CN101158746A - Space large caliber compression light beam relaying scanned imagery optical system - Google Patents
Space large caliber compression light beam relaying scanned imagery optical system Download PDFInfo
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- CN101158746A CN101158746A CNA2007101781361A CN200710178136A CN101158746A CN 101158746 A CN101158746 A CN 101158746A CN A2007101781361 A CNA2007101781361 A CN A2007101781361A CN 200710178136 A CN200710178136 A CN 200710178136A CN 101158746 A CN101158746 A CN 101158746A
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Abstract
A space large-caliber compression beam relay scanning imaging optical system mainly consists of a non-focus telescope system, a scanning device and a focusing system; the non-focus telescope system consists of an object lens system formed by a paraboloid main reflecting mirror M1, and a convex hyperboloid hypo-reflecting mirror M2, and a relay reflecting mirror M3, the field focus of the M3 superposes with the image focus of the field lens system; the non-focus telescope system collects the radiation light beam of the ground object, and a caliber of an incidence light beam is compressed and then the incidence light beam comes out with a parallel light mode, an output light beam passes through the scanning by the scanning device and enters the latter focus imaging system so as to image. The invention is applicable to the space application large-caliber (the order of magnitude is meter) compression beam scanning imaging system, the preparation, processing and control problems of the large-caliber scanning mirror is avoided, and the environmental adaptability is strong, the invention is suitable for space applications.
Description
Technical field
The invention belongs to the space optical remote sensor optical technical field, relate to a kind of space large caliber compression light beam multispectral imaging optical imaging system.
Background technology
A kind of means that the space infrared imagery technique obtains as space remote sensing information have very important value at spatial information aspect obtaining.The common infrared optical system that is applied to aerial image mainly can be divided into face battle array staring imaging, push-broom type imaging and short-term battle array scan-type imaging three major types, be limited by the restriction of infrared focal plane detector technology and big refrigerating capacity Refrigeration Technique at present, domestic and international application is in the majority with short-term battle array scan-type imaging mode in the optical system of space infrared imaging.
The scan-type imaging system that is applied to the space infrared imaging mainly adopts the form of object space scanning, this imaging optical system adopts short infrared ray array detector, as shown in Figure 1, by in the light path of the telescopic system front of small field of view, adding sweep unit, carry out the scanning of spanning platform heading by sweep unit, and obtain the two dimensional image of ground object target by means of the motion of platform.
But along with the demand to the space infrared imaging system of high-resolution constantly increases, the bore of inevitable requirement space infrared imaging optical system also increases thereupon.Make the also corresponding increase of sweep unit bore of object space scanning imaging system.Thereby brought processing, preparation and the control difficult problem of heavy caliber sweep unit, and the development difficulty of entire system.
Be applied to the optical system of ground forward looking in frared system (FLIR) by transmission-type and realize the light beam compression of small-bore (magnitude for centimetre) and the scanning of big visual field, but bad adaptability, to the environment requirement height, be difficult to realize the compression and the scanning of heavy-caliber optical system, and the optical system of transmission-type is difficult to realize multispectral section scanning imagery, the application of incompatibility space.
Summary of the invention:
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, heavy caliber (magnitude is rice) the compression light beam scanning imaging system that provides a kind of suitable space to use, thereby avoided the difficult problem of preparation, processing and the control of heavy caliber scanning mirror, and environmental suitability is strong, is fit to the space and uses.
The technical matters that the present invention solves also comprises multispectral section scanning imagery having realized large caliber compression light beam.
Technical solution of the present invention: Space large caliber compressing light beam relay scanning image optical system, it is characterized in that: it mainly is made up of no burnt telescopic system, scanister and focusing system, described no burnt telescopic system is made up of objective system and the relay mirror M3 that principal reflection mirror M1, secondary mirror M2 form, and the focus in object space of relay mirror M3 overlaps with the rear focus of objective system; Do not have burnt telescopic system and collect the radiation laser beam of terrain object, and after the bore of incident beam compressed again with the form outgoing of directional light, outgoing beam is through the later focusing image-forming system imaging that enters the back of scanister scanning.
According to the situation of spectral coverage, optical system of the present invention can also be provided with colour esensitized equipment, and the parallel beam that receives after scanister scans carries out the spectral coverage division, and the light beam of different spectral coverage enters corresponding focusing system imaging.
Described principal reflection mirror M1 is parabola or ellipsoidal mirror, and described secondary mirror M2 is protruding hyperboloidal mirror.
When the focal length of the objective system of described no burnt telescopic system is f
1, the focal length of relay mirror M3 is f
2, the focal length of focusing system is f
3The time, the light beam ratio of compression that does not then have burnt telescopic system is M=f
1/ f
2, the focal distance f=M of whole optical system * f
3
Described no burnt telescopic system entrance pupil is arranged on the principal reflection mirror M1, and described scanister is made up of flat scanning mirror and drive motor, and the flat scanning mirror is positioned at the emergent pupil place of no burnt telescopic system; At this moment, the optics bore of described flat scanning mirror is the 1/M of principal reflection mirror M1 bore, and wherein M is the light beam ratio of compression of no burnt telescopic system.
The present invention's advantage compared with prior art:
(1) heavy caliber of the present invention (magnitude is a rice) compression light beam scanning imaging system, do not collect the radiation laser beam of terrain object by there being burnt telescopic system, and after the bore of incident beam compressed again with the form outgoing of directional light, required effective clear aperture of sweep unit is reduced to 1/M (wherein M is the focal length of objective system in the no burnt telescopic system and the ratio of the focal length of relay mirror) thereby has avoided the difficult problem of preparation, processing and the control of heavy caliber scanning mirror, and environmental suitability is strong, is fit to the space and uses.
(2) colour esensitized equipment of imaging system of the present invention carries out the spectral coverage division to the parallel beam that receives after scanister scans, and has realized multispectral section focal imaging.
(3) under same object space scanning accuracy, the present invention is the 1/M of object space scanning system only to the scanning linearity degree of sweep unit and the requirement of degree of repeatability, has reduced the technical requirement of scanning system;
(4) compare with small-bore forward looking infrared system, Space large caliber compressing light beam relay scanning image optical system has not only been realized bigbore compression light beam, has avoided the preparation and the processing difficult problem of heavy caliber infrared optical material; And strong to the adaptability of environment, can be applied to the space.
(5) reflective no burnt telescopic system is insensitive for space temperature and the relative refraction type of other such environmental effects system, has reduced the requirement of space infrared imaging system to the remote sensor temperature control system;
(6) reflective no burnt telescopic system no color differnece, and the light beam through there not being burnt telescopic system outgoing is a directional light, helps follow-up beam split design, thereby can realize infrared multispectral section imaging;
(7) the present invention both can be applied to space large caliber infrared scanning imaging system, by realize the imaging of big visual field than short-term array detector array, also can be used for purposes such as steady picture in space and IMC.
Description of drawings
Fig. 1 prior art object space scanning imagery scheme synoptic diagram;
Fig. 2 Space large caliber compressing light beam relay scanning image optical system synoptic diagram of the present invention.
Embodiment
The invention belongs to space optical remote sensor optical design technical field.Space large caliber compressing light beam relay scanning image optical system, successively by big visual field do not have burnt telescopic system, middle oscillatory scanning parts, colour esensitized equipment and follow-up focusing system four parts combine.The effect of not having burnt telescopic system is exactly a radiation laser beam of collecting terrain object, and after the bore of incident beam compressed again with the form outgoing of directional light, outgoing beam is through being positioned over the later focusing image-forming system imaging that enters the back of scanning mechanism scanning at no burnt telescopic system emergent pupil place.The optics bore of sweep unit and scanning linearity degree approximate the 1/M of object space scanned imagery optical system among Fig. 1, and wherein M is the light beam ratio of compression of no burnt telescopic system.Under the identical situation of aerial image infrared optical system bore, the 1/M that sweep unit effective aperture that compression light beam relaying scanning imagery of the present invention is required and scanning linearity degree are the object space scanning imaging system, thereby the development difficulty of reduction Generation Space-Based Infrared Scanning imaging optical system by a relatively large margin; Colour esensitized equipment is used to realize the division of spectral coverage, not essential according to actual conditions, when the spectral coverage broad of incident beam, in the time of need dividing, colour esensitized equipment just can be set realize carrying out spectral coverage and dividing, and the focusing system that enters corresponding spectral coverage is respectively carried out imaging scanning later parallel beam.Do not have burnt telescopic system and adopt reflective structure, it is wide to have an imaging spectral coverage, material preparation, simple, stronger to the space environment applicability characteristics of processing; Do not have the compression parallel beam of burnt telescopic system institute outgoing, help the expansion of system imaging spectral coverage.The present invention can also be applied to applications such as the steady picture of aerial image system and optics IMC.
As shown in Figure 2, M1 is parabolic principal reflection mirror, and M2 is protruding hyperboloid secondary mirror, mirror M 1, M2 constituent mirror system.The focus in object space of mirror M 3 overlaps with the rear focus F of objective system, and like this, mirror M 3 has just constituted a no burnt telescopic system with the objective system of its front; The optical system entrance pupil is arranged on the principal reflection mirror M1, and the linear sweep device of being made up of flat scanning mirror and drive motor is positioned at the emergent pupil place of no burnt telescopic system; The imaging beam of the different visual fields of the ground scenery that comes incides no burnt telescopic system, through no burnt telescopic system light beam is compressed after M times, and the form with parallel beam arrives the scanning mirror device again; The effect of scanning mirror device is that the color separation film (being colour esensitized equipment) that enters the back is pointed in the scanning of the compression light beam of next different visual fields; The wide spectrum imaging beam of the scenery that comes is divided into a plurality of sub-spectral coverages through color separation film, and the imaging beam of last different sub-spectral coverages enters focusing image-forming system; Focusing image-forming system utilizes the secondary imaging principle to form by the lens combination of positive light coke, realizes the focal imaging of compression light beam.Realize emergent pupil and the position of detector dewar window and the coupling of size of no burnt telescopic system.
Imaging system of the present invention mainly comprises the reflective no burnt telescopic system of heavy caliber, scanister, focusing system.When incident beam spectral coverage broad, also comprise colour esensitized equipment, carry out multispectral section imaging.If not having preceding group of object lens (being made up of M1 and the M2) focal length of burnt telescopic system is f
1, the focal length of back group object lens (M3) is f
2, the focal length of focus lens group is f
3The light velocity ratio of compression that does not then have burnt telescopic system is M=f
1/ f
2, the focal length of whole space large caliber compression light beam relaying scanning imaging system is by the focal distance f of the light beam ratio of compression of no burnt telescopic system and follow-up focal imaging
3Determine, i.e. focal distance f=the M of system * f
3
For the object space scanning imaging system of bigbore space, the effective aperture of the desired sweep unit of Space large caliber compressing light beam relay scanning image optical system only is the 1/M of object space scanning system, and the scanning linearity degree requires also to become the 1/M with bore object space scanning system.Thereby greatly reduce the development difficulty and the cycle of heavy caliber Generation Space-Based Infrared Scanning optical system, simultaneously, the light beam that compresses through no burnt telescopic system is a parallel beam, helps the expansion of system imaging spectral coverage.
With the design bore is 1m, and focal distance f is 3 meters a space infrared imaging system, if adopt traditional object space scan mode, scanning mirror is positioned at primary mirror the place ahead and places with 45 degree, and then the minimum dimension of scanning mirror is 1 * 1.414m ().
Adopt the large caliber compression light beam scanning imagery scheme that this programme proposed, if Project Realization difficulty acceptable scanning mirror is of a size of 10cm, the light beam ratio of compression that then can choose no burnt telescopic system is 1m/0.1m=10 times, the focal distance f 3 of choosing focusing system like this is 0.3m, then can realize the system requirements of total system focal length 0.3m * 10=3m.The light beam compression multiple is can being decomposed into of the burnt telescopic system of 10 nothing: bore 1m, and focal distance f 1 is that objective system and the focal distance f 2 of 6m is the relay mirror M3 of 0.6m; The objective system that is focused to 6m can be 2230mm by the radius-of-curvature of parabolic principal reflection mirror M1, the radius-of-curvature of protruding hyperboloid secondary mirror M2 is 643mm, two mirrors 857mm are at interval realized, also can utilize the two-mirror system method for designing, and carry out other forms of decomposition according to other constraint conditions.
System described above is a kind of situation of the invention process, and those skilled in the art can carry out various improvement and replacing not departing from according to different requirements and design parameter under the situation of the present invention, and therefore, the present invention is widely.
Claims (6)
1. Space large caliber compressing light beam relay scanning image optical system, it is characterized in that: it mainly is made up of no burnt telescopic system, scanister and focusing system, described no burnt telescopic system is made up of objective system and the relay mirror M3 that principal reflection mirror M1, secondary mirror M2 form, and the focus in object space of relay mirror M3 overlaps with the rear focus of objective system; Do not have burnt telescopic system and collect the radiation laser beam of terrain object, and after the bore of incident beam compressed again with the form outgoing of directional light, outgoing beam is through the later focusing image-forming system imaging that enters the back of scanister scanning.
2. Space large caliber compressing light beam relay scanning image optical system according to claim 1, it is characterized in that: it also comprises colour esensitized equipment, the parallel beam that receives after scanister scans carries out the spectral coverage division, and the light beam of different spectral coverage enters corresponding focusing system imaging.
3. Space large caliber compressing light beam relay scanning image optical system according to claim 1 and 2 is characterized in that: described principal reflection mirror M1 is parabola or ellipsoidal mirror, and described secondary mirror M2 is protruding hyperboloidal mirror.
4. Space large caliber compressing light beam relay scanning image optical system according to claim 1 and 2 is characterized in that: when the focal length of the objective system of described no burnt telescopic system is f
1, the focal length of relay mirror M3 is f
2, the focal length of focusing system is f
3The time, the light beam ratio of compression that does not then have burnt telescopic system is M=f
1/ f
2, the focal distance f=M of whole optical system * f
3
5. Space large caliber compressing light beam relay scanning image optical system according to claim 1 and 2, it is characterized in that: described no burnt telescopic system entrance pupil is arranged on the principal reflection mirror M1, described scanister is made up of flat scanning mirror and drive motor, and the flat scanning mirror is positioned at the emergent pupil place of no burnt telescopic system.
6. Space large caliber compressing light beam relay scanning image optical system according to claim 5 is characterized in that: the optics bore of described flat scanning mirror is the 1/M of principal reflection mirror M1 bore, and wherein M is the light beam ratio of compression of no burnt telescopic system.
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| CNB2007101781361A CN100504495C (en) | 2007-11-27 | 2007-11-27 | Relay scanning imaging optical system of space large caliber compression light beam |
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| CNB2007101781361A CN100504495C (en) | 2007-11-27 | 2007-11-27 | Relay scanning imaging optical system of space large caliber compression light beam |
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| CN100504495C CN100504495C (en) | 2009-06-24 |
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| RU2449329C2 (en) * | 2010-07-21 | 2012-04-27 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Сибирский государственный аэрокосмический университет имени академика М.Ф. Решетнева" (СибГАУ) | Catadioptric telescope |
| CN102508361A (en) * | 2011-10-31 | 2012-06-20 | 北京空间机电研究所 | Spatial large view field, superwide spectral band and multispectral imaging optical system |
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| CN102073147A (en) * | 2010-12-23 | 2011-05-25 | 中国科学院西安光学精密机械研究所 | Multi-telescope optical synthetic aperture imaging system and design method thereof |
| CN102073147B (en) * | 2010-12-23 | 2012-06-27 | 中国科学院西安光学精密机械研究所 | Multi-telescope optical synthetic aperture imaging system and design method thereof |
| CN102508361A (en) * | 2011-10-31 | 2012-06-20 | 北京空间机电研究所 | Spatial large view field, superwide spectral band and multispectral imaging optical system |
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