuration |
| CN104898262B (en) * | 2014-03-05 | 2017-05-17 | 清华大学 | Free-form surface off-axis three-mirror optical system |
| CN104656235B (en) * | 2015-02-13 | 2017-04-05 | 中国科学院长春光学精密机械与物理研究所 | A kind of off-axis three reflecting optical system of the wide rectangular field of long-focus |
| CN109143558B (en) * | 2018-10-11 | 2023-08-08 | 佛山科学技术学院 | Miniaturized all-weather star sensor optical system |
| CN110471173B (en) * | 2019-08-05 | 2021-05-11 | 同济大学 | Four-reflection medium wave infrared viewfinder optical system with diffraction surface |
| CN112068295B (en) * | 2020-08-12 | 2021-08-17 | 中国科学院西安光学精密机械研究所 | Off-axis reflection type internal focusing optical system |
| CN114563868B (en) * | 2022-04-29 | 2022-07-19 | 季华实验室 | Optical remote sensing ultra-wide imaging method and device based on TMA (three-dimensional mirror) and two-surface rotating and scanning reflector |
| CN116736551A (en) * | 2023-08-16 | 2023-09-12 | 浙江棱镜全息科技有限公司 | Aerial imaging system and electronic rearview mirror |
Citations (1)
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| CN101546030A (en) * | 2009-05-08 | 2009-09-30 | 中国科学院上海技术物理研究所 | Convex grating imaging optical system with variable amplification |
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|---|---|---|---|---|
| CN101546030A (en) * | 2009-05-08 | 2009-09-30 | 中国科学院上海技术物理研究所 | Convex grating imaging optical system with variable amplification |
Non-Patent Citations (4)
| Title |
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| 10°远心离轴三反消像散望远系统的光学设计;李欢 等;《光子学报》;20090930;第38卷(第9期);第2257-2258页，图3 * |
| 李欢 等.10°远心离轴三反消像散望远系统的光学设计.《光子学报》.2009,第38卷(第9期), |
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