CN106125280A - Zigzag type optical system for field stitching - Google Patents
Zigzag type optical system for field stitching Download PDFInfo
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- CN106125280A CN106125280A CN201610688757.3A CN201610688757A CN106125280A CN 106125280 A CN106125280 A CN 106125280A CN 201610688757 A CN201610688757 A CN 201610688757A CN 106125280 A CN106125280 A CN 106125280A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0852—Catadioptric systems having a field corrector only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
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Abstract
The present invention relates to remote sensing field, disclosing a kind of Zigzag type optical system for field stitching, described optical system includes: cylindricality splicing optical window, plane of scanning motion reflecting mirror, planar annular reflecting mirror, concave surface principal reflection mirror, rhombic prism and image transferring lens group；Wherein, the center of planar annular reflecting mirror is provided with through hole, the light of entrance cylindricality splicing optical window sequentially passes through the triple reflection of plane of scanning motion reflecting mirror, planar annular reflecting mirror and concave surface principal reflection mirror and forms light of turning back, light of turning back is by the imaging at rhombic prism of this through hole, and rhombic prism carries out visual field segmentation and sends into image transferring lens group and carry out image-receptive imaging.The optical system of the present invention use the method for optical field of view splicing to solve heavy caliber optical window difficulty of processing is big, large scale sensor process is difficult and the problem such as somewhat expensive, can be widely used for infrared early warning platform.
Description
Technical field
The present invention relates to for remote sensing field, a kind of Zigzag type optics for field stitching
System.
Background technology
Along with the development of remote sensing satellite application technology, big visual field, High Resolution Space Camera have become as development trend, mesh
In front remote sensing equipment, the big view field image acquisition mode of more employing is: use heavy caliber infrared window to carry out infra-red radiation
Detection；Large-size images sensor is used to carry out image-receptive；Use the field stitching method of mechanical splice, i.e. use machinery dress
Put and in image planes, multi-disc imageing sensor is closely spaced.
Current big visual field remote sensing satellite camera the most all uses such scheme to obtain high-resolution big view field image.Its
In, the advantage of mechanical splice is that the optical system using the camera of mechanical splice is relatively simple, it is easy to accomplish.
But, there are some obvious shortcomings in existing remote sensing the most simultaneously, be embodied in following some:
1, being limited by processing technique and cost, it is too big that heavy caliber infrared window can not do, and detection is red i.e. every time
External radiation amount is limited；
2, limited the size of imageing sensor by technique and can not be made very big, that i.e. single receives image resolution ratio
Limited；Front 2 restrictions cause existing high-resolution big view field image must be realized by connecting method；
But 3, current mechanical splice mode there is also problems, and most typically ground such as image quality is difficult to control to, warp
It is commonly present the flaw of splicing seams；Additionally the cost of mechanical splice device is the most expensive.
Summary of the invention
For the drawbacks described above of prior art, the technical problem to be solved is how to realize convenient and high-quality
Big view field image splicing.
For solving above-mentioned technical problem, the invention provides a kind of Zigzag type optical system for field stitching, described
Optical system includes:
Cylindricality is spliced optical window, plane of scanning motion reflecting mirror, planar annular reflecting mirror, concave surface principal reflection mirror, rhombic prism and turns
As mirror group；Wherein,
The center of described planar annular reflecting mirror is provided with through hole, and the light entering described cylindricality splicing optical window sequentially passes through institute
The triple reflection stating plane of scanning motion reflecting mirror, described planar annular reflecting mirror and described concave surface principal reflection mirror forms light of turning back, institute
Stating light of turning back by the imaging at described rhombic prism of described through hole, described rhombic prism carries out visual field segmentation to imaging and sends into
Described image transferring lens group carries out image-receptive.
Further, in described optical system:
Described plane of scanning motion reflecting mirror is arranged in the inside of described cylindricality splicing optical window, splices optical window with entering described cylindricality
Light be 45 degree of angles；
Described planar annular reflecting mirror is vertical with described plane of scanning motion reflecting mirror, and the center of area line of two plane mirrors with
Just secondary reflection parallel light；
The central shaft of described concave surface principal reflection mirror by the center of area of described planar annular reflecting mirror and with two plane mirrors
Center of area line vertical.
Further, in described system:
Imaging after the light inlet field of view of receiver segmentation of described image transferring lens group, light-emitting window connects Infrared Detectors.
Further, in described system:
Described image transferring lens group has multiple.
Further, the number of described image transferring lens group is identical with the visual field segmentation number that described rhombic prism realizes.
Further, each imaging after multiple described image transferring lens groups receive the segmentation of described visual field respectively carries out image spelling again
Connect.
Further, described image transferring lens group includes aberration correction mirror group and optical beam transformation mirror group.
Further, described image transferring lens group is made up of multiple lens.
Further, described concave surface principal reflection mirror is a spherical reflector.
Further, described rhombic prism is arranged at image planes.
The invention provides a kind of Zigzag type optical system for field stitching, which solve following problem:
1, use splicing optical window to meet system and carry out fast search remote, omnibearing, and solve super large caliber light
Window is difficult to the difficulty of processing；
2, use polylith to receive as sensor, then the image received by imageing sensor carries out splicing and can be obtained by greatly
The image of visual field, solves the problem limited by the dimension process of sensor；
3, reuse prism and carry out visual field segmentation, visual field is divided into different locus, with polylith as sensor
Receive, then the image received by imageing sensor splices, the problem solve splicing seams, involving great expense.
Accompanying drawing explanation
Fig. 1 is the Zigzag type optical system structure schematic diagram in one embodiment of the present of invention for field stitching；
Fig. 2 is the modulation transfer function (MTF) curve synoptic diagram of Zigzag type optical system in the present invention for field stitching.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe wholely.Obviously, described embodiment is to implement the better embodiment of the present invention, and described description is that the present invention is described
Rule for the purpose of, be not limited to the scope of the present invention.Protection scope of the present invention should be with claim institute circle
The person of determining is as the criterion, and based on the embodiment in the present invention, those of ordinary skill in the art are not on the premise of making creative work
The every other embodiment obtained, broadly falls into the scope of protection of the invention.
For the defect of prior art, the invention provides a kind of Zigzag type optical system for field stitching, permissible
Realize visual field remote, big, omnibearing quick track-while-scan.Specifically, see Fig. 1, in one embodiment of the invention,
Zigzag type optical system for field stitching includes: cylindricality splicing optical window 1, plane of scanning motion reflecting mirror 2, planar annular reflecting mirror
3, concave surface principal reflection mirror 4, rhombic prism 5 and image transferring lens group 6；Wherein, the center of planar annular reflecting mirror 3 is provided with through hole, enters
The light (infra-red radiation) of cylindricality splicing optical window 1 sequentially passes through plane of scanning motion reflecting mirror 2, planar annular reflecting mirror 3 and concave surface master
The triple reflection of reflecting mirror 4 forms light of turning back, and light of turning back is by the imaging at rhombic prism 5 of this through hole, and rhombic prism 5 is to imaging
Carry out visual field segmentation and be respectively fed to image transferring lens group 6 and complete image-receptive and splicing.
Wherein, the cylindricality splicing optical window 1 in Fig. 1 is spliced by multi-disc cylindricality plane window, solves super large caliber
Optical window material expensive, is difficult to the problems such as processing.Super large caliber optical window, and integral-rotation post is obtained by the method for splicing
Shape splicing optical window 1 is to obtain infra-red radiation as much as possible from each orientation, to realize infrared acquisition field medium and long distance, Quan Fang
The technical barriers such as position search.As relevant technical staff in the field it is also to be understood that select other controllable costs and the biggest mouth
The optical window in footpath can also realize same purpose, therefore where like the splicing optical window of the shape that can select other, here
Cylindricality splicing optical window 1 is not as the restriction of the present invention.
Plane of scanning motion reflecting mirror 2 is arranged in the inside of cylindricality splicing optical window 1, is 45 degree of angles with incident infra-red radiation.Enter
Infra-red radiation scanned plane mirror 2 reflection optical axis penetrated folds 90 degree, realizes optical axis on a large scale simultaneously and slightly points to.Annular flat
Face reflecting mirror 3 is vertical with plane of scanning motion reflecting mirror 2, and the center of area line of two plane mirrors and first secondary reflection parallel light.Slightly refer to
To light (first secondary reflection light) again through the reflection of planar annular reflecting mirror 3, optical axis carries out 90 degree of foldings again.Concave surface principal reflection
The central shaft of mirror 4 is by the center of area of planar annular reflecting mirror 3 and vertical with the center of area line of two plane mirrors.Through two secondary reflections
Light again through concave surface principal reflection mirror 4 third time reflection, optical axis 180 degree of foldings again, reduce beam cross section simultaneously, make light open
Begin to assemble.Concave surface principal reflection mirror 4 is a spherical reflector, it is ensured that in image planes, the spherical aberration of any point is identical.
Further, planar annular reflecting mirror 3 be provided centrally with a through hole, the converging light after triple reflection by should
Through hole starts imaging.Rhombic prism 5 is arranged at image planes, i.e. the focal plane of concave surface principal reflection mirror, distance concave surface principal reflection
The radius of curvature that summit R/2, R are concave surface principal reflection mirror of mirror.Rhombic prism 5 carries out visual field segmentation to imaging (such as can be by light
Road is divided into the two-way of symmetry), realize the transverse shifting of optical axis simultaneously, the optical axis direction after moving does not changes.
Image transferring lens group 6 is made up of multiple lens, the imaging after the light inlet field of view of receiver segmentation of image transferring lens group 6, light-emitting window
Connect Infrared Detectors (imageing sensor) and obtain image.For realizing obtaining the image of big visual field, solve by size sensor work
The problem that skill limits, first uses rhombic prism 5 to split visual field, is divided into different positions, then uses multiple turns
Receive as mirror group 6 is respectively fed to polylith imageing sensor, then the image that polylith imageing sensor receives is spliced.
Wherein, image transferring lens group 6 farther includes aberration correction mirror group and optical beam transformation mirror group, and aberration correction mirror group is to secondary
Image space is adjusted with aberration correction, and optical beam transformation mirror group realizes pupil coupling.Can as relevant technical staff in the field
With understand, can use herein the combination of different lens to form image transferring lens group, here not as limitation of the present invention.
Correspondingly, the most complete image acquisition procedures using above-mentioned Zigzag type optical system is:
1. infra-red radiation carries out big visual field, fast search remote, omnibearing through cylindricality splicing optical window 1；
2. the reflection of the scanned plane mirror of incident IR radiation 2, it is achieved optical axis slightly points on a large scale；
3. just secondary reflection light is through stationary annular plane mirror 3 secondary reflection, and optical axis carries out 90 degree of foldings again；
4. secondary reflection light reflects and reduces beam cross section through concave surface principal reflection mirror 4, the folding of 180 degree of optical axis, with after through ring
The through hole imaging that shape plane mirror 3 is centrally disposed, arrives and is arranged at the rhombic prism at image planes 5；
5. at image planes, carry out visual field segmentation with rhombic prism 5, realize the transverse shifting of optical axis simultaneously, after moving
Optical axis direction does not changes；
6. image transferring lens group 6 carries out aberration correction pupil coupling, arrives detector focal plane.
For realizing obtaining the image of big visual field, the problem solving to be limited by size sensor technique, first use rhombus rib
Visual field is split by mirror 5, is divided into different positions, then uses polylith sensor to receive, then is received by imageing sensor
To image splice.
Fig. 2 is the optical-modulation transfer function curve chart of optical system embodiment of the present invention.Modulation transfer function (MTF) represents tune
Relation between every millimeter of demand pairs in system and image, is the most comprehensive criterion during all Performance of Optical System judge, especially
It is for imaging system.In infrared optical system, typically require system modulation transmission letter at Nyquist space frequency
Numerical value >=0.3 or 0.4, as a example by Infrared Detectors picture dot size 25um, then the maximum spatial frequency that system can be differentiated is:
20lp/mm.It can be seen that at spatial frequency 20lp/mm, system modulating transfer function value in the range of full filed
More than 0.45, show that optical system imaging quality is good, meet the utilization standard of optical instrument, i.e. this design of Optical System and close
Reason, can use in practice.
The present invention has supplied a kind of Zigzag type optical system for field stitching, in order to solve big visual field, remote, Quan Fang
The problem that the fast search of position, the compactedness of system are taken into account, meets system first by cylindricality splicing optical window and carries out remote, complete
The search in orientation, and solve the difficulty that super large caliber optics optical window is difficult to process, secondly, concave surface principal reflection mirror and planar annular
Reflecting mirror overlaps, it is ensured that image planes carry out the condition of optical segmentation, and rhombic prism segmentation visual field realizes the horizontal stroke of optical axis simultaneously again
To movement, mobile after optical axis direction do not change, it is to avoid the light path after segmentation rotates and the interference of stationary mirror asks
Topic, can be widely applied to infrared early warning platform.
Although above in association with preferred embodiment, invention has been described, but it should be appreciated by those skilled in the art,
Method and system of the present invention is not limited to the embodiment described in detailed description of the invention, is wanting without departing substantially from by appended right
In the case of seeking the spirit and scope of the invention that book limits, can to the present invention various modification can be adapted, increase and replace.
Claims (10)
1. the Zigzag type optical system for field stitching, it is characterised in that described optical system includes:
Cylindricality splicing optical window, plane of scanning motion reflecting mirror, planar annular reflecting mirror, concave surface principal reflection mirror, rhombic prism and image transferring lens
Group；Wherein,
The center of described planar annular reflecting mirror is provided with through hole, enter described cylindricality splicing optical window light sequentially pass through described in sweep
The triple reflection retouching plane mirror, described planar annular reflecting mirror and described concave surface principal reflection mirror forms light of turning back, described folding
Returning light by the imaging at described rhombic prism of described through hole, described rhombic prism carries out visual field segmentation and sends into described imaging
Image transferring lens group carries out image-receptive.
Optical system the most according to claim 1, it is characterised in that in described optical system:
Described plane of scanning motion reflecting mirror is arranged in the inside of described cylindricality splicing optical window, with the light entering described cylindricality splicing optical window
Line is 45 degree of angles；
Described planar annular reflecting mirror is vertical with described plane of scanning motion reflecting mirror, and the center of area line of two plane mirrors is with first
Reflection parallel light；
The central shaft of described concave surface principal reflection mirror by the center of area of described planar annular reflecting mirror and with the face of two plane mirrors
Heart line is vertical.
Optical system the most according to claim 1, it is characterised in that in described system:
Imaging after the light inlet field of view of receiver segmentation of described image transferring lens group, light-emitting window connects Infrared Detectors.
4. according to the optical system described in claim 1 or 3, it is characterised in that in described system:
Described image transferring lens group has multiple.
Optical system the most according to claim 4, it is characterised in that the number of described image transferring lens group and described rhombic prism
The visual field segmentation number realized is identical.
Optical system the most according to claim 5, it is characterised in that multiple described image transferring lens groups receive described visual field respectively
Each imaging after segmentation carries out image mosaic again.
Optical system the most according to claim 1, it is characterised in that described image transferring lens group includes aberration correction mirror group and light
Bundle transformation glass group.
Optical system the most according to claim 1, it is characterised in that described image transferring lens group is made up of multiple lens.
Optical system the most according to claim 1, it is characterised in that described concave surface principal reflection mirror is a spherical reflector.
Optical system the most according to claim 1, it is characterised in that described rhombic prism is arranged at image planes.
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| CN201610688757.3A CN106125280B (en) | 2016-08-19 | 2016-08-19 | Zigzag type optical system for field stitching |
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| CN201610688757.3A CN106125280B (en) | 2016-08-19 | 2016-08-19 | Zigzag type optical system for field stitching |
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Cited By (4)
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| CN106526821A (en) * | 2016-11-30 | 2017-03-22 | 长光卫星技术有限公司 | Dual-mode space remote-sensing camera based on field-of-view light-splitting optical system |
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| CN108345095A (en) * | 2018-03-30 | 2018-07-31 | 中国科学院西安光学精密机械研究所 | A kind of low veiling glare round-the-clock star tracker optical texture of wide cut |
| CN112946907A (en) * | 2021-01-29 | 2021-06-11 | 中国科学院长春光学精密机械与物理研究所 | Large-view-field visible-infrared integrated compact optical camera |
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