CN103760668A - Large-diameter long-focus continuous scanning imaging optical system - Google Patents
Large-diameter long-focus continuous scanning imaging optical system Download PDFInfo
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- CN103760668A CN103760668A CN201410059422.6A CN201410059422A CN103760668A CN 103760668 A CN103760668 A CN 103760668A CN 201410059422 A CN201410059422 A CN 201410059422A CN 103760668 A CN103760668 A CN 103760668A
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Abstract
The invention discloses a large-diameter long-focus continuous scanning imaging optical system, and belongs to the technical field of remote sensing optical system design and image quality analysis. The large-diameter long-focus continuous scanning imaging optical system comprises a scanning mirror (1), a primary mirror (2), a secondary mirror (3), a first plane mirror (4), a tertiary mirror (5), a second plane mirror (6) and an image surface (7), wherein visible light radiated by the ground is collected by the scanning mirror (1) and is reflected to the surface of the primary mirror (2), the light is converged by the primary mirror (2) to the surface of the secondary mirror (3), the light is slightly diverged by the secondary mirror (3), and then is projected to the surface of the first plane mirror (4), a light path is rotated by the first plane mirror (4) by 90 degrees, then the light is projected to the surface of the tertiary mirror (5), the light is converged by the tertiary mirror (5) to the surface of the second plane mirror (6), and the light is reflected by the secondary plane mirror (6) to the image surface (7) so that a CCD can receive the light. According to the large-diameter long-focus continuous scanning imaging optical system, the function of wide-range high-resolution imaging can be achieved on the geostationary orbit.
Description
Technical field
The invention belongs to remote sensing Optical System Design and image quality analysis technical field, relate to a kind of large-aperture long-focus continuous sweep imaging optical system.
Background technology
In order to realize high resolving power, the remote sensing system of working on geostationary orbit is equipped heavy-caliber optical system conventionally.Remote sensing optical system on geostationary orbit is relative with ground observation point static, so the range of observation of optical system also maintains static.And the visual field of the optical system of 2m bore is very little, so range of observation is also very little.
Scanning imaging technology can make the high-definition remote sensing photosystem on geostationary orbit obtain larger observation scope.When swinging, scanning mirror can make ground optical system obtain larger observation scope.But because the volume of scanning mirror is large, moment of inertia is also very large, the rotary state ability that can only remain a constant speed steady operation, but when scanning mirror rotates, picture point is moving always, so, within the CCD time shutter, there will be picture point aliasing.Therefore, the modulation transfer function of scanned imagery optical system is by variation.The rational sweep velocity of how to confirm is to guarantee that large-aperture long-focus continuous sweep imaging optical system obtains the key problem of good image quality.
Summary of the invention
The object of this invention is to provide the long burnt machine continuous sweep imaging optical system of a kind of heavy caliber, this system can realize large-scale high-resolution imaging function on geostationary orbit.
The object of the invention is to be achieved through the following technical solutions:
A kind of large-aperture long-focus continuous sweep imaging optical system, comprises following part: scanning mirror, primary mirror, secondary mirror, the first plane mirror, three mirrors, the second plane mirror and image planes, the visible ray process of terrestrial radiation is 45 with optical axis included angle
oscanning mirror collect and reflex to primary mirror surface, primary mirror by convergence of rays to secondary mirror surface, secondary mirror projects the first planar mirror surface after light is slightly dispersed, the first plane mirror and optical axis included angle are 45
o, light path can be rotated to 90
oafter project three mirror surfaces, three mirrors by convergence of rays to optical axis included angle be 10
othe second mirror surface, the second catoptron to image planes, receives optical reflection for CCD device.
Scanning mirror with optical axis included angle 45
ostatic position be benchmark reciprocating rotation, can realize ground continuous sweep imaging.The maximum rotation scope of scanning mirror is no more than ± and 10
o, variable angle scope scanning mirror and optical axis is 35
o~ 55
obetween.
The bore of optical system is 2m, and focal length is 20m, and static visual field is 1.4
o× 0.1
o, service band is visible ray or infrared band, can realize the ground observation scope of 880km × 63km.
Scanning mirror is the rectangular planes catoptron of long 2.85m, wide 2m.The rotating shaft of scanning mirror is perpendicular to paper and through center O point.Scanning mirror one dimension uniform rotation around the shaft realizes scanning.Adopt dynamic optical transfer function analysis method to draw, at time shutter scope 0.5 ~ 1.5ms, the anglec of rotation of scanning mirror should be less than 7 × 10
-6o, guarantee mtf value declines and is less than 20%.
Primary mirror is that bore is the recessed non-spherical reflector of circular contour of 2m, and it is the circular hole of 0.1m that there is radius at center.The radius-of-curvature of primary mirror is 5634.92mm, and circular cone coefficient is-0.9732, and summit and scanning mirror center are at a distance of 2305mm.
Secondary mirror is that bore is the circular contour convex aspheric surface catoptron of 0.46m.The radius-of-curvature of secondary mirror is 1331.82mm, and circular cone coefficient is-1.8967, and its summit and primary mirror summit are at a distance of 3110.71mm.
The profile of the first plane mirror is the rectangle of long 600mm, wide 180mm, and its center and secondary mirror summit are at a distance of 3110.71mm, and its effect is the light path of turning back, and shortens the length of optical system.
Three mirrors are the recessed non-spherical reflector of the square contour of long 0.8m, wide 0.44m.The radius-of-curvature of three mirrors is 3048.23mm, and circular cone coefficient is-3.1563, and its summit and the first plane mirror center are at a distance of 1278.18mm.
The profile of the second plane mirror is the rectangle of long 310mm, wide 180mm, and its center and 3 vertex points are at a distance of 1400.20mm, and its effect is the light path of turning back, and shortens the length of optical system.
Along in rotor shaft direction, visual field is 1.7
o; On swaying direction, visual field is 0.1
o.
Image planes region is the rectangle of long 0.5m, wide 0.1m.CCD device is selected line array CCD splicing.It is visible light wave range that the present invention adopts service band, and pixel dimension is the detection length that the line array CCD one dimension of 10 μ m is spliced into 0.5m.Utilize the rotation of scanning mirror, can obtain larger observation scope.
The present invention adopts dynamic optical transfer function analysis method to study continuous sweep imaging optical system imaging performance, has provided the reasonable angular velocity of rotation of scanning mirror of continuous sweep mirror and the type of drive of scanning mirror.The bore of the optical system the present invention relates to is 2m, and focal length is 20m, when adopting pixel dimension to be the CCD of 10 μ m, can on geostationary orbit, realize the ground observation resolution of 16.2m.
Accompanying drawing explanation
Fig. 1 is large-aperture long-focus continuous sweep imaging optical system schematic diagram of the present invention.
Fig. 2 is while the time shutter being 0.5ms, the MTF curve of scanning mirror under different rotary angular velocity.
Fig. 3 is while the time shutter being 1ms, the MTF curve of scanning mirror under different rotary angular velocity.
Fig. 4 is while the time shutter being 1.5ms, the MTF curve of scanning mirror under different rotary angular velocity.
Fig. 5 is scanning mirror drive principle figure.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is further described; but be not limited to this; every technical solution of the present invention is modified or is equal to replacement, and not departing from the spirit and scope of technical solution of the present invention, all should be encompassed in protection scope of the present invention.
As shown in Figure 1, large-aperture long-focus continuous sweep imaging optical system provided by the invention, comprises following part: scanning mirror 1, primary mirror 2, secondary mirror 3, the first plane mirror 4, three mirrors 5, the second plane mirror 6 and image planes 7.The visible ray process of terrestrial radiation is 45 with optical axis included angle
oscanning mirror 1 collect and reflex to primary mirror 2 surfaces, primary mirror 2 by convergence of rays to secondary mirror 3 surfaces, secondary mirror 3 projects the first plane mirror 4 surfaces after light is slightly dispersed, the first plane mirror 4 is 45 with optical axis included angle
o, light path can be rotated to 90
oafter project three mirror 5 surfaces, three mirrors 5 by convergence of rays to optical axis included angle be 10
othe second mirror surface 6, the second catoptrons 6 by optical reflection to image planes 7, for CCD device, receive.
Scanning mirror with optical axis included angle 45
ostatic position be benchmark reciprocating rotation, can realize ground continuous sweep imaging.The maximum rotation scope of scanning mirror is no more than ± and 10
o, variable angle scope scanning mirror and optical axis is 35
o~ 55
obetween.
The bore of optical system is 2m, and focal length is 20m, belongs to heavy caliber, long-focal distance optical system, and the bore of primary mirror 2 is 2m, need to guarantee enough machining precisioies.The detection of 2 shapes of primary mirror can adopt penalty method, detects with dynamic interferometer.
As shown in Figure 1, light path must be built in strict accordance with the structure of schematic diagram and location parameter.Because the length of optical system is 3.7m, sufficiently stable supporting construction must be set.
As shown in Figure 1, the length of optical system is large, and focal length is long, and the detection of system focal length can adopt magnification method.But testing environment must keep constant temperature, and separating vibration, very harsh to requirement for experiment condition.
As shown in Figure 1, the bore of optical system is large, and the detection of the static MTF of optical system is also difficult point.Can adopt the parallel light tube of 2m bore to detect.If there is no the parallel light tube of 2m bore, can adopt bore is each regional area of the small-bore parallel light tube measurement optical system bore between 0.5 ~ 1m, then data is processed, and calculates the result of MTF.
In the present invention, the service band of optical system can be visible ray or infrared band.After service band is determined, will, according to the corresponding photodetector of band selection, conventionally select CCD.CCD can select linear array, also can select face battle array, but the cost of area array CCD is higher.Choose after CCD, CCD is combined into the combinations of detectors that can cover 0.5m length according to product word structure.
Optical system work and geostationary orbit, in the different moment, ground irradiance is different.At observation north latitude 23
oground region time, can calculate 8:00,12:00, the ground irradiance in tri-moment of 16:00, thereby calculate integral time, be 0.5 ~ 1.5ms.
As in Figure 2-4, the integral time that adopts dynamic transfer function analytical approach to draw is while being 0.5ms, 1ms, 1.5ms, the MTF curve of scanning mirror under different rotary angular velocity.The anglec of rotation of scanning mirror should be less than 7 × 10
-6o, guarantee mtf value declines and is less than 20%.And 7 × 10
-6oangular velocity too small, cannot adopt bearing of motor realize.
As shown in Figure 5, the end points movement velocity of scanning mirror 1 is 0.1728 μ m/ms, and the displacement in 1ms is only 0.1728 μ m.Can adopt at two end points of scanning mirror 1 piezoelectric ceramics motor is installed, two motor are shifted scanning mirror onto according to contrary direction, make scanning mirror 1 mobile 0.1728 μ m in 1ms.
Claims (10)
1. large-aperture long-focus continuous sweep imaging optical system, it is characterized in that described optical system comprises following part: scanning mirror (1), primary mirror (2), secondary mirror (3), the first plane mirror (4), three mirrors (5), the second plane mirror (6) and image planes (7), primary mirror (2) surface is collected and reflexed to the visible ray process scanning mirror (1) of terrestrial radiation, primary mirror (2) arrives secondary mirror (3) surface by convergence of rays, secondary mirror (3) is by ray cast to the first plane mirror (4) surface, and the first plane mirror (4) is by light path rotation 90
oafter project three mirrors (5) surface, three mirrors (5) are by convergence of rays to the second mirror surface (6), the second catoptron (6) to image planes (7), receives light reflection for CCD device.
2. large-aperture long-focus continuous sweep imaging optical system according to claim 1, it is characterized in that described scanning mirror (1) with optical axis included angle 45
ostatic position be benchmark reciprocating rotation, realize ground continuous sweep imaging, the variable angle scope of scanning mirror (1) and optical axis is 35 ~ 55
obetween; The first plane mirror (4) is 45 with optical axis included angle
o; The second mirror surface (6) is 10 with optical axis included angle
o.
3. large-aperture long-focus continuous sweep imaging optical system according to claim 1 and 2, is characterized in that the rectangular planes catoptron that described scanning mirror (1) is long 2.85m, wide 2m.
4. large-aperture long-focus continuous sweep imaging optical system according to claim 1 and 2, is characterized in that, at time shutter scope 0.5-1.5ms, the anglec of rotation of scanning mirror (1) is less than 7 × 10
-6o.
5. large-aperture long-focus continuous sweep imaging optical system according to claim 1, is characterized in that the recessed non-spherical reflector of circular contour that described primary mirror (2) is 2m for bore, and it is the circular hole of 0.1m that there is radius at center.
6. large-aperture long-focus continuous sweep imaging optical system according to claim 1, is characterized in that the circular contour convex aspheric surface catoptron that described secondary mirror (3) is 0.46m for bore.
7. large-aperture long-focus continuous sweep imaging optical system according to claim 1 and 2, the profile that it is characterized in that described the first plane mirror (4) is the rectangle of long 600mm, wide 180mm.
8. large-aperture long-focus continuous sweep imaging optical system according to claim 1, is characterized in that the recessed non-spherical reflector of square contour that described three mirrors (5) are long 0.8m, wide 0.44m.
9. large-aperture long-focus continuous sweep imaging optical system according to claim 1 and 2, the profile that it is characterized in that described the second plane mirror (6) is the rectangle of long 310mm, wide 180mm.
10. large-aperture long-focus continuous sweep imaging optical system according to claim 1, is characterized in that described image planes (7) region is the rectangle of long 0.5m, wide 0.1m.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105371960A (en) * | 2015-12-05 | 2016-03-02 | 中国航空工业集团公司洛阳电光设备研究所 | Circumferential scanning imaging control method and circumferential scanning imaging system |
| CN107589536A (en) * | 2017-08-29 | 2018-01-16 | 北京空间机电研究所 | A kind of small relative aperture folds light path coaxial system |
| CN115685535A (en) * | 2022-11-18 | 2023-02-03 | 中国科学院长春光学精密机械与物理研究所 | Dynamic scanning optical system based on optical fast-swinging mirror |
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| US20050094235A1 (en) * | 2003-10-30 | 2005-05-05 | Canon Kabushiki Kaisha | Optical scanning apparatus and image forming apparatus using the same |
| CN101303449A (en) * | 2008-07-10 | 2008-11-12 | 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 |
| CN102087407A (en) * | 2010-12-30 | 2011-06-08 | 中国科学院长春光学精密机械与物理研究所 | Off-axis total reflection optical system with huge field of view |
| CN102736237A (en) * | 2012-06-18 | 2012-10-17 | 北京空间机电研究所 | Optical system for space astronomical observation infra-red telescope |
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2014
- 2014-02-21 CN CN201410059422.6A patent/CN103760668B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050094235A1 (en) * | 2003-10-30 | 2005-05-05 | Canon Kabushiki Kaisha | Optical scanning apparatus and image forming apparatus using the same |
| CN101303449A (en) * | 2008-07-10 | 2008-11-12 | 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 |
| CN102087407A (en) * | 2010-12-30 | 2011-06-08 | 中国科学院长春光学精密机械与物理研究所 | Off-axis total reflection optical system with huge field of view |
| CN102736237A (en) * | 2012-06-18 | 2012-10-17 | 北京空间机电研究所 | Optical system for space astronomical observation infra-red telescope |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105371960A (en) * | 2015-12-05 | 2016-03-02 | 中国航空工业集团公司洛阳电光设备研究所 | Circumferential scanning imaging control method and circumferential scanning imaging system |
| CN107589536A (en) * | 2017-08-29 | 2018-01-16 | 北京空间机电研究所 | A kind of small relative aperture folds light path coaxial system |
| CN115685535A (en) * | 2022-11-18 | 2023-02-03 | 中国科学院长春光学精密机械与物理研究所 | Dynamic scanning optical system based on optical fast-swinging mirror |
| CN115685535B (en) * | 2022-11-18 | 2023-10-24 | 中国科学院长春光学精密机械与物理研究所 | Dynamic scanning optical system based on optical quick-swing mirror |
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Effective date of registration: 20200331 Address after: 150001 No. 118 West straight street, Nangang District, Heilongjiang, Harbin Patentee after: Harbin University of technology high tech Development Corporation Address before: 150000 Harbin, Nangang, West District, large straight street, No. 92 Patentee before: HARBIN INSTITUTE OF TECHNOLOGY |