CN202024818U - Shared view filed and aperture multispectral imaging system with cassegrain type front end - Google Patents
Shared view filed and aperture multispectral imaging system with cassegrain type front end Download PDFInfo
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- CN202024818U CN202024818U CN2011200292514U CN201120029251U CN202024818U CN 202024818 U CN202024818 U CN 202024818U CN 2011200292514 U CN2011200292514 U CN 2011200292514U CN 201120029251 U CN201120029251 U CN 201120029251U CN 202024818 U CN202024818 U CN 202024818U
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Abstract
The utility model discloses a shared view filed and aperture multispectral imaging system with a cassegrain type front end, which comprises a primary mirror, a refraction and reflection dual-purpose secondary mirror, a medium wave, long-wavelength infrared or medium-long wavelength infrared dual range imaging mirror group, a medium wave, long-wavelength infrared or medium-long wavelength infrared two-color detector unit, a visible-to-near infrared waveband imaging mirror group, a visible-to-near infrared waveband color separation device and a detection unit, wherein the primary mirror is provided with a central open pore; the reflection surface of the primary mirror is a concave surface; and the incident surface of the refraction and reflection dual-purpose secondary mirror is a convex surface. In the system, the primary mirror is used as a common entrance pupil of each waveband; the primary light separation is realized by using the secondary mirror, so that the utilization rate of light energy is improved; the spaces of a spectroscope and the system are saved; the system is conductive to realize great aperture and wider view field; and the imaging quality is remarkably improved. The coaxial shared view field imaging ensures that the image is easy to register.
Description
Technical field
The utility model relates to a kind of multi-optical spectrum imaging system, relates in particular to a kind of common visual field with Cassegrain type front end and is total to the aperture multi-optical spectrum imaging system.
Background technology
Multi-optical spectrum imaging system utilizes the spectral characteristic of object, image by receiving target thing different spectral coverage, reach the purpose of recognition object, understanding object character, be widely used in fields such as space remote sensings, as be used for terrain classification, vegetation, desertification, disease and pest, water pollution, marine ecology, fire, mineral products analysis monitoring etc.
Multi-optical spectrum imaging system need be in a plurality of spectrum segments to the imaging simultaneously of same target, and its optical texture can be divided into following several types:
A kind of is that single-lens simple detector color filter is wheeled, the color filter wheel can be adorned the color filter of a plurality of different-wavebands, its spectral response can be selected by the user, obtain the image of some spectral coverages by the rotation of color filter wheel, total imaging spectral coverage scope is subjected to the restriction of the spectral response range of detector, and it is poor that the rotation life period of taking turns because of color filter is obtained in the imaging of each spectral coverage.Add filter arrays in the CCD front similarly.
Second kind is that many camera lenses add color filter type, and promptly a plurality of camera lenses are to same target imaging, and each camera lens receives a spectral coverage.As application number is the disclosed multi-optical spectrum imaging system of Chinese utility application of 200810052147.X, with Image coupler 4 camera lens imagings is coupled to same image planes, and the selection of spectrum realizes by the bandpass filter of front end.This system be suitable for total spectral range little, can be with a kind of situation of imageing sensor reception.When spectral range during than broad, each spectral coverage must adopt different detectors, it as application number 200410066548.2 the disclosed multi-optical spectrum imaging system of Chinese utility application, adopt multi-lens imaging and in conjunction with beam split, the imaging spectral coverage is from the visible light to the LONG WAVE INFRARED, wherein scanning reflection mirror is that two camera lenses are shared, the operation wavelength of the 1st camera lens is 3 μ m～5 μ m and 8 μ m～12 μ m, the operation wavelength of the 2nd camera lens is 0.45 μ m～2.5 μ m, and be divided into two spectral coverages by color separation film, band-pass filter is set in each spectral coverage again realizes multispectral section imaging.Because there is parallax in each camera lens, need carry out field of view (fov) registration to image.
The third is single-lens many CCD beam splitting type, and as the MS4100 system that U.S. DuneanTech company releases, owing to the light transmissive material difference of different spectral coverage employing, so the optical texture that aberration correction adopted is also variant.
In the space remote sensing field the 4th type commonly used, i.e. the front end of sharing lens is in repeatedly beam split and add the aberration correction imaging system and realize multispectral imaging thereafter, to realize aperture altogether, common visual field.The space remote sensing telescope front end that is used for multispectral imaging has dioptric system and reflecting system, and the system front end that need satisfy the requirement of long-focus high-resolution is normally reflective, comprises the Cassegrain type front end and from axle three transoids.Using the space remote sensing telescope of Cassegrain type front end to have the characteristics of compact conformation under the long-focus, is the main flow in long-focus, the high-resolution space camera.May nineteen ninety-five, the U.S. launched the 3rd generation GOES series satellite GOES-J, imager on it comprises that visible light and centre wavelength are infrared band totally 5 passages of 3.9 μ, 6.75 μ, 10.7 μ and 12 μ, its front end is a Cassegrain system, optical system is entitled as " The GOESImager:overview and evolutionary development " (Proc.of SPIE by Kathleen A.Hursen and Robert W.Ross's, 1996, article 2812:160-173) is open.Spectroscope wherein is tilted-putted flat board, needs in the plating reflection thereon, LONG WAVE INFRARED, the rete of visible light transmissive, because light is on this spectroscope and non-normal incidence, the incident angle conference influences the reflectivity of visible light transmittance and infrared light.Simultaneously, owing to the asymmetry of the outer light of axle by tilt flat plate, aberration is difficult to proofread and correct, and very little visual field can only be arranged.10 wave bands on the FY-1C weather satellite of China are visible-and infrared scanning radiometer also adopted this class formation, its instantaneous field of view has only 0.072 degree (Gong Huixing etc., 10 wave bands on the FY-1C weather satellite are visible-infrared scanning radiometer, infrared and millimeter wave journal, 2000,19 (5): 321-326).Use Amici prism to replace oblique dull and stereotyped beam split can avoid this problem, but can increase the load of system.Therefore some design makes the primary and secondary mirror constitute telescopic system, it is secondary mirror outgoing directional light, make oblique flat board not produce the asymmetric aberration influence, but this way can make the center drilling of primary mirror bigger, make the veiling glare outside the visual field directly leak the into imaging mirror group of back by perforate without the primary and secondary mirror reflection, make image planes the veiling glare noise occur, need to adopt additional load to reduce or eliminate veiling glare.
Summary of the invention
The utility model provides a kind of common visual field with Cassegrain type front end to be total to the aperture multi-optical spectrum imaging system, primary mirror is as the public entrance pupil of each wave band, utilize secondary mirror to realize a beam split, improved the efficiency of light energy utilization, spectroscope and system space have been saved, help realizing large aperture and bigger visual field, image quality significantly improves; And, be total to view field imaging with optical axis and make image be easy to registration.
A kind of common visual field with Cassegrain type front end is total to the aperture multi-optical spectrum imaging system, comprising:
Primary mirror is used for incident beam is reflected, and its reflecting surface is a concave surface, also is provided with center drilling on the described primary mirror;
Secondary mirror is used for the light beam that is reflected by described primary mirror is reflected and reflects; Wherein, to as seen reflecting to near-infrared band in the light beam that is reflected by described primary mirror, obtain folded light beam, its folded light beam is through the center drilling outgoing of described primary mirror; Reflect with LONG WAVE INFRARED the medium wave in the light beam that is reflected by described primary mirror is infrared, obtain deflecting light beams; Described secondary mirror is coaxial with described primary mirror;
The first imaging mirror group and first detector, be used to expand visual field and imaging, make folded light beam by described secondary mirror outgoing after described primary mirror center drilling incides the described first imaging mirror group, shine again on the light-sensitive surface of described first detector and finish imaging; Wherein, by the folded light beam of described secondary mirror outgoing for as seen to near-infrared band, described first detector is as seen to the combination of near-infrared band color separation device and probe unit;
The second imaging mirror group and second detector are used to expand visual field and imaging, make that deflecting light beams by described secondary mirror outgoing incides the described second imaging mirror group after, shine again on the light-sensitive surface of described second detector and finish imaging; Wherein, be medium wave infrared band, long wave infrared region or middle LONG WAVE INFRARED two waveband by the deflecting light beams of described secondary mirror outgoing, described second detector is medium wave infrared eye, Long Wave Infrared Probe or middle LONG WAVE INFRARED double-color detector.
Wherein, the wavelength coverage of each wave band is:
As seen to near-infrared band: 0.45 μ m～1.0 μ m,
The medium wave infrared band: 3 μ m～5 μ m,
Long wave infrared region: 8 μ m～12 μ m.
In the optimized technical scheme, in the described secondary mirror, being convex surface near the surface (plane of incidence) of described primary mirror, be concave surface away from the surface of described primary mirror, and the radius-of-curvature of the concave surface of described secondary mirror is less than the radius-of-curvature of the convex surface of described secondary mirror.
In the optimized technical scheme, described secondary mirror is used for the material of the infrared and LONG WAVE INFRARED of transmission medium wave, and at it near being coated with the rete that is used for reflecting as seen near infrared light and transmission LONG WAVE INFRARED light on surface of primary mirror.
In the optimized technical scheme, described second detector is the refrigeration mode detector, the described second imaging mirror group is made up of relay lens group and secondary imaging mirror group, make by the deflecting light beams XianCheng of described secondary mirror outgoing once as, again through the imaging on the refrigeration mode detector of secondary imaging mirror group, secondary mirror and once as between add the relay lens group, primary mirror is as the aperture diaphragm of system, the imaging on the cold screen of refrigeration mode detector by relay lens group and secondary imaging mirror group is to realize 100% cold stop efficient.
Described second detector also can adopt the non-refrigeration type detector, and the at this moment described second imaging mirror group needn't be divided into relay lens group and secondary imaging mirror group, as long as a set of contact lenses is used to expand visual field and imaging.
Common visual field with Cassegrain type front end of the present utility model is total to the aperture multi-optical spectrum imaging system, and front end comprises primary mirror and catadioptric dual-purpose type secondary mirror, and primary mirror is the aperture diaphragm of total system.Primary mirror is the public entrance pupil of each light path of total system, and system has identical entrance pupil diameter during to the same target imaging in space.
Wherein, infrared and light path long wave infrared region of medium wave is: from the incident beam of target after primary mirror reflection, secondary mirror refraction again through second imaging mirror group imaging on second detector.When second detector adopts the refrigeration mode detector, the second imaging mirror group is made of relay lens group and secondary imaging mirror group, the refract light XianCheng of secondary mirror once as, again through the imaging on the refrigeration mode detector of secondary imaging mirror group, secondary mirror and once as between add the relay lens group, primary mirror is as the aperture diaphragm of system, and the imaging on the cold screen of refrigeration mode detector by relay lens group and secondary imaging mirror group realizes 100% cold stop efficient.
Wherein, as seen the light path to near-infrared band is: the incident beam from target reflects and time mirror reflection through primary mirror successively, center drilling by primary mirror penetrates again, and, between the first imaging mirror group and first detector, can lay the colour filter runner as required again through first imaging mirror group imaging on first detector.
In the utility model, the effect of the described first imaging mirror group is expansion Cassegrain system visual field, improves the outer view field imaging quality of axle; The effect of the described second imaging mirror group is expansion Cassegrain system visual field, the image quality of the outer visual field of improvement system axle; And when the infrared eye that adopts refrigeration, the unthreaded hole that aperture diaphragm can also be located on the primary mirror is imaged on the cold screen of refrigerated infrared detector, under the situation that does not increase the primary mirror bore, realizes 100% cold stop efficient.
Owing in each wave band light path, all be provided with imaging mirror group, come the expanding system visual field, so each wave band light path can have different focal lengths and detector size, thereby can have the field angle of different sizes.As seen if be 2W to the field angle maximum of near-infrared band and medium wave long wave infrared region
Max, that minimum is 2W
Min, 2W then
MaxThe field range imaging comprises 2W
MinField range, and 2W
MinThe visual field is at 2W
MaxImaging is positioned at 2W in the light path of visual field correspondence
MaxThe middle part of field image.
In order to reduce system bulk, several plane mirrors can be set in system carry out the light path turnover, do not influence the basic ideas that each optical unit of native system is arranged like this, do not influence the alignment of system yet.
Need to prove: no matter whether the second imaging mirror group adopt the refrigeration mode detector, and the second imaging mirror group all should be positioned at outside the input path of primary mirror, can not be arranged in the input path of primary mirror, to avoid blocking the incident light of primary mirror.If adopt the refrigeration mode detector, primary mirror should imaging in the cold screen place of the second imaging mirror group at second detector as entrance pupil.
Multi-optical spectrum imaging system of the present utility model, has the Cassegrain type front end, can realize same target is total to aperture imaging in the visual field altogether, primary mirror is as the public entrance pupil of each spectral coverage, utilize a secondary mirror realization beam split coaxial with primary mirror, not only improved the efficiency of light energy utilization, and because folded light beam incident angle on secondary mirror of primary mirror is little, make that to be used for the short rete visible and near infrared light of transmission LONG WAVE INFRARED and reflection wavelength at secondary mirror near plating on the plane of incidence of primary mirror relatively easy, with utilize tilted-putted spectroscope beam split to compare, can significantly improve the transmissivity and the catoptrical reflectivity of transmitted light.Multi-optical spectrum imaging system of the present utility model is used for the space remote sensing multispectral imaging and more helps realizing large aperture and bigger visual field, and image quality significantly improves.View field imaging makes image be easy to registration altogether, and the image of same in theory each spectral coverage of target is with optical axis.
Description of drawings
Fig. 1 is the structural representation that the common visual field with Cassegrain type front end of the present utility model is total to the aperture multi-optical spectrum imaging system.
Embodiment
Describe the utility model in detail below in conjunction with embodiment and accompanying drawing, but the utility model is not limited in this.
As shown in Figure 1, a kind of common visual field with Cassegrain type front end is the aperture multi-optical spectrum imaging system altogether, comprising: have center drilling and reflecting surface and be the primary mirror 2 of concave surface, catadioptric dual-purpose type secondary mirror 1 that the plane of incidence is convex surface, first plane mirror 5, as seen to near-infrared band imaging mirror group 3, as seen to near-infrared band color separation device and probe unit 4, second plane mirror 13, the 3rd plane mirror 10, relay lens group 11, the infrared secondary imaging mirror of medium wave group 8 and refrigeration mode medium wave infrared eye 7.
Wherein, 2 pairs of incident beams of primary mirror reflect; 1 pair of light beam that is reflected by primary mirror 2 of secondary mirror reflects and reflects; Wherein, to as seen reflecting to near-infrared band in the light beam that is reflected by primary mirror 2, obtain folded light beam, this folded light beam is through the center drilling outgoing of primary mirror 2; Reflect with LONG WAVE INFRARED the medium wave in the light beam that is reflected by primary mirror 2 is infrared, obtain deflecting light beams;
As seen to near-infrared band imaging mirror group 3 and as seen to near-infrared band color separation device and probe unit 4 be the first imaging mirror group and first detector, be used to expand visual field and imaging, make by as seen the inciding as seen to near-infrared band imaging mirror group 3 through primary mirror 2 center drillings to the near-infrared band folded light beam of secondary mirror 1 outgoing, shine again as seen and to the light-sensitive surface of near-infrared band color separation device and probe unit 4, finish imaging; As seen to near-infrared band: 0.45 μ m～1.0 μ m;
The infrared secondary imaging mirror of relay lens group 11 and medium wave group 8 is formed medium wave infrared imaging mirror group 12, medium wave infrared imaging mirror group 12 and refrigeration mode medium wave infrared eye 7 are the second imaging mirror group and second detector, be used to expand visual field and imaging, make incide medium wave infrared imaging mirror group 12 by the medium wave infrared band in the deflecting light beams of secondary mirror 1 outgoing after, shine again on the light-sensitive surface of refrigeration mode medium wave infrared eye 7 and finish imaging.Medium wave infrared band: 3 μ m～5 μ m.
In the system, first plane mirror 5, second plane mirror 13 and the 3rd plane mirror 10 are set for reducing the system bulk light path of transferring, and do not influence the basic ideas that each optical unit of native system is arranged, and also do not influence the alignment of system.
The incident beam that the same target in space is sent is earlier through primary mirror 2 reflections, be incident in catadioptric dual-purpose type secondary mirror 1 then, be divided into two-way: as seen to the light of near-infrared band after the reflection of secondary mirror 1 place, incide through as seen to near-infrared band imaging mirror group 3 through primary mirror 2 center drillings, arrive again as seen to near-infrared band color separation and probe unit 4; The medium wave infrared light is in secondary mirror 1 refraction, arrive refrigeration mode medium wave infrared eyes 7 through medium wave infrared imaging mirror group 12 again: thing at a distance earlier through primary mirror 2, secondary mirror 1 and relay lens group 11 become at image planes 9 place once as, image in the light-sensitive surface of refrigeration mode medium wave infrared eye 7 again through secondary imaging mirror group 8, primary mirror 2 is as the entrance pupil of system simultaneously, image in cold screen 6 places of refrigeration mode medium wave infrared eye 7 through medium wave infrared imaging mirror group 12, realize 100% cold stop efficient.
Each wave band light path can have different focal lengths and detector size, thereby can have the field angle of different sizes.As seen if be 2W to the field angle maximum of near-infrared band and medium wave long wave infrared region
Max, that minimum is 2W
Min, then 2
MaxLook X field scope imaging and comprise 2W
MinField range, and 2W
MinThe visual field is at 2W
MaxImaging is positioned at 2W in the light path of visual field correspondence
MaxThe middle part of field image.
In the foregoing description, refrigeration mode medium wave infrared eye 7 can substitute with LONG WAVE INFRARED double-color detector in refrigeration mode Long Wave Infrared Probe or the refrigeration mode, correspondingly, medium wave infrared imaging mirror group 12 is LONG WAVE INFRARED imaging mirror group or middle LONG WAVE INFRARED imaging mirror group, is used for LONG WAVE INFRARED or LONG WAVE INFRARED dual-waveband imaging.Long wave infrared region: 8 μ m～12 μ m.
Claims (6)
1. the common visual field with Cassegrain type front end is total to the aperture multi-optical spectrum imaging system, it is characterized in that, comprising:
Primary mirror is used for incident beam is reflected, and its reflecting surface is a concave surface, also is provided with center drilling on the described primary mirror;
Secondary mirror is used for the light beam that is reflected by described primary mirror is reflected and reflects; Wherein, to as seen reflecting to near-infrared band in the light beam that is reflected by described primary mirror, obtain folded light beam, its folded light beam is through the center drilling outgoing of described primary mirror; Reflect with LONG WAVE INFRARED the medium wave in the light beam that is reflected by described primary mirror is infrared, obtain deflecting light beams;
The first imaging mirror group and first detector, be used to expand visual field and imaging, make folded light beam by described secondary mirror outgoing after described primary mirror center drilling incides the described first imaging mirror group, shine again on the light-sensitive surface of described first detector and finish imaging; Wherein, by the folded light beam of described secondary mirror outgoing for as seen to near-infrared band, described first detector is as seen to the combination of near-infrared band color separation device and probe unit;
The second imaging mirror group and second detector are used to expand visual field and imaging, make that deflecting light beams by described secondary mirror outgoing incides the described second imaging mirror group after, shine again on the light-sensitive surface of described second detector and finish imaging; Wherein, be medium wave infrared band, long wave infrared region or middle LONG WAVE INFRARED two waveband by the deflecting light beams of described secondary mirror outgoing, described second detector is medium wave infrared eye, Long Wave Infrared Probe or middle LONG WAVE INFRARED double-color detector.
2. the common visual field with Cassegrain type front end as claimed in claim 1 is total to the aperture multi-optical spectrum imaging system, it is characterized in that, describedly as seen to the near-infrared band scope be: 0.45 μ m～1.0 μ m, described medium wave infrared band scope is: 3 μ m～5 μ m, described long wave infrared region scope is: 8 μ m～12 μ m.
3. the common visual field with Cassegrain type front end as claimed in claim 1 or 2 is total to the aperture multi-optical spectrum imaging system, it is characterized in that, in the described secondary mirror, surface near described primary mirror is a convex surface, surface away from described primary mirror is a concave surface, and the radius-of-curvature of the concave surface of described secondary mirror is less than the radius-of-curvature of the convex surface of described secondary mirror.
4. the common visual field with Cassegrain type front end as claimed in claim 1 or 2 is total to the aperture multi-optical spectrum imaging system, it is characterized in that, described secondary mirror is used for the material of the infrared and LONG WAVE INFRARED of transmission medium wave, and at it near being coated with the rete that is used for reflecting as seen near infrared light and transmission LONG WAVE INFRARED light on surface of described primary mirror.
5. the common visual field with Cassegrain type front end as claimed in claim 1 or 2 is total to the aperture multi-optical spectrum imaging system, it is characterized in that described second detector is the refrigeration mode detector, and the described second imaging mirror group is made up of relay lens group and secondary imaging mirror group.
6. the common visual field with Cassegrain type front end as claimed in claim 1 or 2 is total to the aperture multi-optical spectrum imaging system, it is characterized in that, lays the colour filter runner between described first imaging mirror group and described first detector.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102175318A (en) * | 2011-01-27 | 2011-09-07 | 浙江大学 | Mutually-visual-field common-aperture multi-spectral imaging system with Cassegrain front end |
| CN102721677A (en) * | 2012-06-15 | 2012-10-10 | 中国科学院物理研究所 | Fluorescent spectroscope with non-collinear optical parametric amplification function |
| CN104297910A (en) * | 2014-09-03 | 2015-01-21 | 长春理工大学 | Multi-wavelength composite beam splitting and receiving device |
| RU178354U1 (en) * | 2017-10-30 | 2018-03-30 | Акционерное общество "Научно-производственное объединение "Государственный институт прикладной оптики" (АО "НПО ГИПО") | TWO-CHANNEL MIRROR AND LENS SYSTEM |
| RU2672703C1 (en) * | 2017-10-30 | 2018-11-19 | Акционерное общество "Научно-производственное объединение "Государственный институт прикладной оптики" (АО "НПО ГИПО") | Two-channel mirror-lens system |
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- 2011-01-27 CN CN2011200292514U patent/CN202024818U/en not_active Expired - Fee Related
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| CN102175318A (en) * | 2011-01-27 | 2011-09-07 | 浙江大学 | Mutually-visual-field common-aperture multi-spectral imaging system with Cassegrain front end |
| CN102721677A (en) * | 2012-06-15 | 2012-10-10 | 中国科学院物理研究所 | Fluorescent spectroscope with non-collinear optical parametric amplification function |
| CN102721677B (en) * | 2012-06-15 | 2014-11-05 | 中国科学院物理研究所 | Fluorescent spectroscope with non-collinear optical parametric amplification function |
| CN104297910A (en) * | 2014-09-03 | 2015-01-21 | 长春理工大学 | Multi-wavelength composite beam splitting and receiving device |
| RU178354U1 (en) * | 2017-10-30 | 2018-03-30 | Акционерное общество "Научно-производственное объединение "Государственный институт прикладной оптики" (АО "НПО ГИПО") | TWO-CHANNEL MIRROR AND LENS SYSTEM |
| RU2672703C1 (en) * | 2017-10-30 | 2018-11-19 | Акционерное общество "Научно-производственное объединение "Государственный институт прикладной оптики" (АО "НПО ГИПО") | Two-channel mirror-lens system |
| RU2776633C1 (en) * | 2021-09-22 | 2022-07-22 | Публичное акционерное общество "Ростовский оптико-механический завод" | Surveillance device: sight with remote control |
| CN114326069A (en) * | 2021-12-06 | 2022-04-12 | 北京空间机电研究所 | Long-wave infrared multi-temperature-zone free-form surface off-axis catadioptric optical system |
| CN114326069B (en) * | 2021-12-06 | 2024-03-26 | 北京空间机电研究所 | Long-wave infrared multi-temperature-zone free-form surface off-axis refraction and reflection optical system |
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