CN101672978A - Catadioptric type off-axis three-reflector long-wave infrared optical system - Google Patents
Catadioptric type off-axis three-reflector long-wave infrared optical system Download PDFInfo
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- CN101672978A CN101672978A CN200910197305A CN200910197305A CN101672978A CN 101672978 A CN101672978 A CN 101672978A CN 200910197305 A CN200910197305 A CN 200910197305A CN 200910197305 A CN200910197305 A CN 200910197305A CN 101672978 A CN101672978 A CN 101672978A
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Abstract
The invention discloses a catadioptric type off-axis three-reflector long-wave infrared optical system for spaceborne or airborne ground observation. The optical system comprises an off-axis three-reflector system and a convertible lens group 4, wherein the off-axis three-reflector system comprises a concave reflector 1, a convex reflector 2 and a concave reflector 3; the three off-axis reflectorscan perfectly image, and the focus of each reflector is longer than the focus of the system; the convertible lens group is achromatic, and the amplification factor beta of the convertible lens groupis larger than or equal to 0.35 and less than or equal to 1; the focus of each of the three off-axis reflectors is shortened; and the relative aperture of the system is enlarged. The invention has simple structure and is mainly applied to long-wave infrared cameras in airborne or spaceborne ground imaging instruments.
Description
Technical field
The present invention relates to optical element, system, specifically be meant a kind ofly to be used for the airborne or spaceborne refraction-reflection of observing imager over the ground from the big visual field of axle three reflections object lens of large relative aperture LONG WAVE INFRARED optical system.
Background technology
In the LONG WAVE INFRARED imaging optical system, total transmissivity formula system is subjected to the restriction of optical material, and general bore is below Φ 200mm.The general structure that adopts coaxial two catoptron correction up lens combination of mirror-lens system, there is central obscuration in this structure, has reduced the MTF of system, and is not suitable for the application of the occasion of big visual field.Increase from axle three anti-systems along with relative aperture, its processing also increases with resetting difficulty.
In the Aero-Space remote sensing application, visual field separation vessel or colour esensitized equipment were placed by general shared reflecting telescope system in the hyperchannel camera before the telescope focal plane, were divided into visible light (VIS), near infrared (NIR), short-wave infrared (SWIR), LONG WAVE INFRARED (LWIR) passage.The resolution of LONG WAVE INFRARED passage generally is lower than visible near-infrared, the shortwave channel resolution.Therefore require this passage to have little focal length, object lens of large relative aperture.When visible near-infrared direct use during from axle three anti-imagings, the LONG WAVE INFRARED passage then needs improving dwindling from axle three anti-system focal lengths of imaging.
Summary of the invention
Based on the existence of the problems referred to above, the present invention proposes a kind of Catadioptric type off-axis three-reflector long-wave infrared optical system.The objective of the invention is:, realize the optical system of big visual field object lens of large relative aperture by behind axle three anti-mirror systems, adding change convertible lens group.The scope that becomes the enlargement ratio of convertible lens group is 0.35≤β≤1, thus by little relative aperture obtain the LONG WAVE INFRARED optical system of object lens of large relative apertures from axle three anti-mirror systems, also can be used in two grades of zoom LONG WAVE INFRARED systems.
The structure of Catadioptric type off-axis three-reflector long-wave infrared optical system of the present invention as shown in Figure 1, in order by catoptron 1, catoptron 2, catoptron 3, the imaging optical system that Zoom lens group 4 constitutes, it is characterized in that: with traditional adding Zoom lens group behind axle three anti-mirror systems, dwindle its focal length, increase relative aperture, keep the advantage of its big visual field simultaneously.
From the light beam process catoptron 1 of object space, directive convex reflecting mirror 2 again by 3 reflections of secondary aspherical catoptron, further converges at picture plane 5 with change convertible lens 4.
Said Catadioptric type off-axis three-reflector long-wave infrared optical system must satisfy following requirement:
1. what catoptron 1, catoptron 2, catoptron 3 were formed can improve imaging from axle three anti-mirror systems.
2. the scope that becomes the enlargement ratio of convertible lens group is 0.35≤β≤1.
The characteristics of optical system maximum of the present invention are exactly to add the Zoom lens groups what improve imaging from the anti-back of axle three, increase relative aperture.Assurance from axle three instead can debug separately with visible light finish after, add to become the convertible lens group, thereby the difficulty of debuging of the system of assurance does not improve.
Description of drawings
Fig. 1 is the Catadioptric type off-axis three-reflector long-wave infrared optical system structural drawing, and wherein: L1 is a distance between concave mirror 1 and the convex reflecting mirror 2; L2 is a distance between convex reflecting mirror 2 and the concave mirror 3; L3 is concave mirror 3 and becomes distance between the convertible lens group 4; L4 is a distance between refractor 4-1 and the refractor 4-2; L5 is a distance between refractor 4-2 and the refractor 4-3; L6 is a distance between refractor 4-3 and the image planes 5; D1 is that catoptron 1 departs from the systematic optical axis distance; D2 is that catoptron 3 departs from the systematic optical axis distance; D3 is for becoming the distance that convertible lens group 4 and object plane 5 depart from systematic optical axis; α is the angle from object space light and systematic optical axis; R411 is a refractor 4-1 front surface radius-of-curvature; R412 is a refractor 4-1 rear surface radius-of-curvature; R421 is a refractor 4-2 front surface radius-of-curvature; R422 is a refractor 4-2 rear surface radius-of-curvature; R431 is a refractor 4-3 front surface radius-of-curvature; R432 is a refractor 4-3 rear surface radius-of-curvature.
Fig. 2 be in the example from axle three anti-systems the optical transfer function curve map at visible light wave range (0.48 μ m～0.66 μ m).
Fig. 3 in the example from axle three is counter add the Zoom lens group after system at the optical transfer function curve map of 8.0 μ m～12.0 μ m.
Specific implementation method
By the optical system structure shown in the accompanying drawing 1 among the present invention, we have designed a LONG WAVE INFRARED optical system, and technical indicator is as follows:
Service band: 8.0 μ m～12.0 μ m
Bore: Φ 300mm
Visual field: ± 2.0 ° (linear field)
From axle three anti-F number: F/3.5
System F number: F/1.2
Concrete structure parameter designing result is attached in system, wherein sees Fig. 2 from the optical transfer function curve of axle three anti-systems, and the optical transfer function curve of system is seen Fig. 3 after the adding change convertible lens group.
Optical texture parameter designing result:
Claims (1)
1. Catadioptric type off-axis three-reflector long-wave infrared optical system, constitute object lens of large relative aperture LONG WAVE INFRARED optical system by concave mirror (1), convex surface reflection (2), concave mirror (3), change convertible lens group (4) successively by object space to the side's of elephant order, it is characterized in that:
A) reflect the big of (2), concave mirror (3) formation by concave mirror (1), convex surface, and can improve imaging alone from the more described refraction-reflection LONG WAVE INFRARED of axle three catoptron F numbers optical system;
B) described change convertible lens group (4) is the achromatic lens group, and lens wherein adopt sphere or non-spherical lens to eliminate aberration;
C) scope that becomes the attainable enlargement ratio of convertible lens group (4) is 0.35≤β≤1;
D) from the light beam process catoptron (1) of object space, directive convex reflecting mirror (2) again by secondary aspherical catoptron (3) reflection, further converges at picture plane (5) with change convertible lens (4).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910197305A CN101672978A (en) | 2009-10-16 | 2009-10-16 | Catadioptric type off-axis three-reflector long-wave infrared optical system |
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| CN200910197305A CN101672978A (en) | 2009-10-16 | 2009-10-16 | Catadioptric type off-axis three-reflector long-wave infrared optical system |
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| CN101672978A true CN101672978A (en) | 2010-03-17 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087408A (en) * | 2010-12-30 | 2011-06-08 | 中国科学院长春光学精密机械与物理研究所 | Triple reflection type optical system with large view field, ultra low distortion and multiple spectrums |
| CN102393559A (en) * | 2011-12-07 | 2012-03-28 | 四川九洲电器集团有限责任公司 | Athermal catadioptric homocentric optical system |
| RU2461030C1 (en) * | 2011-05-18 | 2012-09-10 | Открытое акционерное общество "Красногорский завод им. С.А. Зверева" | Catadioptric lens (versions) |
| CN103293697A (en) * | 2013-06-21 | 2013-09-11 | 中科院南京天文仪器有限公司 | Large-visual-field off-axis prime focus type collimator optical system |
| CN106772936A (en) * | 2016-12-08 | 2017-05-31 | 北京控制工程研究所 | One kind miniaturization Rotating Platform for High Precision Star Sensor optical system |
| RU2631531C1 (en) * | 2016-05-10 | 2017-09-25 | Публичное акционерное общество "Красногорский завод им. С.А. Зверева" | Mirror-lensed objective for work in near ir-spectral range |
| CN107728316A (en) * | 2017-09-18 | 2018-02-23 | 天津大学 | With the Equivalent analysis method of off-axis three reflecting optical systems imaging law |
| CN108226901A (en) * | 2018-02-06 | 2018-06-29 | 北京万集科技股份有限公司 | Laser radar optical system |
| CN108237436A (en) * | 2017-12-19 | 2018-07-03 | 中国科学院西安光学精密机械研究所 | A kind of manufacturing method of off-axis three anti-system of full free form surface |
| CN108345090A (en) * | 2018-03-23 | 2018-07-31 | 杭州有人光电技术有限公司 | A kind of full HD projection lens of L-type short focus of F numbers |
| CN110764241A (en) * | 2019-11-29 | 2020-02-07 | 中国科学院长春光学精密机械与物理研究所 | Multi-focus distance axis three-reflection imaging optical system |
| CN113484845A (en) * | 2021-05-22 | 2021-10-08 | 桂林理工大学 | Unmanned aerial vehicle-oriented light and small off-axis four-reflection type laser radar optical receiving device |
| CN113687500A (en) * | 2021-08-03 | 2021-11-23 | 润坤(上海)光学科技有限公司 | Refractive detector optical system |
-
2009
- 2009-10-16 CN CN200910197305A patent/CN101672978A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087408A (en) * | 2010-12-30 | 2011-06-08 | 中国科学院长春光学精密机械与物理研究所 | Triple reflection type optical system with large view field, ultra low distortion and multiple spectrums |
| RU2461030C1 (en) * | 2011-05-18 | 2012-09-10 | Открытое акционерное общество "Красногорский завод им. С.А. Зверева" | Catadioptric lens (versions) |
| CN102393559A (en) * | 2011-12-07 | 2012-03-28 | 四川九洲电器集团有限责任公司 | Athermal catadioptric homocentric optical system |
| CN102393559B (en) * | 2011-12-07 | 2013-12-04 | 四川九洲电器集团有限责任公司 | Athermal catadioptric homocentric optical system |
| CN103293697A (en) * | 2013-06-21 | 2013-09-11 | 中科院南京天文仪器有限公司 | Large-visual-field off-axis prime focus type collimator optical system |
| RU2631531C1 (en) * | 2016-05-10 | 2017-09-25 | Публичное акционерное общество "Красногорский завод им. С.А. Зверева" | Mirror-lensed objective for work in near ir-spectral range |
| CN106772936B (en) * | 2016-12-08 | 2019-06-18 | 北京控制工程研究所 | A kind of miniaturization Rotating Platform for High Precision Star Sensor optical system |
| CN106772936A (en) * | 2016-12-08 | 2017-05-31 | 北京控制工程研究所 | One kind miniaturization Rotating Platform for High Precision Star Sensor optical system |
| CN107728316B (en) * | 2017-09-18 | 2019-11-29 | 天津大学 | With the Equivalent analysis method of off-axis three reflecting optical systems imaging law |
| CN107728316A (en) * | 2017-09-18 | 2018-02-23 | 天津大学 | With the Equivalent analysis method of off-axis three reflecting optical systems imaging law |
| CN108237436A (en) * | 2017-12-19 | 2018-07-03 | 中国科学院西安光学精密机械研究所 | A kind of manufacturing method of off-axis three anti-system of full free form surface |
| CN108226901A (en) * | 2018-02-06 | 2018-06-29 | 北京万集科技股份有限公司 | Laser radar optical system |
| CN108226901B (en) * | 2018-02-06 | 2024-03-01 | 武汉万集光电技术有限公司 | Laser radar optical system |
| CN108345090A (en) * | 2018-03-23 | 2018-07-31 | 杭州有人光电技术有限公司 | A kind of full HD projection lens of L-type short focus of F numbers |
| CN110764241A (en) * | 2019-11-29 | 2020-02-07 | 中国科学院长春光学精密机械与物理研究所 | Multi-focus distance axis three-reflection imaging optical system |
| CN113484845A (en) * | 2021-05-22 | 2021-10-08 | 桂林理工大学 | Unmanned aerial vehicle-oriented light and small off-axis four-reflection type laser radar optical receiving device |
| CN113687500A (en) * | 2021-08-03 | 2021-11-23 | 润坤(上海)光学科技有限公司 | Refractive detector optical system |
| CN113687500B (en) * | 2021-08-03 | 2024-03-26 | 润坤(上海)光学科技有限公司 | Optical system of deflection type detector |
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Open date: 20100317 |