CN1432836A - Astigmatism eliminating three reflector system - Google Patents
Astigmatism eliminating three reflector system Download PDFInfo
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- CN1432836A CN1432836A CN 03104766 CN03104766A CN1432836A CN 1432836 A CN1432836 A CN 1432836A CN 03104766 CN03104766 CN 03104766 CN 03104766 A CN03104766 A CN 03104766A CN 1432836 A CN1432836 A CN 1432836A
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- 201000009310 astigmatism Diseases 0.000 title abstract 3
- 230000003287 optical effect Effects 0.000 claims abstract description 48
- 238000003384 imaging method Methods 0.000 claims description 9
- 238000011161 development Methods 0.000 abstract description 4
- 238000003754 machining Methods 0.000 abstract 1
- 230000000007 visual effect Effects 0.000 description 8
- 238000012545 processing Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 230000011514 reflex Effects 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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Abstract
The astigmatism eliminating three-reflector system provided by the present invention aims at facilitating the machining and regulation of reflective optical system and reducing its development cost. The astigmatism eliminating three-reflector system includes three, primary, secondary and the third, reflectors with one common optical axis, the primary reflector and the third reflector are spherical mirror, and the secondary reflector has quadric oblate spherical reflecting surface. It system also has ar aperture diaphragm, and has abxial working field of view. The parallel light beam incident to the primary reflector is thrice reflected in the primary reflector, secondary reflector and the third reflector successively to image in the image plane. The present invention is easy to regulate and low in cost, and has relatively working field of view.
Description
Technical field
The invention belongs to field of optical systems, relate in particular to a kind of reflective optic imaging system.
Background technology
Reflective astigmation free optical system generally designs by means of aspheric surface, in recent years along with the aspheric surface manufacturing process with debug the increasingly mature of technology, obtain application more and more widely, especially the reflective astigmation free optical system of long-focus is used aspect Aero-Space and is more seen more.General three-mirror reflective anastigmatic system is to study more one type, as in U.S. Pat 4,131,485, the three-mirror reflective anastigmatic system of mentioning in open day 26 days Dec in 1978 just adopts three secondary aspherical designs, under the situation that focal length is determined, have 7 undependent variables, can arrange anaberration and physical dimension preferably, also adopt high order aspheric surface in order to enlarge the design visual field sometimes, and dwindle physical dimension by means of the plane mirror folded optical path.And the U.S. Pat 6016220 that on January 18th, 2000 announced provides one from axle three trans systems, be made of secondary aspherical and high order aspheric surface plane correction plate, and the aperture has off-centre and inclination.Though the three-mirror reflective system can reach compact structure, bigger field angle, help the structure of eliminate stray light, is restricted to a great extent because of complicacy that the processing that its 3 aspheric surfaces are brought is debug and higher development cost after all.On May 22nd, 2002 disclosed publication number be in the Chinese patent of CN1350190A, an improved three-mirror reflective anastigmatic system has been proposed, it is designed to spherical reflector with one in 3 non-spherical reflectors in the three-mirror reflective system, and two other catoptron keeps secondary aspherical, but two non-spherical reflector processing and the difficulty of debuging are still very big, therefore, the development cost of long-focal distance optical system is high, is difficult to produce in batches.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of and have simultaneously that working field of view is big, image quality is higher, the resetting difficulty and the lower three-mirror reflective anastigmatic system of development cost of system in order to address the above problem.
In order to achieve the above object, the invention discloses a kind of three catoptron anastigmatic systems, comprise primary mirror, secondary mirror and three catoptrons of the 3rd mirror, it is characterized in that:
A. primary mirror and the 3rd mirror are spherical mirror in described three catoptrons, and the reflecting curved surface of secondary mirror is the secondary oblate spheroid, and the curved surface at three mirror optics face places has a common optical axis;
B. this system also comprises an aperture diaphragm, and described aperture diaphragm is positioned on the described secondary mirror or near the front and back light path the secondary mirror;
C. the optical axis of secondary mirror overlaps with common optical axis, and the clear aperature of described primary mirror and the 3rd mirror lays respectively at the both sides of common optical axis;
D. the working field of view of described anastigmatic system is from axle; Incide primary mirror with the parallel beam of optical axis deviation a angle, after primary mirror, secondary mirror and the 3rd mirror reflection, looking like planar imaging successively.
In order to shorten the system axial size, the mitigation system volume and weight, a kind of improvement of the present invention is as follows: three catoptron anastigmatic systems, comprise primary mirror, secondary mirror and three catoptrons of the 3rd mirror, it is characterized in that:
A. primary mirror and the 3rd mirror are spherical mirror in described three catoptrons, and the reflecting curved surface of secondary mirror is the secondary oblate spheroid, and the curved surface at three mirror optics face places has a common optical axis;
B. this system also comprises an aperture diaphragm and a folding plane mirror that is used for reflecting the secondary mirror emitting light path, and described aperture diaphragm is positioned on the described secondary mirror or near the front and back light path the secondary mirror;
C. the optical axis of secondary mirror overlaps with common optical axis, and the clear aperature of described primary mirror and the 3rd mirror lays respectively at the one or both sides of common optical axis;
D. the working field of view of described anastigmatic system is from axle; Incide primary mirror with the parallel beam of optical axis deviation a angle, after primary mirror, secondary mirror, folding plane mirror and the 3rd mirror reflection, looking like planar imaging successively.
Advantage of the present invention is:
1) all catoptrons have common optical axis, are beneficial to and debug, and have used the off-axis visual field, have eliminated and have blocked influence;
2) all optical surface shapes from the axle optical element are sphere (plane is the special case of sphere), owing to adopted the sphere design, therefore the processing of off axis reflector mirror just is converted into coaxial spherical mirror processing, difficulty of processing and cost have been reduced significantly, be fit to produce the also corresponding reduction of resetting difficulty in batches.
3) can shorten system's overall dimensions in focal length by means of folding plane mirror.
4) aspherisation of secondary mirror makes native system have equal image quality (MTF) and the working field of view of forming with three aspheric mirrors of catoptron anastigmatic system, and the catoptron anastigmatic system of forming than three spherical mirrors has higher image quality (MTF) and bigger working field of view; And secondary mirror is the axisymmetric secondary aspherical of size minimum in the system, and therefore, the processing and the detection difficulty of secondary mirror are less, improves system performance with less cost, has high cost performance.
The present invention carries out the anorthopia field in the Y direction and handles, there is off-axis visual field a, therefore working field of view is less on the Y direction, and the visual field on directions X is bigger, can be suitable for the detector of charge-coupled device (CCD) or integration time-delay charge-coupled image sensor types such as (TDI CCD), especially be fit to the linear array photoelectric detector.Its field angle can reach (10 ° * 1 °), for example is very practical for linear array push is swept the type remote sensor.
Description of drawings
Fig. 1 is the optical texture schematic layout pattern of three catoptron anastigmatic systems.
Fig. 2 is the optical texture schematic layout pattern of three catoptron anastigmatic systems of folding pattern.
1-primary mirror; 2-secondary mirror; 3-folding plane mirror; 4-the three mirror;
5-as the plane; 6-aperture diaphragm; 7-common optical axis; 8-incident beam;
D1-primary mirror 1 is to secondary mirror 2 spacings; D2-secondary mirror 2 is to plane mirror 3 spacings;
D3-plane mirror 3 to the 3rd mirrors 4 spacings; D4-the 3rd mirror 4 is to image planes 5 distances;
D5-secondary mirror 2 to the 3rd mirrors 4 distances.
Embodiment
Below by embodiment, the present invention is described in conjunction with the accompanying drawings.
Embodiment 1 is an Aero-Space push-scanning image optical system, its structural shape as shown in Figure 1:
Focal distance f '=500mm; Field angle is 10 ° * 1 °; Relative aperture is 1/12;
Overall dimensions: (900 * 300 * 120) mm
3Spectrum segment: (0.5-0.78) micron;
The system works visual field: directions X is (5 ° to 5 °); The Y direction is (5 ° to 6 °).
The structural parameters of primary mirror 1: radius-of-curvature is-1571.067mm (concave surface); Primary mirror time mirror spacing d1 is-446.731mm; Y from the axle amount is-102.48mm; Tilt quantity is 0; Coefficient of excentralization is 0; Clear aperature is (53.2 * 35.7) mm
2
The structural parameters of secondary mirror 2: radius-of-curvature is-473.5mm (convex surface); Coefficient of excentralization is 2.2510; Secondary mirror to the three mirror spacing d5 are 875mm; Y is 0 from the axle amount; Tilt quantity is 0; The clear aperature diameter is 10.7mm.
The structural parameters of the 3rd mirror 4: radius-of-curvature is-715.217mm (concave surface); The 3rd mirror to image planes apart from d4 is-455mm; Y is 194.376mm from the axle amount; Tilt quantity is 0; Coefficient of excentralization is 0; Clear aperature: (74.6 * 38.4) mm
2
The image quality of system is: when characteristic frequency be 50 lines right/when millimeter, full visual field full spectral coverage weighted mean modulation transfer function (MTF) is greater than 0.5.
This system adopts coaxial spherical optics system design, and aperture diaphragm 6 is positioned on the secondary mirror 2, in order to remove the influence of blocking, adopts the anorthopia field to use, and promptly uses the outer visual field of axle as working field of view, i.e. the anorthopia field.
The curved surface at three mirror optics face places of this system has a common optical axis 7, the optical axis of secondary mirror 2 overlaps with common optical axis 7, the clear aperature of primary mirror 1 and the 3rd mirror 4 is left optical axis respectively and is positioned at the both sides of optical axis 7, and the working field of view of described anastigmatic system is from axle; Incide primary mirror 1 with the parallel beam 8 of optical axis deviation a angle, reflex to secondary mirror 2, after 4 reflections of the 3rd mirror, looking like plane 5 imagings through primary mirror 1.
Focal distance f '=500mm; Field angle is 10 ° * 1 °; Relative aperture is 1/12;
Overall dimensions: (482 * 440 * 260) mm
3Spectrum segment: (0.5-0.78) micron;
The anorthopia field: directions X is (3 ° to 3 °); The Y direction is (4.2 ° to 5.0 °).
The structural parameters of primary mirror 1: radius-of-curvature is-1519.828mm (concave surface); The spacing d1 of primary mirror 1 and secondary mirror 2 is-440.791mm; Y from the axle amount is-101.35mm; Tilt quantity is 0; Coefficient of excentralization is 0; Clear aperature is (67.7 * 31.9) mm
2
The structural parameters of secondary mirror 2: radius-of-curvature is-472.85mm (convex surface); Coefficient of excentralization is 2.1866; The spacing d2 of secondary mirror 2 and folding mirror 3 is 450mm; Y is 0mm from the axle amount; Tilt quantity is 0; The clear aperature diameter is 9mm; When providing certain tilt quantity, the 3rd mirror can with primary mirror at the optical axis homonymy.
The structural parameters of folding plane mirror 3: radius-of-curvature is infinitely great; Folding plane mirror 3 and the 3rd mirror 4 spacing d3 are-425mm; Y is 104.32mm from the axle amount; Tilt quantity is 0; Coefficient of excentralization is 0; Clear aperature is (62.0 * 25.2) mm
2
The structural parameters of the 3rd mirror 4: radius-of-curvature is 715.117mm (concave surface); The spacing d4 of the 3rd mirror 4 and image planes 5 is 455.027mm; Y is 193.65mm from the axle amount; Tilt quantity is 0; Coefficient of excentralization is 0; Clear aperature is (105.5 * 35.0) mm
2
The image quality of system is: when characteristic frequency be 50 lines right/when millimeter, full visual field full spectral coverage weighted mean modulation transfer function (MTF) is greater than 0.5.
The curved surface at three mirror optics face places of native system has a common optical axis 7, the optical axis of secondary mirror 2 overlaps with common optical axis 7, aperture diaphragm 6 is positioned on the secondary mirror 2, the clear aperature of primary mirror 1 and the 3rd mirror 4 is left optical axis respectively and is positioned at the both sides of optical axis 7, and the working field of view of described anastigmatic system is from axle; Incide primary mirror 1 with the parallel beam 8 of optical axis deviation a angle, reflex to secondary mirror 2, reflex to folding mirror 3 through secondary mirror 2 through primary mirror 1, again through the 3rd mirror 4 reflection back looking like plane 5 imagings, detector can be installed on imaging surface come imaging.
Optical system of the present invention is when the focal length convergent-divergent, and other structural parameters are during according to same zoom factor convergent-divergent, and it is good that picture element still keeps.
Claims (2)
1. a catoptron anastigmatic system comprises primary mirror (1), secondary mirror (2) and (4) three catoptrons of the 3rd mirror, it is characterized in that:
A. primary mirror and the 3rd mirror are spherical mirror in described three catoptrons, and the reflecting curved surface of secondary mirror is the secondary oblate spheroid, and the curved surface at three mirror optics face places has a common optical axis (7);
B. this system also comprises an aperture diaphragm (6), and described aperture diaphragm (6) is positioned on the described secondary mirror (2) or near the front and back light path the secondary mirror (2);
C. the optical axis of secondary mirror (2) overlaps with common optical axis (7), and the clear aperature of described primary mirror (1) and the 3rd mirror (4) lays respectively at the both sides of common optical axis (7);
D. the working field of view of described anastigmatic system is from axle; Incide primary mirror (1) with the parallel beam (8) of optical axis deviation a angle, after primary mirror (1), secondary mirror (2) and the 3rd mirror (4) reflection, looking like plane (5) imaging successively.
2. a catoptron anastigmatic system comprises primary mirror (1), secondary mirror (2) and (4) three catoptrons of the 3rd mirror, it is characterized in that:
A. primary mirror and the 3rd mirror are spherical mirror in described three catoptrons, and the reflecting curved surface of secondary mirror is the secondary oblate spheroid, and the curved surface at three mirror optics face places has a common optical axis (7);
B. this system also comprises an aperture diaphragm (6) and a folding plane mirror (3) that is used for folding secondary mirror (2) emitting light path, this catoptron can not tilt to place, also can place by certain pitch angle, described aperture diaphragm (6) is positioned on the described secondary mirror (2) or near the front and back light path the secondary mirror (2);
C. the optical axis of secondary mirror (2) overlaps with common optical axis (7), and the clear aperature of described primary mirror (1) and the 3rd mirror (4) lays respectively at the one or both sides of common optical axis (7);
D. the working field of view of described anastigmatic system is from axle; Incide primary mirror (1) with the parallel beam (8) of optical axis deviation a angle, after primary mirror (1), secondary mirror (2), folding plane mirror (3) and the 3rd mirror (4) reflection, looking like plane (5) imaging successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031047661A CN1173203C (en) | 2003-02-28 | 2003-02-28 | Astigmatism eliminating three reflector system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031047661A CN1173203C (en) | 2003-02-28 | 2003-02-28 | Astigmatism eliminating three reflector system |
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| CN1432836A true CN1432836A (en) | 2003-07-30 |
| CN1173203C CN1173203C (en) | 2004-10-27 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432749C (en) * | 2007-07-25 | 2008-11-12 | 中国科学院上海技术物理研究所 | Optical axis conversion method in assembly and debugging of off-axis three-reflection optical system |
| CN102062936A (en) * | 2010-12-24 | 2011-05-18 | 中国科学院长春光学精密机械与物理研究所 | Off-axis TMA optical system for reducing processing and resetting difficulty |
| CN101697031B (en) * | 2009-10-21 | 2011-06-01 | 北京理工大学 | Wideband, high-resolution and varifocal three-mirror reflective optical system |
| CN102736237A (en) * | 2012-06-18 | 2012-10-17 | 北京空间机电研究所 | Optical system for space astronomical observation infra-red telescope |
| CN107677264A (en) * | 2017-08-15 | 2018-02-09 | 北京控制工程研究所 | A kind of reflective star sensor |
| CN109212734A (en) * | 2018-10-25 | 2019-01-15 | 苏州科技大学 | A kind of anti-optical imaging system of sparse aperture two based on free form surface |
| CN111487755A (en) * | 2019-01-25 | 2020-08-04 | 清华大学 | Free-form surface off-axis three-mirror imaging system |
-
2003
- 2003-02-28 CN CNB031047661A patent/CN1173203C/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432749C (en) * | 2007-07-25 | 2008-11-12 | 中国科学院上海技术物理研究所 | Optical axis conversion method in assembly and debugging of off-axis three-reflection optical system |
| CN101697031B (en) * | 2009-10-21 | 2011-06-01 | 北京理工大学 | Wideband, high-resolution and varifocal three-mirror reflective optical system |
| CN102062936A (en) * | 2010-12-24 | 2011-05-18 | 中国科学院长春光学精密机械与物理研究所 | Off-axis TMA optical system for reducing processing and resetting difficulty |
| CN102062936B (en) * | 2010-12-24 | 2012-07-25 | 中国科学院长春光学精密机械与物理研究所 | Off-axis TMA optical system for reducing processing and resetting difficulty |
| CN102736237A (en) * | 2012-06-18 | 2012-10-17 | 北京空间机电研究所 | Optical system for space astronomical observation infra-red telescope |
| CN102736237B (en) * | 2012-06-18 | 2014-10-08 | 北京空间机电研究所 | Optical system for space astronomical observation infra-red telescope |
| CN107677264A (en) * | 2017-08-15 | 2018-02-09 | 北京控制工程研究所 | A kind of reflective star sensor |
| CN107677264B (en) * | 2017-08-15 | 2020-09-18 | 北京控制工程研究所 | Reflective star sensor |
| CN109212734A (en) * | 2018-10-25 | 2019-01-15 | 苏州科技大学 | A kind of anti-optical imaging system of sparse aperture two based on free form surface |
| CN109212734B (en) * | 2018-10-25 | 2023-09-12 | 苏州科技大学 | Free-form surface-based sparse aperture two-reflection optical imaging system |
| CN111487755A (en) * | 2019-01-25 | 2020-08-04 | 清华大学 | Free-form surface off-axis three-mirror imaging system |
| CN111487755B (en) * | 2019-01-25 | 2021-06-25 | 清华大学 | Free-form surface off-axis three-mirror imaging system |
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| Publication number | Publication date |
|---|---|
| CN1173203C (en) | 2004-10-27 |
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