CN1140828C - Astigmatism-eliminating three-reflector optical system - Google Patents
Astigmatism-eliminating three-reflector optical system Download PDFInfo
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- CN1140828C CN1140828C CNB011321296A CN01132129A CN1140828C CN 1140828 C CN1140828 C CN 1140828C CN B011321296 A CNB011321296 A CN B011321296A CN 01132129 A CN01132129 A CN 01132129A CN 1140828 C CN1140828 C CN 1140828C
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- optical axis
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- reflector
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Abstract
The present invention discloses an astigmatism-eliminating three-reflector optical system which comprises a main reflector, a second reflector and a third reflector, wherein the second reflector is a spherical reflector of which the optical axis is the optical axis of the optical system. The optical axes of the main reflector and the third reflector are in the same plane of the optical axis of the system and deviate from the optical axis of the system to have no angular inclination with the optical axis of the system. The reflecting surfaces of the main reflector and the third reflector are secondary ellipsoidal surfaces. The system is mainly used as the optical system of a space telescope or can be used in the field of optical communication. The curved surfaces of the reflectors of the system are spherical surfaces and secondary ellipsoidal surfaces in simple shapes, the position of the reflectors only offsets a certain distance in a translation mode without any inclination relatively to the optical axis of the optical system, and therefore, compared with a common abaxial astigmatism-eliminating three-reflector optical system, the system is easy to process, install and correct.
Description
Technical field
The present invention relates to optical system, specifically is a kind of astigmatism-eliminating three-reflector optical system, and it is mainly used in the space to ground observation telescope, and application is also arranged in optical communication field.
Background technology
In the autocollimator system, because two mirror system optical design free variables have only four, contradiction between aberration correction and the system's overall size has limited design to a great extent, if system is increasing a catoptron, then the free variable of system design can increase to seven, thereby increased the anaberrational possibility of system greatly, this also is that big visual field, big relative aperture space telescope system adopt three mirror optics structural reason mostly.
In U.S. Pat 4,131, in 485, Korsch has provided the space telescope optical system structure of a coaxial astigmatism-eliminating three-reflector formula, the reflecting surface of the principal reflection mirror of this system and the 3rd catoptron is an ellipsoid, the reflecting surface of second catoptron is a hyperboloid, has laid 45 ° of catoptrons and make the system light path structure more help laying of detector or camera near first, second catoptron imaging surface.This coaxial three-mirror system also has the description of concrete similar optical system structure in German patent DE 4229874A1 and DE 4226723A1.
There is the shortcoming of central obscuration in coaxial three-reflector optical system, and people work out from axle three anti-mirror optical textures in the process that addresses this problem.U.S. Pat 4,265,510 have provided the concrete structure from the axle three-reflector optical system, the principal reflection mirror optical axis of system is a systematic optical axis, the reflecting surface of principal reflection mirror is an ellipsoid, and second catoptron is from the axle hyperboloid, it depart from systematic optical axis and with a certain angle of inclined light shaft, the 3rd catoptron is from the axle ellipsoid, departs from optical axis and the angle certain with inclined light shaft equally.
From axle three anti-mirror systems is that perfectly its system design performance can reach optical diffraction limit in optical design.But because the catoptron of system is secondary or high order aspheric surface from axle, its difficulty of processing is big, the manufacturing cost height, and the optical axis and the certain angle that tilts will be departed from the position of catoptron, and this brings unprecedented difficulty to system dress school again.
Summary of the invention
Design proposal of the present invention is: reduce the difficulty and the expense of optics processing by adopting simple as far as possible catoptron curved surface, reduce the difficulty in system optics dress school by the method that adopts reflector position only not tilt, thereby make three anti-mirror systems be easier to processing, make from axle.
Astigmatism-eliminating three-reflector of the present invention system comprises principal reflection mirror 1, second catoptron 5, the 3rd catoptron 2 and diaphragm 4 as shown in Figure 1.Second catoptron, 5 optical axises are the optical axis of optical system, principal reflection mirror 1 optical axis and the 3rd catoptron 2 optical axises and systematic optical axis are in same plane, and depart to upper and lower two limits of systematic optical axis respectively, principal reflection mirror 1 departs from systematic optical axis distance D 1, the three catoptron 2 and departs from systematic optical axis distance D 2.Axially spaced-apart distance L 1 between the principal reflection mirror 1 and second catoptron 5, axially spaced-apart distance L 2 between the 3rd catoptron 2 and second catoptron 5, the diaphragm 4 of optical system is positioned on second catoptron 5, but can do certain adjustment as required, as be placed in the front end of principal reflection mirror 1, be placed on the principal reflection mirror 1, be placed between the principal reflection mirror 1 and second catoptron 4 or be placed between second catoptron 4 and the 3rd catoptron 2.The reflecting curved surface of principal reflection mirror 1 and the 3rd catoptron 2 is from axle secondary ellipsoid, and second catoptron 5 is common spherical reflector.
The optical system imaging principle is: send the parallel beam 6 that departs from certain angle α with systematic optical axis to converge in from the 3rd catoptron 2 axial spacings after principal reflection mirror 1, second catoptron 5 and 2 reflections of the 3rd catoptron be on the picture plane 3 of L3 from distant place object, depart from the systematic optical axis distance as planar central and be D3, on picture 3 positions, plane, settle image sensor spare, as film, CCD device, cmos device etc., just can obtain the information of distant place object.
The invention has the advantages that:
1. second catoptron 5 of optical system is common spherical reflector, and the optical axis of second catoptron is exactly the optical axis of system, so the optical axis of this three-reflector optical system is easy to determine that this brings great convenience to system optics dress school;
2. second catoptron 5 is common spherical reflector, and the reflecting surface of principal reflection mirror 1 and the 3rd catoptron 2 also only is the secondary ellipsoid from axle, this compares with the three-mirror system of routine, and the difficulty of processing of its catoptron greatly reduces, and processing charges also decreases;
3. principal reflection mirror 1 and the 3rd catoptron 2 only depart from certain distance with systematic optical axis, do not have the requirement at any angle of inclination with systematic optical axis, and this has alleviated the difficulty of system when optics is adjusted greatly.
Description of drawings
Fig. 1 is from axle astigmatism-eliminating three-reflector optical system structural drawing, and 1 is the optical system principal reflection mirror; 2 is optical system the 3rd catoptron; 3 is that optical system is as the plane; 4 is the optical system diaphragm; 5 is optical system second catoptron; 6 is the parallel beam from distant place object.
Fig. 2 is the optical transfer function curve map of embodiment 1 optical system.
Fig. 3 is the optical transfer function curve map of embodiment 2 optical systems.
Embodiment
Embodiment 1:
We have designed a spaceborne telescopical optical system structure according to optical system structure shown in Figure 1, and spaceborne telescopical the key technical indexes is:
Satellite orbital altitude: 686Km
Ground resolution: 4m
Spectral range: panchromatic
Swath width: 24Km
Detector: 6000 yuan of CCD linear array (unit sizes: 7 μ m * 7 μ m)
The technical indicator of the optical system of being formulated by telescopical general technical index is:
Focal length: 1200mm
Bore: φ 300mm
Wavelength: 0.5-0.8 μ m
Visual field: 2 ° (linear field)
Concrete optical texture parameter designing result is attached, and the optical system transfer curve is seen Fig. 2.
Embodiment 2:
We have designed a spaceborne telescopical optical system structure according to optical system structure shown in Figure 1, and spaceborne telescopical the key technical indexes is:
Satellite orbital altitude: 600Km
Ground resolution: 4.5m
Spectral range: panchromatic
Swath width: 27Km
Detector: 6000 yuan of CCD linear array (unit sizes: 10 μ m * 10 μ m)
The technical indicator of the optical system of being formulated by telescopical general technical index is:
Focal length: 1333.33mm
Bore: φ 300mm
Wavelength: 0.5-0.8 μ m
Visual field: 2.83 ° (linear field)
Concrete optical texture parameter designing result is attached, and optical system optical transfer function curve is seen Fig. 3.Optical texture parameter designing result:
Claims (1)
1. an astigmatism-eliminating three-reflector optical system comprises principal reflection mirror (1), second catoptron (5), the 3rd catoptron (2) and diaphragm (4); It is characterized in that:
A. second catoptron (5) optical axis is the optical axis of optical system, and principal reflection mirror (1) optical axis and the 3rd catoptron (2) optical axis and systematic optical axis and depart to upper and lower two limits of systematic optical axis respectively in same plane;
B. the reflecting curved surface of principal reflection mirror (1) and the 3rd catoptron (2) is from axle secondary ellipsoid, and second catoptron (5) is common spherical reflector;
C. the optical axis non-angular of the optical axis of principal reflection mirror (1), second catoptron (5) and the 3rd catoptron (2) and optical system tilts;
D. send with systematic optical axis from distant place object and depart from the parallel beam (6) of certain angle α on converging in as plane (3) after principal reflection mirror (1), second catoptron (5) and the 3rd catoptron (2) reflection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011321296A CN1140828C (en) | 2001-11-07 | 2001-11-07 | Astigmatism-eliminating three-reflector optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011321296A CN1140828C (en) | 2001-11-07 | 2001-11-07 | Astigmatism-eliminating three-reflector optical system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1350190A CN1350190A (en) | 2002-05-22 |
| CN1140828C true CN1140828C (en) | 2004-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB011321296A Expired - Fee Related CN1140828C (en) | 2001-11-07 | 2001-11-07 | Astigmatism-eliminating three-reflector optical system |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100580499C (en) * | 2007-11-21 | 2010-01-13 | 中国科学院上海技术物理研究所 | Refraction-reflection type dual-waveband imaging telescope optical system |
| CN101303449B (en) * | 2008-07-10 | 2010-06-02 | 北京空间机电研究所 | Double-visual field off-axis three-mirror integrated type optical system for sharing primary and secondary lens |
| CN101576591B (en) * | 2009-06-09 | 2011-11-23 | 北京邮电大学 | System and method for measuring compact range antenna by three reflectors |
| CN101770158B (en) * | 2009-12-30 | 2011-03-30 | 北京空间机电研究所 | Double-field-of-view stereoimaging optical system based on integrated shared primary mirror |
| 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 |
| 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 |
| CN102590993A (en) * | 2012-03-23 | 2012-07-18 | 中国科学院长春光学精密机械与物理研究所 | Rectangular large-field distortion-eliminated off-axis three-mirror anastigmat (TMA) optical system |
| CN103809277B (en) * | 2012-11-06 | 2016-09-14 | 清华大学 | Off-axis three anti-mirrors |
| CN104865686A (en) * | 2015-05-22 | 2015-08-26 | 哈尔滨工业大学 | Off-axis three-mirror optical system based on main three-mirror integrated wide spectrum |
| CN105242387B (en) * | 2015-10-26 | 2018-04-10 | 中国科学院西安光学精密机械研究所 | A kind of off-axis three anti-system of big visual field and Method of Adjustment |
| CN105785392A (en) * | 2016-04-15 | 2016-07-20 | 中国科学院上海技术物理研究所 | Four-beam laser three-dimensional imaging optical system based on coaxial three-mirror-anastigmat afocal telescope |
| CN107677264B (en) * | 2017-08-15 | 2020-09-18 | 北京控制工程研究所 | Reflective star sensor |
| CN107505694B (en) * | 2017-09-22 | 2020-07-24 | 天津大学 | Method for improving imaging quality of off-axis three-mirror optical system |
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2001
- 2001-11-07 CN CNB011321296A patent/CN1140828C/en not_active Expired - Fee Related
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| CN1350190A (en) | 2002-05-22 |
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