CN103268008A - Long-focus and high-resolution optical system - Google Patents
Long-focus and high-resolution optical system Download PDFInfo
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- CN103268008A CN103268008A CN2013101822916A CN201310182291A CN103268008A CN 103268008 A CN103268008 A CN 103268008A CN 2013101822916 A CN2013101822916 A CN 2013101822916A CN 201310182291 A CN201310182291 A CN 201310182291A CN 103268008 A CN103268008 A CN 103268008A
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- catoptron
- mirror
- optical system
- refraction mirror
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Abstract
The invention relates to a long-focus and high-resolution optical system which comprises a first reflector, a second reflector, a first negative refraction mirror, a third reflector, a first positive refraction mirror, a second positive refraction mirror, a second negative refraction mirror, a third negative refraction mirror, a fourth reflector, a fourth negative refraction mirror and an image surface which are arranged on the same optical path in sequence. The long-focus and high-resolution optical system has the advantages that the application range is wide, long focus and high resolution can be achieved, the structure of the whole system is compact, machining and detection are easy, and imaging quality approximates to diffraction limit.
Description
Technical field
Field of photoelectric technology of the present invention is specifically related to a kind of long-focus optical system for high resolution, relates in particular to a kind of long-focus optical system for high resolution that is used for space flight noncooperative target detection system of suitable space environment.
Background technology
The spatial resolution of Space Optical System is relevant with the optical system relative aperture, when the optical system bore is got go-no-go, increases focal length and can improve systemic resolution, and the field angle of increase system can enlarge the cover width to ground.By above analysis and requirement, long-focus is favourable for the performance that improves Space Optical System.For the long-focus optical system for high resolution, when adopting transmittance structure, it is very big to make that the bore of lens is done, because bigbore transmission material is not easy preparation, so the transmission-type structure has been applied to restriction in the long-focus optical system for high resolution; Though the total reflection structure can be with the long-focus of optical system, and these advantages of no color differnece, such as non co axial three mirrors of being formed by the three catoptrons astigmatism reflecting system structure that disappears, structural system has several variablees, comprise 3 radiuses, 3 intervals, 15 asphericity coefficients ought not use the quadric surface coefficient, when the high order aspheric surface coefficient is only used 12 times, can satisfy a plurality of dimension constraint requirements such as long-focus, primary aberration, central obscuration, work distance by each parameter of suitable control, it is very high that but the total reflection structure is debug precision, and it is bigger to implement difficulty in the practical engineering application.The catadioptric structure composition characteristics of transmittance structure and two kinds of structures of total reflection structure, has good engineering using value, catadioptric structure commonly used is Cassegrain's structure, system is linear structure, for long-focal distance optical system, its length overall undoubtedly can be very big, and this runs counter to the miniaturization principle of design of Space Optical System.
Summary of the invention
The technical matters that solves
For fear of the deficiencies in the prior art part, the present invention proposes a kind of long-focus optical system for high resolution, it is the good remodeling Cassegrain catadioptric structure of a kind of compact conformation image quality, be applicable to the space long-focal distance optical system, detection difficult is processed in the existing long-focus optical system for high resolution preparation of solution, machine system is long, the problem that resetting difficulty is big.
Technical scheme
A kind of long-focus optical system for high resolution is characterized in that comprising first catoptron 1, second catoptron 2, the 3rd catoptron 4, the 4th catoptron 9, the first negative refraction mirror 3, the first positive refraction mirror 5, the second positive refraction mirror 6, the second negative refraction mirror 7, the 3rd negative refraction mirror 8 and the 4th negative refraction mirror 10; Be provided with first catoptron 1 in input path, optical axis at first catoptron 1 is provided with second catoptron 2, optical axis at second catoptron 2 is provided with the 3rd catoptron 4, on the optical axis of the 3rd catoptron 4, be provided with the first positive refraction mirror 5, the second positive refraction mirror 6, the second negative refraction mirror 7, the 3rd negative refraction mirror 8 and the 4th catoptron 9 successively, on the optical axis of the 4th catoptron 9, be provided with the 4th negative refraction mirror 10 and image planes 11 successively; Described first catoptron 1 and second catoptron 2 are for having the catoptron of curvature; Described the 3rd catoptron 4 and the 4th catoptron 9 are plane mirror.
Described first catoptron 1 is paraboloidal catoptron.
Described second catoptron 2 is quadric catoptron.
Described the 3rd catoptron 4 and the 4th catoptron 9 all with optical axis angle at 45.
The described first negative refraction mirror 3, the first positive refraction mirror 5, the second positive refraction mirror 6, the second negative refraction mirror 7, the 3rd negative refraction mirror 8 and the 4th negative refraction mirror 10 are spherical mirror.
Described the 3rd catoptron 4 is the folding axial plane mirror of one 45 ° of inclinations.
Described the 4th catoptron 9 is the folding axial plane mirror of one 45 ° of inclinations.
Beneficial effect
A kind of long-focus optical system for high resolution that the present invention proposes, primary mirror and secondary mirror are quadric surface, and wherein primary mirror is parabolic, and secondary mirror is hyperboloid, by six refracting telescope balance off-axis aberration, effectively shortened the size of machine system by two folding axle mirrors.The invention provides a kind of applied widely, can realize that long-focus high resolving power, machine system light in structure are little, be easy to process detection, image quality is near the optical system of diffraction limit.
Advantage of the present invention is:
1, focal length is very long, and higher resolution is arranged, and the present invention is by rational deployment, and the focal power of each optical element of reasonable distribution has strengthened the focal length of system.
2, the imaging spectral wide ranges of the optical system among the present invention is 500～800nm, can obtain wideer spectral characteristic.
3, the primary mirror of the optical system among the present invention and secondary mirror are quadric surface, are easy to detect.
4, the folding of two among the present invention axle mirror has effectively reduced the bulk of machine system, is conducive to the miniaturization design.
5, the refracting telescope of the optical system among the present invention is sphere, is easy to processing and detects.
6, the refracting telescope refracting telescope material of the optical system among the present invention is ZF2 and K9, is homemade glass, and cost is low.
7, the image quality of the long-focus optical system for high resolution among the present invention is good, and image quality reaches diffraction limit.
Description of drawings
Fig. 1 is optical system structure synoptic diagram provided by the present invention;
1-first catoptron, 2-second catoptron, the 3-first negative refraction mirror, 4-the 3rd catoptron, 5 first positive refraction mirrors-, the 6-second positive refraction mirror, the 7-second negative refraction mirror, 8-the 3rd negative refraction mirror, 9-the 4th catoptron, 10 the 4th negative refraction mirrors-, the 11-image planes,
Fig. 2 is modulation transfer function of optical system provided by the present invention (MTF) synoptic diagram.
Embodiment
Now in conjunction with the embodiments, accompanying drawing is further described the present invention:
Referring to Fig. 1, the invention provides a kind of long-focus optical system for high resolution, this optical system comprises first catoptron (1), second catoptron (2), the first negative refraction mirror (3), the 3rd catoptron (4), the first positive refraction mirror (5), the second positive refraction mirror (6), the second negative refraction mirror (7), the 3rd negative refraction mirror (8), the 4th catoptron (9), the 4th negative refraction mirror (10), image planes (11), is successively set on the same light path.
In order to reduce the catoptron detection difficulty in this optical system, primary mirror and secondary mirror all adopt quadric surface face type among the present invention, and wherein primary mirror is parabolic, and secondary mirror is hyperboloid.
For processing cost and the difficulty that reduces the refracting telescope in this optical system, refracting telescope all adopts sphere face type among the present invention.
In order to reduce the machine system size of this optical system, two folding axial plane mirrors have been introduced among the present invention.
The embodiment of the invention is applied in the long-focus optical system for high resolution in the space environment space flight noncooperative target detection system, with reference to following parameter the first negative refraction mirror, the second positive refraction mirror and the 4th negative refraction mirror are configured, it is effective can be better.
For the first negative refraction mirror:
-2.2f
1＜f
1＜-1.3f
1 1.7＜n
1＜1.8
-0.0005f
1＜R
1＜-0.0001f
1 R
2＜-0.00015f
1
For the second positive refraction mirror:
0.2f
2＜f
2＜0.48f
2 1.7＜n
2＜1.8
-0.52f
2＜R
3＜-0.16f
2 -0.11f
2＜R
4＜-0.03f
2
For the 4th negative refraction mirror:
-0.025f
3＜f
3＜-0.016f
3 1.6＜n
3＜1.7
-0.00063f
3＜R
5＜-0.00054f
3 -0.00051f
3＜R
6＜-0.00035f
3
In the parameters relationship of above-mentioned each lens, f wherein
1, f
2, f
3Be the focal length of the first negative refraction mirror, the second positive refraction mirror and the 4th negative refraction mirror, R
1, R
2, R
3, R
4, R
5, R
6Be the radius-of-curvature of six faces of the first negative refraction mirror, the second positive refraction mirror and the 4th negative refraction mirror, n
1, n
2, n
3It is the refractive index of the first negative refraction mirror, the second positive refraction mirror and the 4th negative refraction mirror.
Adopt the modulation transfer function (MTF) evaluation means to test and assess to a kind of long-focus optical system for high resolution in the present embodiment.Table 1 has provided the biography letter of each visual field meridian direction of spatial frequency 50lp/mm place and the concrete biography letter value of sagitta of arc direction, and the numerical value of both direction is all near diffraction limit as can be known, and system imaging is good.
The modulation transfer function numerical value of each visual field of table 150lp/mm
| The visual field | Meridian passes letter | The sagitta of arc passes letter |
| 0 | 0.471 | 0.471 |
| 0.2ω | 0.471 | 0.469 |
| 0.5ω | 0.469 | 0.466 |
| 0.7ω | 0.468 | 0.463 |
| ω | 0.467 | 0.453 |
Referring to Fig. 1, long-focus optical system for high resolution in the space flight noncooperative target detection system, it uses wavelength coverage is 500～800nm, be 915mm according to the distance along optical axis between the 0 visual field chief ray trace two folding axle mirrors, back work distance is 81.76mm, optical system does not have vignetting, when reality is used, need add a window in secondary mirror the place ahead.
The aberration correction of optical system provided by the invention is very good, image quality is very high, reached the purpose of design, this long-focus optical system for high resolution, by material and the parameter of changing six refracting telescopes, also be suitable in the system of different spectral coverages, can in rugged environment, use simultaneously.
Claims (7)
1. a long-focus optical system for high resolution is characterized in that comprising first catoptron (1), second catoptron (2), the 3rd catoptron (4), the 4th catoptron (9), the first negative refraction mirror (3), the first positive refraction mirror (5), the second positive refraction mirror (6), the second negative refraction mirror (7), the 3rd negative refraction mirror (8) and the 4th negative refraction mirror (10); Be provided with first catoptron (1) in input path, optical axis at first catoptron (1) is provided with second catoptron (2), optical axis at second catoptron (2) is provided with the 3rd catoptron (4), on the optical axis of the 3rd catoptron (4), be provided with the first positive refraction mirror (5), the second positive refraction mirror (6), the second negative refraction mirror (7), the 3rd negative refraction mirror (8) and the 4th catoptron (9) successively, on the optical axis of the 4th catoptron (9), be provided with the 4th negative refraction mirror (10) and image planes (11) successively; Described first catoptron (1) and second catoptron (2) are for having the catoptron of curvature; Described the 3rd catoptron (4) and the 4th catoptron (9) are plane mirror.
2. according to the described long-focus optical system for high resolution of claim 1, it is characterized in that: described first catoptron (1) is paraboloidal catoptron.
3. according to the described long-focus optical system for high resolution of claim 1, it is characterized in that: described second catoptron (2) is quadric catoptron.
4. according to the described long-focus optical system for high resolution of claim 1, it is characterized in that: described the 3rd catoptron (4) and the 4th catoptron (9) all with optical axis angle at 45.
5. according to the described long-focus optical system for high resolution of claim 1, it is characterized in that: the described first negative refraction mirror (3), the first positive refraction mirror (5), the second positive refraction mirror (6), the second negative refraction mirror (7), the 3rd negative refraction mirror (8) and the 4th negative refraction mirror (10) are spherical mirror.
6. according to the described long-focus optical system for high resolution of claim 1, it is characterized in that: described the 3rd catoptron (4) is the folding axial plane mirror of one 45 ° of inclinations.
7. according to the described long-focus optical system for high resolution of claim 1, it is characterized in that: described the 4th catoptron (9) is the folding axial plane mirror of one 45 ° of inclinations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310182291.6A CN103268008B (en) | 2013-05-16 | 2013-05-16 | Long-focus and high-resolution optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310182291.6A CN103268008B (en) | 2013-05-16 | 2013-05-16 | Long-focus and high-resolution optical system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103268008A true CN103268008A (en) | 2013-08-28 |
| CN103268008B CN103268008B (en) | 2015-05-13 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201173990Y (en) * | 2008-03-31 | 2008-12-31 | 首都师范大学 | Catadioptric astronomical having focal reducer |
| CN101849205A (en) * | 2007-09-05 | 2010-09-29 | 卡尔蔡司Smt股份公司 | Chromatically corrected catadioptric objective and projection exposure apparatus including the same |
| US20110141594A1 (en) * | 2006-04-25 | 2011-06-16 | Rudolph Technologies, Inc. | Reflective objective |
| US20120002202A1 (en) * | 2010-07-02 | 2012-01-05 | Chrisp Michael P | Dual waveband compact catadioptric imaging spectrometer |
| CN102364372A (en) * | 2011-11-04 | 2012-02-29 | 四川九洲电器集团有限责任公司 | Multispectral refraction-reflection type optical system |
-
2013
- 2013-05-16 CN CN201310182291.6A patent/CN103268008B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110141594A1 (en) * | 2006-04-25 | 2011-06-16 | Rudolph Technologies, Inc. | Reflective objective |
| CN101849205A (en) * | 2007-09-05 | 2010-09-29 | 卡尔蔡司Smt股份公司 | Chromatically corrected catadioptric objective and projection exposure apparatus including the same |
| CN201173990Y (en) * | 2008-03-31 | 2008-12-31 | 首都师范大学 | Catadioptric astronomical having focal reducer |
| US20120002202A1 (en) * | 2010-07-02 | 2012-01-05 | Chrisp Michael P | Dual waveband compact catadioptric imaging spectrometer |
| CN102364372A (en) * | 2011-11-04 | 2012-02-29 | 四川九洲电器集团有限责任公司 | Multispectral refraction-reflection type optical system |
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| CN103268008B (en) | 2015-05-13 |
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