CN1257422C - Binocular refracting-reflecting optical system for satellite multi-spectral imaging instrument - Google Patents
Binocular refracting-reflecting optical system for satellite multi-spectral imaging instrument Download PDFInfo
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- CN1257422C CN1257422C CN 200410066548 CN200410066548A CN1257422C CN 1257422 C CN1257422 C CN 1257422C CN 200410066548 CN200410066548 CN 200410066548 CN 200410066548 A CN200410066548 A CN 200410066548A CN 1257422 C CN1257422 C CN 1257422C
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- 230000003287 optical effect Effects 0.000 title claims abstract description 58
- 238000000701 chemical imaging Methods 0.000 title 1
- 238000004611 spectroscopical analysis Methods 0.000 claims abstract description 29
- 238000003384 imaging method Methods 0.000 claims abstract description 17
- 230000004075 alteration Effects 0.000 claims description 30
- 238000000926 separation method Methods 0.000 claims description 16
- 230000011514 reflex Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 abstract description 2
- 230000000007 visual effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 2
- 229910052732 germanium Inorganic materials 0.000 description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
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- 230000001915 proofreading effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
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Abstract
The present invention discloses a binocular refraction and reflection type optical system used for spaceborne multi-spectrum imaging instrument, which is characterized in that the optical system is provided with a scanning reflection mirror and two spectroscopy systems from an object to an image in sequence. Each of the two spectroscopy systems is respectively composed of a main reflection mirror, a secondary reflection mirror and an image difference correcting lens set. The present invention has the advantages that the system structure is simple and compact; the processing and the loading and correcting technology is mature. Because a double optical systems are adopted, the difficulties of an optical system design, processing and loading and correcting are wholly reduced, and optical efficiency and image quality are improved.
Description
Technical field
The present invention relates to optical element, system, specifically be meant a kind of broadband large visual field optical system that is used for spaceborne multi-spectral imager.This optical system can be implemented under 2.3 ° of visual fields, divides the spectral coverage imaging to 11 wave bands in 0.45 μ m～12.0 mum wavelength scopes.
Background technology
The transmission optics system is because refractor can be introduced aberration, therefore be difficult to realize broadband imaging, can only realize narrower wave band imaging at present, as: the Super Lamegon PI5.6/90B camera lens of the RC-10 type aerotar of Switzerland Witter factory, German Zeiss (draws from " optical technology handbook volume two ", king Zhijiang River chief editor, the 976th～985 page, China Machine Press published in 1994), its imaging bandwidth is all at 0.4～0.9 mu m waveband.Catadioptric optical system can be realized the imaging in the broadband scope, as 10 wave bands on the FY-1C weather satellite of China visible-infrared scanning radiometer, its wavelength band covers from 0.43 μ m to 12.5 μ m, but the visual field has only 0.072 °, can only realize cell imaging (infrared and millimeter wave journal, the 19th volume, the 5th phase, the 321st～326 page).The total-reflection type optical system can realize the big view field imaging of broadband, as U.S. Pat 4,265,510 " from axle astigmatism-eliminating three-reflector telescopic systems ", but because this total-reflection type optical system structure more complicated, therefore processing and system dress school is difficult.
Summary of the invention
The objective of the invention is to propose a kind of under 2.3 ° of visual fields, in 0.45 μ m～12.0 mum wavelength scopes, that is, visible light divides the binocular refracting-reflecting optical system of spectral coverage imaging to 11 wave bands of long wave infrared region.
Binocular refracting-reflecting optical system of the present invention enters two spectroscopy systems from earth echo signal respectively through scanning reflection mirror 15 reflections: the dual-waveband imaging of first spectroscopy system realization medium wave and LONG WAVE INFRARED as shown in Figure 1; The second spectroscopy system realizes the light spectrum image-forming of 9 wave bands in 0.45 μ m～2.5 mum wavelength scopes.The field of view (fov) registration of two optical systems can be realized by the mechanical adjustment and the image process method of routine.
The first spectroscopy system is made up of a secondary mirror 1, principal reflection mirror 2, aberration correction lens combination 3 and optical filter 4 to picture side in order from object space.
The second spectroscopy system from object space to picture side in order by a secondary mirror 6, principal reflection mirror 7, one this optical system is divided into two tunnel color separation film 8, a tunnel forms by aberration correction lens combination 12 and optical filter 13 successively by aberration correction lens combination 9 and optical filter 10, another road successively.
Earth echo signal enters the first spectroscopy system and the second spectroscopy system respectively through scanning reflection mirror 15 reflections.
The first spectroscopy system: the earth echo signal directive principal reflection mirror 2 of scanning reflection mirror 15 reflections of hanging oneself, reflex to secondary mirror 1 through it, reflect to picture side by secondary mirror 1 again, successively by behind first refractor 301 in the aberration correction lens combination 3, second refractor 302, through optical filter 4 imaging on picture planar detector 5.
The second spectroscopy system: the earth echo signal directive principal reflection mirror 7 of scanning reflection mirror 15 reflections of hanging oneself, reflex to secondary mirror 6 through it, reflect to color separation film 8 by secondary mirror 6 again, be divided into reflection and transmission two road light by color separation film 8.One road reflected light is successively by behind first refractor 901 in the aberration correction lens combination 9, second refractor 902, through optical filter 10 imaging on picture planar detector 11.Another road transmitted light is successively by behind first refractor 1201 in the aberration correction lens combination 12, second refractor 1202, through optical filter 13 imaging on picture planar detector 14.
Said aberration correction lens combination 3,9,12 is used for proofreading and correct the off-axis aberration after light beam passes through principal reflection mirror 2,7 and secondary mirror 1,6, the remaining monochromatic aberration that also is used for corrective system itself simultaneously, they are made up of two refractors respectively, are spherical lens.
During aberration correction lens combination 9,12 design of the second spectroscopy system, material therefor is identical, and focal power is zero, can not play the deviation effect to light, therefore under achromatic situation, only produces monochromatic aberration.Color separation film 8 is adopted in the beam split of the second spectroscopy system, and first of color separation film 8 is reflecting surface and optical axis included angle 45 degree, and second is 0.178 degree with first depth of parallelism, is used to make the light path of marginal ray to increase, and reaches the purpose of the outer visual field of compensating shaft optical path difference.Wave band 3.5 μ m～12.0 μ m, 0.45 μ m～2.5 μ m that color separation film 8 and 3, the 9 and 12 selected material requirements of aberration correction lens combination are selected for use separately to them are transparent, as Ge crystal, quartz crystal.
First refractor 301,901,1201 in the aberration correction lens combination 3,9,12 and the achromatism condition of second refractor 302,902,1202 and focal power are distributed the requirement that should satisfy following formula:
h
301，901，1201 301，901，1201+h
302，902，1202 302，902，1202＝h
301，901，1201。Height when (2) symbol h represents each refractor of light incident in the formula, represents focal power, ν represents Abbe constant.Since =0, ν
301,90,12011=ν
302,902,1202, according to the requirement of formula (1), by each power of lens in the rational allocation achromatic correction mirror group 3,9,12, and control light height of incidence h
301,901,1201And h
302,902,1202, can eliminate the aberration of corrective lens (eye protection) group.
The advantage of optical system of the present invention is: system architecture is simple, compact, and processing, dress school technology maturation adopt the binocular refracting-reflecting optical system to reduce the difficulty in design of Optical System, processing and dress school on the whole.In first optical system, the long-wave band imaging detector concentrates on the focal plane, reduce optical element, improved the optical efficiency of system, can freeze to infrared eye with same refrigeration system, help reducing volume, weight, the power consumption of system, save cost.Adopt the mode of two optical systems of a scanning reflection mirror, avoid using the color separation film beam split, improved optical efficiency, reduced the coating process difficulty of optical filter, reduced the design of Optical System difficulty, replaced the convenient processing of non-spherical lens aberration correction with spherical lens.Optical system adopts with a kind of optical material, helps guaranteeing the stability of optical system to temperature.There is certain angle between second and first of color separation film, helps the balance aberration.The focal power of aberration correction lens combination is zero, has proofreaied and correct system's aberration.
Description of drawings
Fig. 1 is the optical system structure synoptic diagram,
Fig. 2 is the enlarged drawing of the first spectroscopy system among Fig. 1, among the figure:
D1 is secondary mirror 1 and principal reflection mirror 2 spacing distances;
D2 is secondary mirror 1 and aberration correction mirror group 3 spacing distances;
D3 is first refractor 301 and second refractor, 302 spacing distances of corrective lens (eye protection) group 3;
D4 is second refractor 302 and image planes 5 spacing distances;
R1 is the vertex curvature radius of secondary mirror 1;
R2 is the vertex curvature radius of principal reflection mirror 2;
R3011 is first refractor, the 301 front surface radius-of-curvature of corrective lens (eye protection) group 3;
R3012 is first refractor, the 301 rear surface radius-of-curvature of corrective lens (eye protection) group 3;
R3021 is second refractor, the 302 front surface radius-of-curvature of corrective lens (eye protection) group 3;
R3022 is second refractor, the 302 rear surface radius-of-curvature of corrective lens (eye protection) group 3;
Fig. 3 is the enlarged drawing of the second spectroscopy system among Fig. 1, among the figure:
D5 is secondary mirror 6 and principal reflection mirror 7 spacing distances;
D6 is secondary mirror 6 and color separation film 8 spacing distances;
D7 is first refractor, 901 spacing distances of color separation film 8 and corrective lens (eye protection) group 9;
D8 is first refractor 901 and second refractor, 902 spacing distances;
D9 is second refractor 902 and image planes 11 spacing distances;
D10 is first refractor, 1201 spacing distances of color separation film 8 and corrective lens (eye protection) group 12;
D11 is first refractor 1201 and second refractor, 1202 spacing distances of corrective lens (eye protection) group 12;
D12 is second refractor 1202 and image planes 14 spacing distances;
R6 is the vertex curvature radius of secondary mirror 6;
R7 is the vertex curvature radius of principal reflection mirror 7;
R9011 is first refractor, the 901 front surface radius-of-curvature of corrective lens (eye protection) group 9;
R9012 is first refractor, the 901 rear surface radius-of-curvature of corrective lens (eye protection) group 9;
R9021 is second refractor, the 902 front surface radius-of-curvature of corrective lens (eye protection) group 9;
R9022 is second refractor, the 902 rear surface radius-of-curvature of corrective lens (eye protection) group 9;
R12011 is first refractor, the 1201 front surface radius-of-curvature of corrective lens (eye protection) group 12;
R12012 is first refractor, the 1201 rear surface radius-of-curvature of corrective lens (eye protection) group 12;
R12021 is second refractor, the 1202 front surface radius-of-curvature of corrective lens (eye protection) group 12;
R12022 is second refractor, the 1202 rear surface radius-of-curvature of corrective lens (eye protection) group 12.
Embodiment
According to the optical system structure of Fig. 1, we have designed a broadband telescopic optical system, and picture element is near diffraction limit.The optical system technical indicator is as shown in table 1, and optical system specific design parameter is as shown in table 2.
The technical indicator of table 1 optical system
| Title | The telescope clear aperture | Operation wavelength | Relative aperture | Focal length | The visual field |
| The first spectroscopy system | φ300mm | 3.5μm～5.0μm、 8.0μm～12.0 | 1∶3.3 | 1000mm | 2.3° |
| The second spectroscopy system | φ120mm | 0.45μm～2.5 | 1∶5.83 | 700mm | 2.3° |
Table 2 optical system specific design parameter
| The element title | The face sequence number | Radius-of-curvature (mm) | Asphericity coefficient (e 2) | Interval or thickness (mm) | Aperture (mm) | Material | |
| The first spectroscopy system | | R2 | -483.107 | 1.129172 | 160(d1) | 300 | Quartzy |
| | R1 | -238.384 | 4.890628 | 171.97(d2) | 114 | Quartzy | |
| | R3011 | -91.422 | - | 9.316 | 60 | Germanium | |
| R3012 | -95.687 | - | 70.104(d3) | ||||
| | R3021 | -53.747 | - | 2.997 | 38 | Germanium | |
| R3022 | -69.003 | - | 26.054(d4) | ||||
| The second spectroscopy system | | R7 | -451.716 | 1.193938 | 139.991(d5) | 120 | Quartzy |
| | R6 | -253.528 | 5.471814 | 174.996(d6) | 51.8 | Quartzy | |
| Color separation film 8 | - | - | 3.5 | 39.2 | Quartzy | ||
| 0.178 degree (two face depth of parallelisms) | |||||||
| 54.996(d7) | |||||||
| 54.88(d10) | |||||||
| | R9011 | -59.942 | - | 3.496 | 31 | Quartzy | |
| R9012 | -99.839 | - | 14.41(d8) | ||||
| | R9021 | 83.733 | - | 5.727 | 29 | Quartzy | |
| R9022 | -184.424 | - | 12.82(d9) | ||||
| | R1211 | 59.008 | - | 3.92 | 32 | Quartzy | |
| R1212 | 122.828 | - | 8.96(d11) | ||||
| | R1221 | -97.229 | - | 9.43 | 29.8 | Quartzy | |
| R1222 | 112.643 | - | 12.96(d12) | ||||
Claims (3)
1. binocular refracting-reflecting optical system that is used for spaceborne multi-spectral imager, comprising: principal reflection mirror, secondary mirror and aberration correction lens combination is characterized in that:
Optical system from object space to picture side in order by a scanning reflection mirror (15), two spectroscopy systems are then arranged, the operation wavelength of the first spectroscopy system is 3.5 μ m～5.0 μ m and 8.0 μ m～12.0 μ m, and the operation wavelength of the second spectroscopy system is 0.45 μ m～2.5 μ m;
The first spectroscopy system is made up of a secondary mirror (1), a principal reflection mirror (2), an aberration correction lens combination (3) and optical filter (4) in order from object space to picture side;
The second spectroscopy system is divided into two tunnel color separation film (8) by a secondary mirror (6), a principal reflection mirror (7), one with this spectroscopy system from object space in order to picture side, and one the tunnel is that aberration correction lens combination (9) and optical filter (10), another road are aberration correction lens combination (12) and optical filter (13) composition;
Earth echo signal enters the first spectroscopy system and the second spectroscopy system respectively through scanning reflection mirror (15) reflection;
The first spectroscopy system: the earth echo signal directive principal reflection mirror (2) of the scanning reflection mirror of hanging oneself (15) reflection, reflex to secondary mirror (1) through it, reflect to picture side by secondary mirror (1) again, by behind first refractor (301) in the aberration correction lens combination (3), second refractor (302), go up imaging at picture planar detector (5) successively through optical filter (4);
The second spectroscopy system: the earth echo signal directive principal reflection mirror (7) of the scanning reflection mirror of hanging oneself (15) reflection, reflex to secondary mirror (6) through it, reflect to color separation film (8) by secondary mirror (6) again, be divided into reflection and transmission two road light by color separation film (8); One road reflected light by behind first refractor (901) in the aberration correction lens combination (9), second refractor (902), is gone up imaging through optical filter (10) at picture planar detector (11) successively; Another road transmitted light by behind first refractor (1201) in the aberration correction lens combination (12), second refractor (1202), is gone up imaging through optical filter (13) at picture planar detector (14) successively;
Said secondary mirror (1,6) is protruding hyperboloidal mirror, and principal reflection mirror (2,7) is recessed hyperboloidal mirror, and their curved surface is the standard quadric surface;
First refractor (301,901,1201) and second refractor (302,902,1202) of said aberration correction lens combination (3,9,12) are spherical lens.
2. according to a kind of binocular refracting-reflecting optical system that is used for spaceborne multi-spectral imager of claim 1, it is characterized in that: two surperficial depth of parallelism differences of said color separation film (8) are 0.178 degree.
3. according to a kind of binocular refracting-reflecting optical system that is used for spaceborne multi-spectral imager of claim 1, it is characterized in that: said aberration correction lens combination (3,9,12) has focal power , each refractor of forming it, i.e. the focal power of first refractor (301,901,1201) and second refractor (302,902,1202)
301,
901,
1201And
302,
902,
1202Distribution should satisfy the requirement of following formula:
h
301，901，1201 301，901，1201+h
302，902，1202 302，902，1202＝h
301，901，1201，(2)
Height when symbol h represents each refractor of light incident in the formula, v represents Abbe constant.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410066548 CN1257422C (en) | 2004-09-21 | 2004-09-21 | Binocular refracting-reflecting optical system for satellite multi-spectral imaging instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410066548 CN1257422C (en) | 2004-09-21 | 2004-09-21 | Binocular refracting-reflecting optical system for satellite multi-spectral imaging instrument |
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| CN1598638A CN1598638A (en) | 2005-03-23 |
| CN1257422C true CN1257422C (en) | 2006-05-24 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101498838B (en) * | 2009-03-04 | 2011-02-16 | 中国科学院上海技术物理研究所 | Aberration compensating method for 45 degree color separation filter transmission color separation light path |
| CN102116926B (en) * | 2009-12-31 | 2013-05-22 | 北京控制工程研究所 | Imaging structure of fixed star sensor |
| CN102004308B (en) * | 2010-09-09 | 2013-04-03 | 北京航空航天大学 | Multi-spectral imaging method and device for cassegrain telescope |
| CN102508361A (en) * | 2011-10-31 | 2012-06-20 | 北京空间机电研究所 | Spatial large view field, superwide spectral band and multispectral imaging optical system |
| CN102866490B (en) * | 2012-09-27 | 2014-12-10 | 中国科学院西安光学精密机械研究所 | Visible light, medium wave infrared and long wave infrared three-band optical imaging system |
| CN108802996B (en) * | 2018-06-08 | 2020-11-03 | 中国科学院紫金山天文台 | Three-mirror optical system of large-view-field telescope |
| CN110146971B (en) * | 2019-05-10 | 2024-05-31 | 中国科学院西安光学精密机械研究所 | Small-sized large-field tele camera optical system for cube satellite |
| WO2022109747A1 (en) | 2020-11-26 | 2022-06-02 | Broda Kurtis | Satellite with deployable optical assembly |
| CN114200668B (en) * | 2021-11-12 | 2024-08-30 | 中林信达（北京）科技信息有限责任公司 | Optical imaging system based on full sphere, dichroic mirror and dual point source detector |
| CN114296216B (en) * | 2021-12-14 | 2023-05-02 | 同济大学 | Refractive-reflective infrared polarization imaging optical system based on micro-scanning lens |
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