CN103760668B - Large-aperture long-focus continuous sweep imaging optical system - Google Patents
Large-aperture long-focus continuous sweep imaging optical system Download PDFInfo
- Publication number
- CN103760668B CN103760668B CN201410059422.6A CN201410059422A CN103760668B CN 103760668 B CN103760668 B CN 103760668B CN 201410059422 A CN201410059422 A CN 201410059422A CN 103760668 B CN103760668 B CN 103760668B
- Authority
- CN
- China
- Prior art keywords
- mirror
- optical system
- long
- continuous sweep
- imaging optical
- 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.)
- Active
Links
Landscapes
- Facsimile Scanning Arrangements (AREA)
Abstract
Large-aperture long-focus continuous sweep imaging optical system, belongs to remote sensing Optical System Design and image quality analysis technical field.Described optical system comprises with lower 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 of terrestrial radiation is collected through scanning mirror (1) and reflexes to primary mirror (2) surface, primary mirror (2) by convergence of rays to secondary mirror (3) surface, secondary mirror (3) projects the first plane mirror (4) surface after slightly being dispersed by light, light path is rotated 90 by the first plane mirror (4)
oafter project three mirrors (3) surface, three mirrors (3) by convergence of rays to the second catoptron (6) surface, optical reflection to image planes (7), receives for CCD device by the second catoptron (6).Optical system of the present invention can realize large-scale high-resolution imaging function on 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 that geostationary orbit works equips heavy-caliber optical system usually.Remote sensing optical system on geostationary orbit and ground observation point geo-stationary, 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.Ground optical system can be made when scanning mirror swings to 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 will be deteriorated.How to determine that rational sweep velocity guarantees 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 a kind of heavy caliber focal length machine continuous sweep imaging optical system, 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 with lower part: scanning mirror, primary mirror, secondary mirror, the first plane mirror, three mirrors, the second plane mirror and image planes, and it is 45 that the visible ray of terrestrial radiation passes through 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 slightly being dispersed by light, and the first plane mirror and optical axis included angle are 45
o, light path can be rotated 90
oafter project three mirrors surfaces, three mirrors by convergence of rays to being 10 with optical axis included angle
othe second mirror surface, optical reflection to image planes, receives for CCD device by the second catoptron.
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, namely scanning mirror is 35 with the variable angle scope of optical axis
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 exposure time range 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%.
The recessed non-spherical reflector of circular contour of primary mirror to be bore be 2m, center has radius to be the circular hole of 0.1m.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.
The circular contour convex aspheric surface catoptron of secondary mirror to be bore be 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 light path of turning back, and shorten the length of optical system.
Three mirrors are the recessed non-spherical reflector of 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 three vertexes point are at a distance of 1400.20mm, and its effect is light path of turning back, and shorten 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 selects linear CCD assembling techniques.The present invention adopts service band to be visible light wave range, and pixel dimension is the detection length that the line array CCD one dimension of 10 μm is spliced into 0.5m.Utilize the rotation of scanning mirror, larger observation scope can be obtained.
The present invention adopts dynamic optical transfer function analysis technique study continuous sweep imaging optical system imaging performance, gives the reasonable angular velocity of rotation of the scanning mirror of continuous sweep mirror and the type of drive of scanning mirror.The bore of the optical system that the present invention relates to is 2m, and focal length is 20m, when adopting pixel dimension to be the CCD of 10 μm, can realize the ground observation resolution of 16.2m on geostationary orbit.
Accompanying drawing explanation
Fig. 1 is large-aperture long-focus continuous sweep imaging optical system schematic diagram of the present invention.
Fig. 2 is the time shutter when being 0.5ms, the MTF curve of scanning mirror under different rotary angular velocity.
Fig. 3 is the time shutter when being 1ms, the MTF curve of scanning mirror under different rotary angular velocity.
Fig. 4 is the time shutter when 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 thereto; everyly technical solution of the present invention modified or equivalent to replace, 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 with lower part: scanning mirror 1, primary mirror 2, secondary mirror 3, first plane mirror 4, three mirror 5, second plane mirror 6 and image planes 7.It is 45 that the visible ray of terrestrial radiation passes through with optical axis included angle
oscanning mirror 1 collect and reflex to primary mirror 2 surface, primary mirror 2 by convergence of rays to secondary mirror 3 surface, secondary mirror 3 projects the first plane mirror 4 surface after slightly being dispersed by light, the first plane mirror 4 and optical axis included angle are 45
o, light path can be rotated 90
oafter project three mirrors 5 surfaces, three mirrors 5 by convergence of rays to being 10 with optical axis included angle
othe second mirror surface 6, second catoptron 6 by optical reflection to image planes 7, receive 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, namely scanning mirror is 35 with the variable angle scope of optical axis
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, needs to ensure enough machining precisioies.The detection of primary mirror 2 shapes 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.Length due to optical system is 3.7m, must arrange sufficiently stable supporting construction.
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.The parallel light tube of 2m bore can be adopted to detect.If there is no the parallel light tube of 2m bore, bore can be adopted to be each regional area that optical system bore measured by small-bore parallel light tube between 0.5 ~ 1m, then data to be processed, calculate 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, according to the corresponding photodetector of band selection, usually will select CCD.CCD can select linear array, also can to select face battle array, but the cost of area array CCD is higher.After choosing CCD, CCD is combined into the combinations of detectors that can cover 0.5m length according to product word structure.
Optical system works and geostationary orbit, when different when, ground irradiance is different.At observation north latitude 23
oground region time, the ground irradiance in tri-moment of 8:00,12:00,16:00 can be calculated, thus to calculate integral time be 0.5 ~ 1.5ms.
As in Figure 2-4, when the integral time adopting dynamic transfer function analytical approach to draw is 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, bearing of motor cannot be adopted to realize.
As shown in Figure 5, the end points movement velocity of scanning mirror 1 is 0.1728 μm/ms, and the displacement in 1ms is only 0.1728 μm.Can adopt and install piezoelectric ceramics motor at two end points of scanning mirror 1, two motor shift scanning mirror onto according to contrary direction, make scanning mirror 1 move 0.1728 μm in 1ms.
Claims (9)
1. large-aperture long-focus continuous sweep imaging optical system, it is characterized in that described optical system comprises with lower 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 of terrestrial radiation is collected through scanning mirror (1) and reflexes to primary mirror (2) surface, primary mirror (2) by convergence of rays to secondary mirror (3) surface, secondary mirror (3) is by ray cast to the first plane mirror (4) surface, and light path is rotated 90 by the first plane mirror (4)
oafter project three mirrors (5) surface, three mirrors (5) by convergence of rays to the second mirror surface (6), the second catoptron (6) by light reflection to image planes (7), for CCD device reception, 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; First plane mirror (4) and optical axis included angle are 45
o; Second mirror surface (6) and optical axis included angle are 10
o.
2. large-aperture long-focus continuous sweep imaging optical system according to claim 1, is characterized in that described scanning mirror (1) is long 2.85m, the rectangular planes catoptron of wide 2m.
3. large-aperture long-focus continuous sweep imaging optical system according to claim 1, is characterized in that at exposure time range 0.5-1.5ms, and the anglec of rotation of scanning mirror (1) is less than 7 × 10
-6o.
4. large-aperture long-focus continuous sweep imaging optical system according to claim 1, it is characterized in that described primary mirror (2) for bore be the recessed non-spherical reflector of circular contour of 2m, center has radius to be the circular hole of 0.1m.
5. large-aperture long-focus continuous sweep imaging optical system according to claim 1, it is characterized in that described secondary mirror (3) for bore be the circular contour convex aspheric surface catoptron of 0.46m.
6. large-aperture long-focus continuous sweep imaging optical system according to claim 1, is characterized in that the profile of described first plane mirror (4) is the rectangle of long 600mm, wide 180mm.
7. large-aperture long-focus continuous sweep imaging optical system according to claim 1, is characterized in that described three mirrors (5) are long 0.8m, the recessed non-spherical reflector of square contour of wide 0.44m.
8. large-aperture long-focus continuous sweep imaging optical system according to claim 1, is characterized in that the profile of described second plane mirror (6) is the rectangle of long 310mm, wide 180mm.
9. 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410059422.6A CN103760668B (en) | 2014-02-21 | 2014-02-21 | Large-aperture long-focus continuous sweep imaging optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410059422.6A CN103760668B (en) | 2014-02-21 | 2014-02-21 | Large-aperture long-focus continuous sweep imaging optical system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103760668A CN103760668A (en) | 2014-04-30 |
| CN103760668B true CN103760668B (en) | 2015-12-09 |
Family
ID=50527929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410059422.6A Active CN103760668B (en) | 2014-02-21 | 2014-02-21 | Large-aperture long-focus continuous sweep imaging optical system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103760668B (en) |
Families Citing this family (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 |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101303449A (en) * | 2008-07-10 | 2008-11-12 | 北京空间机电研究所 | Double-view-field off-axis three-mirror integrated optical system sharing primary and secondary mirrors |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005134624A (en) * | 2003-10-30 | 2005-05-26 | Canon Inc | Optical scanner and image forming apparatus using same |
-
2014
- 2014-02-21 CN CN201410059422.6A patent/CN103760668B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101303449A (en) * | 2008-07-10 | 2008-11-12 | 北京空间机电研究所 | Double-view-field off-axis three-mirror integrated optical system sharing primary and secondary mirrors |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103760668A (en) | 2014-04-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103471715B (en) | A kind of light path combined type light field spectrum imaging method and device altogether | |
| CN103791860B (en) | The tiny angle measurement device and method of view-based access control model detection technique | |
| US11592563B2 (en) | Apparatuses and methods for a rotating optical reflector | |
| US8887587B2 (en) | Measurement device | |
| CN103760668B (en) | Large-aperture long-focus continuous sweep imaging optical system | |
| Tian et al. | Digital zenith telescope prototype of China | |
| JP2009229462A (en) | Detection device | |
| CN104539829A (en) | Optical-mechanical structure based on infrared area array detector scanning imaging | |
| CN109901191B (en) | Rotary scanning type laser radar imaging device | |
| CN104483750A (en) | Large-image-plane interscan time-sharing imaging optical system | |
| CN102012219B (en) | Airborne panoramic rotor same taper measurement device | |
| JP2021521045A (en) | Unmanned aerial vehicles and related systems and methods for stereoscopic imaging | |
| CN107014293A (en) | A kind of photogrammetric survey method of camera scanning imaging | |
| CN106125280A (en) | Zigzag type optical system for field stitching | |
| CN202041704U (en) | K eyepiece reciprocating two-way de-spinning structure for aviation optical remote sensor | |
| CN103777350A (en) | Coaxial three-mirror zooming optical system based on photoisomerization materials | |
| CN110657782A (en) | Novel single-lens three-dimensional surveying and mapping device and method | |
| US8358457B2 (en) | Miniature rotating transmissive optical drum scanner | |
| US3765743A (en) | Optical energy detection system including image plane scanning system | |
| CN204964030U (en) | Opto mechanical structure based on infrared area array detector scanning imagery | |
| CN213903945U (en) | Double fast reflecting mirror imaging system for compensating image motion | |
| CN105444998A (en) | Device and method for measuring visual magnification of telescopic system | |
| CN112285913B (en) | Dual-fast-reflection mirror imaging system capable of compensating image shift | |
| JP2016532101A (en) | System structure for line scanner with fixed projection area, fixed GSD, fixed spatial resolution | |
| CN102012562B (en) | Method and system for scanning terahertz waves |
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 | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
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 |