CN101975984B - Spherical focal plane-based sub viewing field step gaze imaging optical system - Google Patents
Spherical focal plane-based sub viewing field step gaze imaging optical system Download PDFInfo
- Publication number
- CN101975984B CN101975984B CN 201010291323 CN201010291323A CN101975984B CN 101975984 B CN101975984 B CN 101975984B CN 201010291323 CN201010291323 CN 201010291323 CN 201010291323 A CN201010291323 A CN 201010291323A CN 101975984 B CN101975984 B CN 101975984B
- Authority
- CN
- China
- Prior art keywords
- imaging
- focal plane
- optical system
- visual field
- mirror
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The invention belongs to the technical field of optical remote sensing imaging, and relates to a spherical focal plane-based sub viewing field step gaze imaging optical system. The system aims to solve the problem of defocusing produced by sub viewing field step directing in a converging light path. A unique spherical focal plane form is adopted in the main optical system, a planar directing mirror is arranged in the converging light path, and the distance between the directing mirror and a main optical focal plane is accordant with the curvature radius of the spherical focal plane so as to avoid the problem of defocusing produced due to the motion of the directing mirror in the converging light path; and different sub viewing fields in a full viewing field are introduced into a subsequent imaging light path one by one by two-dimensional step directing of the directing mirror, the imaging light path is divided into different channels by a light splitting assembly, and a correction lens set of each imaging channel finishes focal length control and field curvature equal aberration correction to match the scale of a detection device in each channel and realize a flat image field required by the detection device. The system breaks through the technical bottleneck that the scale of a surface array detector in large surface array gaze imaging application is limited, and realizes scanning coverage of the full viewing field by using a small surface array detector.
Description
Technical field
The invention belongs to the remote optical sensing technical field of imaging, relate to a kind of sub-visual field stepping staring imaging optical system based on the sphere focal plane.
Background technology
The remote optical sensing imaging field is more and more higher to the Capability Requirement of large fabric width staring imaging and multispectral section complex imaging, and the scale of existing face battle array focus planardetector far can't satisfy the demand of practical application, becomes gradually the bottleneck of restriction remote optical sensing imaging development.For solving the too little problem of planar array detector scale, technological means commonly used has both at home and abroad: planar array detector splicing and sub-visual field stepping staring imaging technology.
(1) planar array detector splicing
The planar array detector splicing has multiple means, comprise directly splice at focal plane, optics splicing etc.Focal plane direct splicing mode is mainly used in astronomical boundary, because this kind connecting method is difficult to avoid the slit between detector, thereby is not suitable for space optical remote sensor; The optics connecting method can be realized seamless spliced, but can cause the focal plane volume larger.For many imaging bands optical system, because follow-up optical system itself is just comparatively huge and complicated, be not suitable for adopting the optics connecting method; Simultaneously, because the planar array detector of large scale, space flight level is very expensive, this connecting method also can improve the cost of optical sensor greatly.
(2) sub-visual field stepping staring imaging technology
Sub-visual field stepping staring imaging technology is in the situation that the optical system visual field is enough, and the full visual field of imaging system is divided into some sub-visual fields, points to the sensing campaign of mirror by sub-visual field, and planar array detector is to each sub-visual field stepping staring imaging one by one.Because detector is sub-view field imaging to being divided into, so the device scale compares greatly with full visual field staring imaging and reduces, and the device fabrication manufacture difficulty is little.From should being used for of sub-visual field stepping staring imaging technology, owing in converging light path, using sensing mirror stepping imaging will cause the optical system out of focus, effectively imaging, existing sub-visual field stepping imaging optical system adopts the pattern of " preposition telescopic system+Focused Optical system " more, adopting coaxial three to be in the design of main optical instead, point to mirror and in the parallel light path of preposition telescopic system outgoing, carry out the stepping sensing, to avoid in Path of Convergent Rays because the optical system out of focus problem that causes is pointed in stepping.But in the reflective primary optical system of heavy caliber, to utilize preposition telescopic system to realize the compression parallel light path, greatly affect image quality thereby certainly will bring large system to block.
Summary of the invention
The present invention is for overcoming the prior art deficiency, a kind of sub-visual field stepping staring imaging optical system based on the sphere focal plane is provided, the technical matters that out of focus is pointed in the stepping of sub-visual field is carried out in solution in converging light path, avoid in reflective primary optical system being the problem such as realize that system that the compression parallel light path brings blocks, realize large visual field, hyperchannel staring imaging for the small-scale planar array detector technological approaches is provided.
The present invention is achieved in that the sub-visual field stepping staring imaging optical system based on the sphere focal plane, by pointing to the mirror step-scan, full visual field is divided into a plurality of sub-visual fields that Duplication is arranged, and each imaging band antithetical phrase visual field after the imaging, adopts the mode of Image Mosaics to obtain full view field image one by one; Wherein, the primary optical system focal plane is sphere, points to the plane mirror of mirror for arranging in converging light path.
Aforesaid sub-visual field stepping staring imaging optical system based on the sphere focal plane, wherein, primary optical system adopts coaxial three anti-designs, by the combination of spherical reflector and non-spherical reflector, realizes the main optical focal plane of sphere form.
Aforesaid sub-visual field stepping staring imaging optical system based on the sphere focal plane wherein, is pointed to mirror consistent with the radius-of-curvature of sphere focal plane to the distance of main optical focal plane.
Aforesaid sub-visual field stepping staring imaging optical system based on the sphere focal plane, wherein, pointing to mirror is that mirror is pointed on the two dimensional motion plane, by step-scan full visual field is divided into M * N the sub-visual field that certain Duplication is arranged.
Aforesaid sub-visual field stepping staring imaging optical system based on the sphere focal plane, wherein, by spectrum groupware system is divided into a plurality of imaging bands, each imaging band utilizes the focusing of correcting lens group to control, and aberration correction, obtain the required flattened field of detector.
Good effect of the present invention:
(1) optical imaging system of the present invention adopts sub-visual field stepping staring imaging pattern, can utilize low profile battle array focus planardetector to realize large-scale focal plane arrays (FPA) function, thereby breaks through the technical bottleneck of planar array detector in large face battle array imaging applications.
(2) son of the present invention is looked and is pointed to mirror and place and converge light path, has solved the problems such as large, that MTF is lower of blocking that the compression parallel light path brings in the reflective primary optical system.
(3) optical system of the present invention has solved and has pointed to mirror in converging light path system because the out of focus problem that produces is pointed in stepping by the sphere focal plane form of primary optical system uniqueness.
(4) optical system of the present invention is proofreaied and correct the curvature of field of main optical by the correcting lens group, has solved the problem of detector demand flattened field.
(5) optical system of the present invention utilizes sub-visual field directional mirror to each one by one imaging of sub-visual field, needn't move heavy object lens or object space scanning mirror, so that whole imaging system small light.
(6) optical system of the present invention has realized the complex imaging of different spectral coverage by the application of spectrum groupware and correcting lens group, and useful technological approaches is provided for the hyperchannel of remote optical sensing imaging is integrated.
(7) optical system of the present invention can be adjusted the integrated number that scale and minute optical channel are divided in sub-visual field according to demand, effectively the problem such as the large and integrated difficulty of system complex of the device scale demand in the large picture imaging of Solving Multichannel.The system scheme extensibility is strong, and economically feasible is applicable to utilize low profile battle array focal plane device to realize the multispectral section optical imaging system that large zone covers.
Description of drawings
Fig. 1 is that sub-visual field stepping gaze imaging system consists of schematic diagram;
Fig. 2 is coaxial three anti-primary optical system light path schematic diagram;
Fig. 3 is that stepping imaging schematic diagram is divided in 4 * 4 sub-visual fields.
Embodiment
The present invention is described further below in conjunction with the drawings and specific embodiments:
As shown in Figure 1, a kind of sub-visual field stepping staring imaging optical system based on the sphere focal plane proposed by the invention, comprise coaxial three preposition anti-primary optical systems, middle two-dimentional directional mirror system, spectrum groupware, the assemblies such as the sub-view field imaging channel correcting lens combination of back and corresponding planar array detector combine.
The principle of work of whole optical system is: target light enters coaxial three anti-primary optical systems, arrives two-dimentional directional mirror system through four secondary reflections; By pointing to the step motion of mirror, the light of each sub-visual field is introduced into the mirror of turning back one by one, and reflexes to spectrum groupware by it; Light enters separately imaging branch road after light splitting, and carries out focus controlling and aberration correction by the correcting lens group, at last imaging on planar array detector array separately.
Primary optical system adopts coaxial three anti-designs, and M1, M2, M3 are respectively principal reflection mirror, secondary mirror and three catoptrons, by the different spheres of three catoptrons and aspheric surface face type, reaches the combination of different spacing, can realize the primary optical system focal plane of sphere form; In coaxial three anti-configurations, adopt the known technological means of Optical System Design technical field namely can determine the systematic parameter of concrete composite demand.
M4, M6 are the plane mirror of turning back; M5 is that two dimensional surface points to mirror, is arranged in the primary optical system Path of Convergent Rays, and the scanning of finishing full visual field with the stepping scale of M * N covers, and it is consistent with the radius-of-curvature of sphere focal plane to the distance of main optical focal plane to point to mirror; Light path enters different imaging bands behind spectrum groupware M7, each passage all has corresponding correcting lens group to finish the correction of the aberrations such as focus controlling and the curvature of field, makes its coupling detector scale feature and required flattened field of device.
The entrance pupil of primary optical system is arranged on the primary mirror, pointing to mirror is set directly near the Path of Convergent Rays of emergent pupil, owing to adopting unique sphere focal plane design, and spherical radius equates with the distance of sensing mirror to focal plane, point to mirror in the Path of Convergent Rays system because the out of focus problem that produces is pointed in stepping thereby solved, also further reduce to point to simultaneously the mirror effective aperture, and this traditional design of having avoided heavy-caliber optical system to carry out scanning imagery in parallel light path is brought blocks the problems such as large, that MTF is lower, effectively promotes picture element.Primary optical system configuration and sphere focal plane schematic diagram are as shown in Figure 2.
Described optical system utilizes the correcting lens group of each imaging band to finish the focus controlling of each passage, and the curvature of field that primary optical system sphere focal plane produces is proofreaied and correct, and the engineering realizability is high, and cost is little.
As shown in Figure 3, this optical system adopt larger optics visual field, small-scale sensitive detection parts, the full optical imagery visual field of corresponding target area is divided into some sub-visual fields, point to the sensing campaign of mirror by sub-visual field, planar array detector is to each sub-visual field stepping staring imaging one by one.When the sensing mirror of described optical system is divided into full visual field M * N the sub-visual field that certain Duplication arranged and carries out imaging by step-scan, when the required planar array detector spare scale of system can be reduced to single battle array device and once covers full visual field 1/ of required scale (about M * N).This imaging mode has solved the large fabric width imaging problem that the extensive detector of common needs could be realized on the one hand preferably; Realize on the other hand according to different detection missions requirements imaging region size and imaging spectral coverage being carried out the demand of flexible configuration, greatly improved the system applies benefit.
More specifically, required design bore is 1m if the face battle array is stared optical system, adopts two spectral coverage imagings, and the focal length of imaging band 1 and imaging band 2 is respectively 10m, 8m, and full visual field is 0.77 ° * 0.77 °.Design primary optical system focal length is 10m, and principal reflection mirror M1 is ellipsoid, and radius-of-curvature is 1947mm, secondary mirror M2 is protruding hyperboloid, radius-of-curvature is 753mm, and three mirror M 3 are ellipsoid, and radius-of-curvature is 2019mm, primary and secondary mirror spacing 700mm, inferior three mirror spacing 2369mm, primary optical system focal plane radius-of-curvature is 1712mm, three mirrors are 3845mm to the spacing on sphere focal plane summit, the plane is pointed to mirror M5 center and is placed on 1712mm place before the sphere focal plane summit, and is identical with its radius-of-curvature.Therefore carry out the two dimension sensing when being incorporated into the sub-visual field of difference in the imaging optical path when pointing to mirror, can not produce the out of focus situation.Each channel correcting lens combination respectively focusing is carried out corresponding compression control, and aberration correction.
If the pixel dimension of the image device that two passages adopt is respectively 9 μ m * 9 μ m, 15 μ m * 15 μ m, for realizing that 0.77 ° * 0.77 ° visual field covers, if use single battle array device to cover full visual field, then the required device scale should reach respectively 15K * 15K, 7.2K * 7.2K (K refers to 1,000 pixels) at least.The sub-visual field stepping staring imaging mode that adopts this programme to propose, full visual field is divided into 4 * 4 totally 16 0.2 ° * 0.2 ° sub-visual fields, and 0.01 ° of monolateral stack is to be used for Image Mosaics between each sub-visual field, by scan mirror field rays is reflexed on the mirror of turning back one by one, and enter respective channel and carry out imaging, as shown in Figure 3.Because it is 3.9K * 3.9K, 1.9K * 1.9K that imaging band 1 and imaging band 2 are finished sub-visual field covering required device scale, therefore imaging band 1 and passage 2 only need adopt the sensitive detection parts of 4K * 4K and 2K * 2K, by 4 * 4 sub-visual field stepping staring imaging modes, can realize above-mentioned full visual field covering power.Consider to point to the stepping of mirror and stablize the process required times such as (in the 2s/ step), sub-visual field staring imaging (in the 1s/ subframe), finish the full view field image required time of single width and be about 46s.
Similarly, cover if realize ultra-large visual field, reach 1.15 ° * 1.15 ° such as the visual field demand, full visual field can be divided into 6 * 6 totally 36 sub-visual fields, adopt and above-mentioned consistent sub-visual field size, Duplication and sensitive detection parts, can satisfy full visual field and cover demand.And to adopt individual devices to the covering of full visual field, two imaging passages are respectively 22.4K * 22.4K, 10.8K * 10.8K to the scale demand of device.
This scheme can effectively be reduced the device scale demand, can obtain preferably imaging effect after the calibrated lens combination of each passage is proofreaied and correct, and whole system can realize with less cost the large picture staring imaging ability that many imaging bands are integrated, has preferably engineering realizability.
The above system is concrete condition of the invention process, those skilled in the art can according to realization thought of the present invention, carry out corresponding change design when facing the different application demand, as increase and decrease sub-visual field division number and passage number, to realize widely application.
Claims (3)
1. based on the sub-visual field stepping staring imaging optical system of sphere focal plane, by pointing to the mirror step-scan, full visual field is divided into a plurality of sub-visual fields that Duplication is arranged, and each imaging band antithetical phrase visual field after the imaging, adopts the mode of Image Mosaics to obtain full view field image one by one; It is characterized in that: the primary optical system focal plane is sphere, points to the plane mirror of mirror for arranging in converging light path; Primary optical system adopts coaxial three anti-designs, by the combination of spherical reflector and non-spherical reflector, realizes the main optical focal plane of sphere form; Pointing to mirror is that mirror is pointed on the two dimensional motion plane, by step-scan full visual field is divided into M * N the sub-visual field that certain Duplication is arranged.
2. the sub-visual field stepping staring imaging optical system based on the sphere focal plane according to claim 1 is characterized in that: point to mirror consistent with the radius-of-curvature of sphere focal plane to the distance of main optical focal plane.
3. the sub-visual field stepping staring imaging optical system based on the sphere focal plane according to claim 1, it is characterized in that: by spectrum groupware system is divided into a plurality of imaging bands, each imaging band utilizes the focusing of correcting lens group to control, and aberration correction, obtain the required flattened field of detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010291323 CN101975984B (en) | 2010-09-26 | 2010-09-26 | Spherical focal plane-based sub viewing field step gaze imaging optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010291323 CN101975984B (en) | 2010-09-26 | 2010-09-26 | Spherical focal plane-based sub viewing field step gaze imaging optical system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101975984A CN101975984A (en) | 2011-02-16 |
| CN101975984B true CN101975984B (en) | 2013-02-13 |
Family
ID=43575882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010291323 Expired - Fee Related CN101975984B (en) | 2010-09-26 | 2010-09-26 | Spherical focal plane-based sub viewing field step gaze imaging optical system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101975984B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3090136A1 (en) * | 2018-12-18 | 2020-06-19 | Thales | Enhanced Field of View Telescope |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608737B (en) * | 2012-03-19 | 2013-10-02 | 北京理工大学 | Extreme-ultraviolet-projection photoetching objective lens |
| CN104735321B (en) * | 2015-03-25 | 2017-08-29 | 北京空间机电研究所 | A kind of space TDICCD remote sensors optical bi-directional scanning system |
| IL254483B2 (en) | 2015-03-27 | 2024-01-01 | Drs Network And Imaging Systems Llc | Reflective telescope with wide field of view |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101285931A (en) * | 2008-05-30 | 2008-10-15 | 中国科学院上海技术物理研究所 | Multi-focus multi-visual field primary occlusion total reflection type astigmatism-free optical system |
| CN100504495C (en) * | 2007-11-27 | 2009-06-24 | 北京空间机电研究所 | Relay scanning imaging optical system of space large caliber compression light beam |
-
2010
- 2010-09-26 CN CN 201010291323 patent/CN101975984B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100504495C (en) * | 2007-11-27 | 2009-06-24 | 北京空间机电研究所 | Relay scanning imaging optical system of space large caliber compression light beam |
| CN101285931A (en) * | 2008-05-30 | 2008-10-15 | 中国科学院上海技术物理研究所 | Multi-focus multi-visual field primary occlusion total reflection type astigmatism-free optical system |
Non-Patent Citations (1)
| Title |
|---|
| 雷华等.光学拼接成像系统.《仪器仪表学报》.2010,第31卷(第6期),1213-1215. * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3090136A1 (en) * | 2018-12-18 | 2020-06-19 | Thales | Enhanced Field of View Telescope |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101975984A (en) | 2011-02-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9860443B2 (en) | Monocentric lens designs and associated imaging systems having wide field of view and high resolution | |
| US9071742B2 (en) | Optical imaging with foveation | |
| AU2008288212B2 (en) | Imaging device | |
| CN103064171B (en) | Novel high resolution large visual field optical imaging system | |
| US20160232257A1 (en) | Method for designing off-axial optical system with freeform surface | |
| US10209439B2 (en) | Multi-directional optical receiver and method | |
| US8836794B2 (en) | Dual field of view multi-band optics | |
| CN101975984B (en) | Spherical focal plane-based sub viewing field step gaze imaging optical system | |
| CN103309019A (en) | Optical system of ultraviolet multi-band panoramic imaging instrument | |
| US9921396B2 (en) | Optical imaging and communications | |
| CN101685203B (en) | Infrared mosaic imaging device | |
| CN107121769A (en) | A kind of long wave linear array type scanned infrared imaging optical system | |
| US20150346582A1 (en) | Omnidirectional imaging device | |
| CN101874218B (en) | Dual focal length lens system | |
| CN103135231A (en) | Zoom illuminating system and imaging apparatus employing the same | |
| CN103777350B (en) | A kind of three-mirror reflection variable focal length optical system based on photo-isomerisable material | |
| CN206292033U (en) | A kind of multispectral reflective parallel light pipe | |
| Ju et al. | Optical design of reflecting omnidirectional zoom optical system with peripheral half-field of view from 110 to 72 for day and night surveillance | |
| KR102209218B1 (en) | Short Wave Infrared Camera Optical System for The Long Range Image Monitoring | |
| Mohammad Nejad et al. | Design and performance analysis of a fisheye-based optical head for an imaging laser detecting system | |
| US11221468B2 (en) | Optical imaging module having a hyper-hemispherical field and controlled distortion and compatible with an outside environment | |
| CN101221350B (en) | Image surface partitioning multi-optical channel common image surface imaging device | |
| US20180343396A1 (en) | Reflective truncated ball imaging system | |
| KR102258458B1 (en) | Omnidirectional zoom optical system that can be used in day and night and can change magnification | |
| Pernechele | Hyper-hemispheric and bifocal panoramic lenses |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130213 Termination date: 20190926 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |