CN101770158A - Double-view-field three-dimensional imaging optical system based on integrated shared primary mirror - Google Patents
Double-view-field three-dimensional imaging optical system based on integrated shared primary mirror Download PDFInfo
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- CN101770158A CN101770158A CN200910243273A CN200910243273A CN101770158A CN 101770158 A CN101770158 A CN 101770158A CN 200910243273 A CN200910243273 A CN 200910243273A CN 200910243273 A CN200910243273 A CN 200910243273A CN 101770158 A CN101770158 A CN 101770158A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 46
- 238000003384 imaging method Methods 0.000 title claims abstract description 11
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- 238000012937 correction Methods 0.000 abstract description 2
- 230000010354 integration Effects 0.000 abstract 1
- 238000013507 mapping Methods 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
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- 239000000463 material Substances 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
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- 239000003795 chemical substances by application Substances 0.000 description 1
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Abstract
The double-view-field stereoscopic imaging optical system based on the integrated shared primary mirror comprises two three-reflection off-axis optical systems, and comprises a welding primary mirror, two secondary mirrors, two three mirrors, two plane turning mirrors and two receiving surfaces. The system of the invention welds the primary mirrors of the two optical systems at a certain angle to realize the integration of the optical systems, thereby not only ensuring the stability of the included angle of the front and rear view fields and ensuring the stability of the base height ratio (B/H), but also changing the welding angle and flexibly realizing the required base height ratio (B/H). The system has smaller weight and volume and higher thermal stability, thereby obtaining high stability of the internal orientation elements and realizing high-precision correction of the image.
Description
Technical field
The invention belongs to the space flight optical remote sensor technical field, relate to a kind of double-view field optical system for stereo mapping.
Background technology
Because the space flight optical remote sensor technology rapid development, improve constantly for the requirement of remote sensor system applies level.
Cartographic satellite is to be platform with satellite, airship or space station, carry the imaging remote sensor that satisfies the stereoscopic photograph requirement, earth surface is photographed, obtain image information, through Photogrammetric Processing, accurately measure the landforms of earth surface, shape, size and the locus of atural object (target), generate the required various topographic support products of Ground Application.
From the domestic and international research present situation, existing space flight conventional dedicated mapping camera, many employings two, three cover cameras carry out stereo mapping, being about to have two of different visual fields or three cameras is installed in respectively on the optical substrate, the realization stereo mapping (as, the ALOS/Prism of Japan), so not only caused the satellite bulking value excessive, structural stability between each camera and precision etc. are difficult to guarantee simultaneously, each separate optical system is being subjected to the thermal force effect, the variation of optical axis and the different variations of elements of interior orientation be can produce when deforming, image quality and mapping precision finally influenced.Therefore, the stereo mapping system of this employing discrete mechanical-optical setup will face increasing difficulty in further developing.
In order to overcome above-mentioned deficiency, just need the remote sensor optical system of the little and high stability of the novel bulking value of development, be used for big base-height ratio whole world stereo mapping, and the mapping demand that will improve constantly satisfied future.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, provide that a kind of volume is little, in light weight, the double-view field three-dimensional imaging optical system based on integrated shared primary mirror of good stability.
Technical solution of the present invention is: based on the double-view field three-dimensional imaging optical system of integrated shared primary mirror, it is characterized in that comprising: a welding primary mirror, two secondary mirrors, two three mirrors, turn back mirror and two of two planes receive image planes, the welding primary mirror is welded into "〉by two minute surfaces " the type structure, the welding primary mirror, second secondary mirror, second three mirror, second plane mirror of turning back, second receives image planes constitutes preceding viewing system, the welding primary mirror, first secondary mirror, first three mirror, first plane mirror of turning back, first receives image planes constitutes back-sight visual system, be placed with first plane mirror of turning back from top to bottom successively in the left side, first secondary mirror, second secondary mirror and second plane mirror of turning back, be placed with first three mirror from top to bottom successively on the right side, second receives image planes, the welding primary mirror, first receives image planes and second three mirror, the central shaft of first secondary mirror is the primary optical axis of backsight optical system, and the central shaft of second secondary mirror is the primary optical axis of forward sight optical system; Turning back and be the light entrance of preceding viewing system between mirror and first secondary mirror in first plane, turns back and be the light entrance of back-sight visual system between the mirror in second secondary mirror and second plane; Field rays arrives second successively and receives image planes before the camera after mirror reflection is turned back on primary mirror, second secondary mirror, second three mirror and second plane; Field rays arrives first and receives image planes behind the camera after mirror reflection is turned back on welding primary mirror, first secondary mirror, first three mirror and first plane.
Described two "〉that minute surface is welded into " angle of type structure determines according to the desired base-height ratio of optical system.
The face shape of described welding primary mirror, two secondary mirrors, two three mirrors is an aspheric surface.
The present invention's advantage compared with prior art is:
(1) the present invention has been owing to adopted by the welding primary mirror and realized that two three anti-off-axis optical systems are integrated, and the double-view field symmetry, therefore just avoids or reduced the influence that heat/force-disturbance cooperates multisystem on the stereo mapping clock star greatly; Also avoided the three-dimensional composograph quality of differentia influence, reduced the bang path of camera front and back viewing system error chains simultaneously, improved the ground bearing accuracy of image effectively because of the heat control system of different loads;
(2) system of the present invention is because shared primary mirror, the primary mirror of two optical systems is welded with certain angle, the realization optical system is integrated, before not only having guaranteed, the stability of backsight visual field angle, thereby guaranteed the stable of base-height ratio (B/H), and can change soldering angle, realize required base-height ratio (B/H) flexibly, make the volume of camera significantly reduce, formation that simultaneously can simplified system, the weight of mitigation system makes the good rigidity of system, and structural stability is good, the intersection angle of visual field, front and back is implemented in rail easily and detects, shortcomings such as the agent structure volume weight that has overcome conventional dedicated mapping camera discrete mechanical-optical setup is big, and structure between the discrete camera and elements of interior orientation stability are difficult to assurance, and mapping precision is low.
Description of drawings
Fig. 1 is the structure principle chart of system of the present invention.
Embodiment
As shown in Figure 1, the structure principle chart of system of the present invention.System comprises a welding primary mirror 1, two secondary mirrors 2,6, two three mirrors 3,8, two planes mirror 4,7 of turning back, and two reception image planes 5,9, welding primary mirror 1 is welded into "〉by two minute surfaces " the type structure, welding primary mirror 1, second secondary mirror 6, second three mirror 8, second plane turn back mirror 7, second receive image planes 5 and constitute before viewing system, welding primary mirror 1, first secondary mirror 2, first three mirror 3, first plane mirror 4, first of turning back receives image planes 9 and constitutes back-sight visual systems.The central shaft of first secondary mirror 2 is primary optical axis of backsight optical system, and the central shaft of second secondary mirror 6 is primary optical axis of forward sight optical system.
Be placed with first plane mirror 4, first secondary mirror 2, second secondary mirror 6 and second plane mirror 7 of turning back of turning back in the left side from top to bottom successively, be placed with successively from top to bottom on the right side that first three mirror 3, second receives image planes 5, welding primary mirror 1, first receives image planes 9 and second three mirror 8.Turning back and be the light entrance of preceding viewing system between mirror 4 and first secondary mirror 2 in first plane, turns back and be the light entrance of back-sight visual system between the mirror 7 in second secondary mirror 6 and second plane.The field rays mirror 7 reflection backs of turning back through primary mirror 1, second secondary mirror 6, second three mirror 8 and second plane successively arrive the second reception image planes 5 before the camera; Field rays arrives first and receives image planes 9 behind the camera after mirror 4 reflections are turned back on welding primary mirror 1, first secondary mirror 2, first three mirror 3 and first plane.
By welding primary mirror 1, before symmetry, the backsight optical system light path is under the prerequisite that is independent of each other, by inside separately, the primary mirror that makes the backsight optical system is between the primary mirror and three mirrors of preceding viewing system, the forward sight System planes mirror of turning back is turned back between mirror and three mirrors on the plane of back-sight visual system, take clearance spaces separately mutually, making originally, two cover mapping cameras are integrated into one, not only reduced the material volume of camera effectively, the load weight of satellite platform, and the high structural stability of realization tridimensional mapping camera, and provide camera accurate measuring basis.
Two receive image planes 5,9 and receive the light that converges from former and later two visual fields simultaneously, and imaging on image planes separately respectively is used for obtaining stereogram, and the ground relevant matches and the geospatial information that are used for image are handled.
Two "〉that minute surface is welded into " angle of type structure determines according to the desired base-height ratio of optical system.The angle theta of base-height ratio of optical system (B/H) and preceding viewing system and back-sight visual system light satisfies relational expression:
The angle of viewing system and back-sight visual system light before can obtaining according to the base-height ratio of setting designs the angle of welding primary mirror 1 in the optical system according to this, and viewing system and back-sight visual system light can get final product on reception image planes separately in imaging before making.
The face shape of 2,6, two three mirrors 3,8 of welding 1, two secondary mirror of primary mirror is an aspheric surface, and purpose is to be used for aberration correction, makes picture element can reach diffraction limit.
During application, at first need to design suitable optical system, not only will satisfy the required picture element requirements such as low distortion of mapping, and need satisfy the restriction of remote-sensing flatform physical dimension.Use the integrated software of ray machine to carry out the splicing of forward and backward optometry system then, guaranteeing has enough spaces between each optical system primary and secondary three mirror, makes mutually noninterfere, blocks.
Carry out the primary mirror welding and the time should be noted that two prerequisites: (1) two primary mirror scantling is bigger, reaches the purpose of partial common by welding, can reduce overall dimensions (primary mirror, optical system) simultaneously; The angle of (2) two primary mirrors less (less than 180 °), close together causes being difficult to processing on same block of material, thereby the split processing of having to, welding fabrication.
The technology point of welding: (1) uses frock, guarantees by the accuracy of form and position between weldering two bodies; (2) need after the welding to adopt I.B.M. to repair type, to guarantee two optical axis relative error amounts between the face type; (3) processing of welding system is repaiied type and will be determined to repair type amount and distribution by detecting with the interference of secondary mirror and compensating glass.
The primary mirror of two optical systems is welded with certain angle (serving as to realize required base-height ratio), the realization optical system is integrated, has not only guaranteed the stability of forward and backward visual field angle, thereby has guaranteed the stable of base-height ratio, and can change soldering angle, realize required base-height ratio flexibly.
The content that is not described in detail in the instructions of the present invention belongs to those skilled in the art's known technology.
Claims (3)
1. based on the double-view field three-dimensional imaging optical system of integrated shared primary mirror, it is characterized in that comprising: a welding primary mirror (1), two secondary mirrors (2,6), two three mirrors (3,8), two planes mirror (4 of turning back, 7) and two receive image planes (5,9), welding primary mirror (1) is welded into "〉by two minute surfaces " the type structure, welding primary mirror (1), second secondary mirror (6), second three mirror (8), second plane mirror (7) of turning back, second receives image planes (5) constitutes preceding viewing system, welding primary mirror (1), first secondary mirror (2), first three mirror (3), first plane mirror (4) of turning back, first receives image planes (9) constitutes back-sight visual system, be placed with first plane mirror (4) of turning back from top to bottom successively in the left side, first secondary mirror (2), second secondary mirror (6) and second plane mirror (7) of turning back, be placed with first three mirror (3) from top to bottom successively on the right side, second receives image planes (5), welding primary mirror (1), first receives image planes (9) and second three mirror (8), the central shaft of first secondary mirror (2) is the primary optical axis of backsight optical system, and the central shaft of second secondary mirror (6) is the primary optical axis of forward sight optical system; Turning back and be the light entrance of preceding viewing system between mirror (4) and first secondary mirror (2) in first plane, turns back and be the light entrance of back-sight visual system between the mirror (7) in second secondary mirror (6) and second plane; Field rays arrives second successively and receives image planes (5) before the camera after mirror (7) reflection is turned back on primary mirror (1), second secondary mirror (6), second three mirror (8) and second plane; Field rays arrives first and receives image planes (9) behind the camera after mirror (4) reflection is turned back on welding primary mirror (1), first secondary mirror (2), first three mirror (3) and first plane.
2. the double-view field three-dimensional imaging optical system based on integrated shared primary mirror according to claim 1 is characterized in that: described two "〉that minute surface is welded into " angle of type structure determines according to the desired base-height ratio of optical system.
3. the double-view field three-dimensional imaging optical system based on integrated shared primary mirror according to claim 1 is characterized in that: the face shape of described welding primary mirror (1), two secondary mirrors (2,6), two three mirrors (3,8) is an aspheric surface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102432738A CN101770158B (en) | 2009-12-30 | 2009-12-30 | Double-field-of-view stereoimaging optical system based on integrated shared primary mirror |
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| CN2009102432738A CN101770158B (en) | 2009-12-30 | 2009-12-30 | Double-field-of-view stereoimaging optical system based on integrated shared primary mirror |
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| CN101770158B CN101770158B (en) | 2011-03-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111093015A (en) * | 2019-12-09 | 2020-05-01 | 中国空间技术研究院 | High-resolution monitoring imaging satellite system and method for stationary orbit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1140828C (en) * | 2001-11-07 | 2004-03-03 | 中国科学院上海技术物理研究所 | Astigmatism-eliminating three-reflector optical system |
| CN1173204C (en) * | 2003-02-28 | 2004-10-27 | 清华大学 | Astigmatism eliminating three spherical reflector system |
| CN101303449B (en) * | 2008-07-10 | 2010-06-02 | 北京空间机电研究所 | Double-visual field off-axis three-mirror integrated type optical system for sharing primary and secondary lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111093015A (en) * | 2019-12-09 | 2020-05-01 | 中国空间技术研究院 | High-resolution monitoring imaging satellite system and method for stationary orbit |
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