CN103777350A - Coaxial three-mirror zooming optical system based on photoisomerization materials - Google Patents
Coaxial three-mirror zooming optical system based on photoisomerization materials Download PDFInfo
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- CN103777350A CN103777350A CN201410048580.1A CN201410048580A CN103777350A CN 103777350 A CN103777350 A CN 103777350A CN 201410048580 A CN201410048580 A CN 201410048580A CN 103777350 A CN103777350 A CN 103777350A
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Abstract
Provided is a coaxial three-mirror zooming optical system based on photoisomerization materials. The coaxial three-mirror zooming optical system based on the photoisomerization materials comprises a primary mirror, a secondary mirror, a tertiary mirror and a caliber-variable diaphragm, wherein the caliber-variable diaphragm is located at a system exit pupil position in a short focal length mode, a system aperture diaphragm is arranged on the primary mirror, a classic R-C optical system is formed by the primary mirror and the secondary mirror, radiation light beams of a target scenery are converged by the primary mirror and the secondary mirror to form a middle real image, and the middle real image is imaged on the focal plane of the optical system through the tertiary mirror. According to the coaxial three-mirror zooming optical system based on the photoisomerization materials, the primary mirror, the secondary mirror and the tertiary mirror are made of the photoisomerization materials, changes of coefficients of aspheric surfaces of the mirrors are controlled through the material characteristics of the coaxial three-mirror zooming optical system in the zooming process of the coaxial three-mirror zooming optical system, and finally the coaxial three-mirror zooming optical system can have both the advantages of being large in focal length and high in resolution, and the advantages of being short in focal length and wide in field of view only through the changes of the coefficients of the aspheric surfaces of the mirrors and slight adjustment of the mirror spacing under the condition that the radii of curvature of all the mirrors of the optical system are unchanged.
Description
Technical field
The invention belongs to space flight optical remote sensor technical field, relate to a kind of coaxial three anti-variable focal length optical systems based on photic isomery material.
Background technology
Along with the development of space optical remote technology, for the also increasingly stringent of functional requirement of investigation camera.In environment mitigation and military surveillance field, both wished that camera can complete the generaI investigation of ground object target on a large scale, needed again it to carry out detailed survey to specific region simultaneously especially.What emphasize is the fabric width covering power of camera in generaI investigation, mainly carry out in a big way in, low resolution imaging, complete observation and search to global object; What detailed survey was emphasized is the detailed information acquisition capability of camera, mainly important area is carried out to high-resolution imaging, obtains the details of interesting target.The specific demand of this generaI investigation and detailed survey requires investigation camera optics system to have the function of generaI investigation and detailed survey concurrently, and the integrated space camera of this detailed generaI investigation will become a very important developing direction of future space earth observation optical system undoubtedly.
The integrated method of generaI investigation in detail that realizes both at home and abroad at present mainly contains two kinds: the first relies on multi-satellite flexible combination or single the motor-driven change rail of satellite to realize high low resolution exactly, and the ground of width visual field covers; The second is the optics load of carrying separate unit or many and have different resolution and visual field on satellite platform, completes respectively generaI investigation and detailed survey imaging.The KH-9 of the U.S. has just represented the trend of U.S.'s optical reconnaissance satellite to comprehensive reconnaissance satellite development, it can be generally investigated, again can detailed survey, highest resolution can reach 0.3 meter, and the transmitting Ze Shi U.S. of KH-11 has obtained satellite real time reconnaissance ability, when generaI investigation, resolution reaches 1～3 meter, and when detailed survey, resolution reaches 0.15 meter.In addition, for detailed generaI investigation is integrated, when generaI investigation, require the short focal length of camera, low resolution imaging in large visual field; When detailed survey, require camera long-focus, small field of view high-resolution imaging.Variable focal length optical system can meet such requirement just, can realize one camera space and generally investigate in detail integrated function.So far, the most ripe external varifocal optical system is transmission-type zoom system, pancreatic system, but it is difficult to meet the development trend of long-focus wide spectrum space optical remote sensor, and therefore total-reflection type zoom system, pancreatic system starts to be subject to increasing attention.
Coaxial three reflecting optical systems because its Project Realization is good, be easy to realize high precision temperature control, the advantage such as elements of interior orientation degree of stability is high, compact conformation, be considered to the first-selected pattern of space optical remote sensor type selecting.Existing reflective variable focal length optical system mainly contains and utilizes cam carry out the mechanical type Zooming method that nonlinear mirror spacing moves and utilize deformable mirror to carry out the active optics formula Zooming method of each face curvature variation.For coaxial three reflecting optical systems of long-focus, because system architecture simply only has, two mirror spacing are very difficult only relies on mirror spacing nonlinear moving to meet the requirement of length focal length mode picture element simultaneously, and therefore mechanical type zoom scheme is not very suitable for the coaxial reflect system of long-focus.Simultaneously for coaxial three reflecting optical systems of large-aperture long-focus, change and realize system zoom by face type curvature if want, this just means that each type variable quantity may be very large, and structural design is difficult to its high stability using in-orbit of assurance, and this greatly reduces the engineering feasibility of system.Can find that existing zoom mode all cannot meet the demand of the coaxial three anti-Space Optical System of following long-focus heavy caliber.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, a kind of coaxial three anti-variable focal length optical systems based on photic isomery material are provided, can realize simultaneously high resolving power among a small circle detailed survey and on a large scale in low resolution generaI investigation function, and guarantee that two-mode image quality is good, system stability is high, compact conformation simultaneously.
Technical solution of the present invention is: a kind of coaxial three anti-variable focal length optical systems based on photic isomery material, comprise primary mirror, secondary mirror, three mirrors, drive motor, focal plane detector and afocal variable diaphragm; Primary mirror, secondary mirror, three mirrors and afocal variable diaphragm are coaxially placed; Incident beam is successively through after the reflection of primary mirror, secondary mirror, and the light hole seeing through on primary mirror arrives three mirrors, then after afocal variable diaphragm in the imaging of focal plane detector place; Described primary mirror, secondary mirror, three mirror materials all adopt photic isomery material; In the case of the radius-of-curvature of primary mirror, secondary mirror, three mirrors remains unchanged, change the asphericity coefficient of primary mirror, secondary mirror, three mirrors by photic isomery material behavior, and utilize drive motor to drive three mirrors to move horizontally along optical axis direction, complete the zoom of whole optical system.
Described primary mirror, secondary mirror, three mirrors are non-spherical reflector; Wherein primary mirror type is parabola, and secondary mirror and three mirror type are high order aspheric surface.
Described focal plane receiving device is line array CCD or TDICCD detector.
The present invention's advantage is compared with the prior art:
(1) the present invention is owing to adopting the burnt scheme of coaxial three contravariant, can only complete generaI investigation and among a small circle high resolving power detailed survey function on a large scale by a camera simultaneously, greatly reduce like this and realize generaI investigation in detail in conjunction with the complicacy of observation, in saving ample resources for satellite platform, greatly reduce its launch cost.The present invention is suitable as the optical system of following high-performance investigation camera very much.
(2) the present invention because each catoptron all adopts photic isomery material, in the situation that each type radius-of-curvature is completely constant only by changing asphericity coefficient and a small amount of mirror spacing completion system zoom.The present invention, applicable to large-aperture long-focus optical system, can guarantee that each large caliber reflecting mirror face type variable quantity is less compared with existing zoom mode, possesses engineering realizability, and the range of adjustment that has simultaneously reduced mirror spacing makes system structure design relatively simple.The present invention more meets the development trend of space optical remote sensor large-aperture long-focus, and its Project Realization is better simultaneously, system reliability is higher.
(3) in the present invention owing to having adopted three coaxial non-spherical reflectors, mechanical-optical setup compactness, make the structural stability of system higher, moment of inertia is less, be easy to realize high-precision temperature and point to and control, one-piece construction is compacter, very favourable for spaceborne long-focus high resolving power investigation camera.
(4) in the present invention owing to there being intermediary image, field stop and interior light shield can be set in intermediary image position, thereby effectively eliminate veiling glare outside visual field, reduce the requirement of external light shield length.
Accompanying drawing explanation
Structural drawing when Fig. 1 is optical system long-focus pattern of the present invention;
Structural drawing when Fig. 2 is the short focal length mode of optical system of the present invention;
MTF curve map when coaxial three anti-variable focal length optical system long-focus pattern based on photic isomery material in Fig. 3 example of the present invention;
MTF curve map when the short focal length mode of coaxial three anti-variable focal length optical system based on photic isomery material in Fig. 4 example of the present invention.
Embodiment
Embodiment of the present invention work spectral coverage is 0.45～0.8 μ m, entrance pupil bore 1000mm when long-focus pattern, optical system focal length 12m, 0.4 ° of full visual field, system overall length 1900.02mm.Entrance pupil bore 500mm when short focal length mode, optical system focal length 4m, 3 ° of full visual fields, system overall length 1631.96mm.When long burnt pattern, as shown in Figure 1, optical system of the present invention comprises embodiment: primary mirror 1, secondary mirror 2, three mirrors 3, drive motor 4, focal plane detector 5 and afocal variable diaphragm 6.Primary mirror 1, secondary mirror 2, three mirrors 3 and afocal variable diaphragm 6 are coaxial, and primary mirror 1, secondary mirror 2 form classical R-C system, and form real image one time, and one time real image is imaged onto focal plane detector 5 through three mirrors 3 and afocal variable diaphragm 6.Wherein an image position is between 1 mirror and 3 mirrors, apart from 1 mirror 495.38mm position.Focal plane detector 5 is line array CCD or TDICCD detector receiving plane.Primary mirror 1 is as the criterion parabola (quadratic term coefficient-0.9853), secondary mirror 2 for high order aspheric surface (quadratic term coefficient 2.958,4 rank asphericity coefficients are 4.09E-9,6 rank asphericity coefficients are 2.329E-14,8 rank asphericity coefficients are 2.52E-19,10 rank asphericity coefficients are 1.70E-24), three mirror 3(quadratic term coefficient-7.98,4 rank asphericity coefficients are-3.578E-9,6 rank asphericity coefficients are 2.377E-14,8 rank asphericity coefficients are 9.49E-19,10 rank asphericity coefficients are-1.02E-24), material is photic isomery material.When short burnt pattern, as shown in Figure 2, now primary mirror 1 is moved with secondary mirror 2 spacing, secondary mirror 2 and three mirror 3 spacing embodiment, and primary mirror 1, secondary mirror 2, three mirror 3 asphericity coefficients change simultaneously.Now primary mirror 1 quadratic term coefficient becomes-0.93, secondary mirror 2 quadratic term coefficients become that-5.358,4 become-3.18E-9 of rank asphericity coefficient, 6 rank asphericity coefficients become 6.43E-14,8 become-8.97E-18 of rank asphericity coefficient, 10 rank asphericity coefficients become 8.158E-22, three mirror 3 quadratic term coefficients become-5.978,4 become-2.64E-9 of rank asphericity coefficient, 6 rank asphericity coefficients become 1.37E-14,8 become-7.46E-19 of rank asphericity coefficient, 10 rank asphericity coefficients become 2.195E-25.In addition, pass through the actual clear aperture of afocal variable diaphragm 6 control system at system exit pupil position place when short burnt pattern, now afocal variable diaphragm 6, between primary mirror 1 and three mirrors 3, is 331.07mm apart from the distance of primary mirror 1.
Face type and spacing variable quantity because bore is larger, under the longer identical zoom ratio condition of focal length when zoom also will become large thereupon, its face type difficulty of processing is also just larger, therefore this programme adopts photic isomery material on the constant basis of each face curvature radius, to adjust asphericity coefficient and a small amount of mirror spacing, greatly reduce like this variable quantity and the mirror spacing Nonlinear Adjustment amount of face type, thereby greatly improved the engineering realizability of system.Actual result has realized freely switching from 12m focal length, 0.4 ° of visual field optical system and 4m focal length, 3 ° of visual field optical systems, and under each pattern, picture element is good, under its long-focus pattern, MTF curve as shown in Figure 3, can find out, MTF curve approaches diffraction limit in the time of every millimeter of 50 pairs of line, under its short focal length mode, MTF curve as shown in Figure 4, can be found out, MTF curve is greater than 0.7 in the time of every millimeter of 25 pairs of line.
The content not being described in detail in instructions of the present invention belongs to those skilled in the art's known technology.
Claims (3)
1. the coaxial three anti-variable focal length optical systems based on photic isomery material, is characterized in that: comprise primary mirror (1), secondary mirror (2), three mirrors (3), drive motor (4), focal plane detector (5) and afocal variable diaphragm (6); Primary mirror (1), secondary mirror (2), three mirrors (3) and afocal variable diaphragm (6) are coaxially placed; After incident beam passes through primary mirror (1), secondary mirror (2) reflection successively, the light hole seeing through on primary mirror (1) arrives three mirrors (3), then locates imaging at focal plane detector (5) after afocal variable diaphragm (6); Described primary mirror (1), secondary mirror (2), three mirrors (3) material all adopt photic isomery material; In the case of the radius-of-curvature of primary mirror (1), secondary mirror (2), three mirrors (3) remains unchanged, change the asphericity coefficient of primary mirror (1), secondary mirror (2), three mirrors (3) by photic isomery material behavior, and utilize drive motor (4) to drive three mirrors (3) to move horizontally along optical axis direction, complete the zoom of whole optical system.
2. a kind of coaxial three anti-variable focal length optical systems based on photic isomery material according to claim 1, is characterized in that: described primary mirror (1), secondary mirror (2), three mirrors (3) are non-spherical reflector; Wherein primary mirror (1) face type is parabola, and secondary mirror (2) and three mirrors (3) face type are high order aspheric surface.
3. a kind of coaxial three anti-variable focal length optical systems based on photic isomery material according to claim 1, is characterized in that: described focal plane receiving device (5) is line array CCD or TDICCD detector.
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Cited By (6)
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|---|---|---|---|---|
| CN104735321A (en) * | 2015-03-25 | 2015-06-24 | 北京空间机电研究所 | Optical bidirectional scanning system of space TDICCD remote sensor |
| CN106644412A (en) * | 2016-12-30 | 2017-05-10 | 上海镭昊光电股份有限公司 | Multispectral reflection type collimator |
| CN108919479A (en) * | 2018-06-22 | 2018-11-30 | 深圳市润沃自动化工程有限公司 | laser reflection imaging device |
| CN110764241A (en) * | 2019-11-29 | 2020-02-07 | 中国科学院长春光学精密机械与物理研究所 | Multi-focus distance axis three-reflection imaging optical system |
| 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 |
| WO2021057641A1 (en) * | 2019-09-27 | 2021-04-01 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Reflective camera and electronic device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104735321A (en) * | 2015-03-25 | 2015-06-24 | 北京空间机电研究所 | Optical bidirectional scanning system of space TDICCD remote sensor |
| 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 |
| CN106644412A (en) * | 2016-12-30 | 2017-05-10 | 上海镭昊光电股份有限公司 | Multispectral reflection type collimator |
| CN108919479A (en) * | 2018-06-22 | 2018-11-30 | 深圳市润沃自动化工程有限公司 | laser reflection imaging device |
| CN108919479B (en) * | 2018-06-22 | 2024-06-04 | 深圳市润沃自动化工程有限公司 | Laser reflection imaging device |
| WO2021057641A1 (en) * | 2019-09-27 | 2021-04-01 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Reflective camera and electronic device |
| US11280984B2 (en) | 2019-09-27 | 2022-03-22 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Reflective camera and electronic device |
| CN110764241A (en) * | 2019-11-29 | 2020-02-07 | 中国科学院长春光学精密机械与物理研究所 | Multi-focus distance axis three-reflection imaging optical system |
| 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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