CN107807441B - catadioptric optical imaging system - Google Patents
catadioptric optical imaging system Download PDFInfo
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- CN107807441B CN107807441B CN201711174214.0A CN201711174214A CN107807441B CN 107807441 B CN107807441 B CN 107807441B CN 201711174214 A CN201711174214 A CN 201711174214A CN 107807441 B CN107807441 B CN 107807441B
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- speculum
- imaging system
- optical imaging
- catadioptric optical
- positive lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0804—Catadioptric systems using two curved mirrors
- G02B17/0816—Catadioptric systems using two curved mirrors off-axis or unobscured systems in which not all of the mirrors share a common axis of rotational symmetry, e.g. at least one of the mirrors is warped, tilted or decentered with respect to the other elements
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Abstract
The present invention provides a kind of catadioptric optical imaging system comprising：The first speculum, the second speculum, positive lens and the negative lens being sequentially arranged successively in same optical axis and along the direction of propagation of light, reflecting surface of the reflecting surface of first speculum towards second speculum, the central area of first speculum offer for the light after being reflected by second speculum by and reach the central through holes of detector image planes, the positive lens and the negative lens are sequentially set to successively between second speculum and the detector image planes.The catadioptric optical imaging system it is compact-sized, be suitable for small light, good imaging quality, the optical system for being suitable as compact, the small-sized load of airborne and missile-borne, application field include it is airborne detection, missile-borne tracking etc..
Description
Technical field
The present invention relates to airborne or missile-borne optical technical field more particularly to a kind of catadioptric optical imaging systems.
Background technology
Due to infrared detection technique detection accuracy is high, strong antijamming capability and can a series of advantages such as all weather operations, make
It is used widely in the fields such as it is investigated over the ground in aviation, missile-borne detection.But in some specific uses, it usually needs light
Learning imaging system has the characteristics that image quality is high, structure size is small, mass of system is light and strong environmental adaptability.This makes again
When existing optical imaging system is applied to search at present and tracking infrared imaging system, it is vulnerable to structure size and working environment etc.
Stringent limitation.Therefore, develop a kind of infrared optics system compact-sized, quality is small, good imaging quality and environmental suitability are strong
System just becomes very necessary.
In the prior art, in relation to object lens of large relative aperture, ultra-compact catadioptric optical imaging system in terms of design, design
Thinking coordinates the mode of PASSIVE OPTICAL athermal, profit mainly using the anti-Polaroid optical system structure form of long distance is transmitted
The design without thermalization optical system is completed with different materials hot property complementation.But due to Polaroid using anti-long distance is transmitted
Structure type, itself the characteristics of determine：It dolly-out,s dolly-back than 0.8 will not be less than, system length is longer, it is difficult to meet compact, light
Small-sized requirement.
Invention content
In view of this, the present invention provides a kind of compact, small-sized catadioptric optical imaging system, it is existing for solving
There is the problem of technology.
A kind of catadioptric optical imaging system comprising：The direction of propagation in same optical axis and along light is suitable successively
The first speculum, the second speculum, positive lens and the negative lens of sequence setting, the reflecting surface of first speculum is towards described the
The central area of the reflecting surface of two-mirror, first speculum is offered for the light after being reflected by second speculum
By and reach the central through holes of detector image planes, it is anti-that the positive lens and the negative lens are sequentially set to described second successively
It penetrates between mirror and the detector image planes.
In a better embodiment of the invention, the reflecting surface of first speculum is aspherical, and focal power is just.
In a better embodiment of the invention, first speculum is made of aluminium alloy as base material.
In a better embodiment of the invention, the reflecting surface of second speculum is aspherical, and focal power is negative.
In a better embodiment of the invention, second speculum is made of micro crystal material.
In a better embodiment of the invention, the positive lens is made of Ge materials.
In a better embodiment of the invention, the negative lens is made of ZnSe materials.
In an of the invention better embodiment, first speculum, second speculum, the positive lens and described
The support element of negative lens is made of aluminum alloy materials.
In a better embodiment of the invention, the center of the detector image planes is located at the optical axis.
Compared to the prior art, catadioptric optical imaging system provided by the invention is compact-sized, it can be achieved that long drive
Than 0.42；Simultaneity factor F numbers can reach 0.69, be conducive to the collection of energy of non-refrigerated infrared detector.In addition, the present invention provides
Catadioptric optical imaging system use rational speculum and transmissive element match materials, realize from -40 DEG C~50
DEG C without thermalized design, disclosure satisfy that system works normally in large temperature range.Catadioptric optical provided by the invention
Imaging system images are high-quality, simple in structure, particularly suitable as airborne and compact, the small-sized load of missile-borne optical system,
Its application field includes airborne detection, missile-borne tracking etc..
Description of the drawings
Fig. 1 is the schematic diagram of catadioptric optical imaging system provided by the invention；
Fig. 2 is the coordinate system schematic diagram that the present invention uses；
Fig. 3 is modulation transfer function of optical system curve of the catadioptric optical imaging system at -40 DEG C shown in Fig. 1；
Fig. 4 is modulation transfer function of optical system curve of the catadioptric optical imaging system at 20 DEG C shown in Fig. 1；
Fig. 5 is modulation transfer function of optical system curve of the catadioptric optical imaging system at 50 DEG C shown in Fig. 1.
Specific implementation mode
To facilitate the understanding of the present invention, below with reference to relevant drawings to invention is more fully described.In attached drawing
Give the better embodiment of the present invention.It these are only the preferred embodiment of the present invention, be not intended to limit the special of the present invention
Sharp range, it is every using equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, directly or
It connects and is used in other related technical areas, be included within the scope of the present invention.
Unless otherwise defined, all of technologies and scientific terms used here by the article and belong to the technical field of the present invention
The normally understood meaning of technical staff is identical.Used term is intended merely to description tool in the description of the invention herein
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more
Any and all combinations of relevant Listed Items.
The present invention provides a kind of catadioptric optical imaging system comprising：Propagation in same optical axis and along light
The first speculum, the second speculum, positive lens and the negative lens that direction is sequentially arranged successively, the reflecting surface of first speculum
Towards the reflecting surface of second speculum, the central area of first speculum is offered for anti-by second speculum
Light after penetrating by and reach the central through holes of detector image planes, the positive lens and the negative lens are sequentially set to successively
Between second speculum and the detector image planes.
Referring to Fig. 1, for the schematic diagram of catadioptric optical imaging system provided by the invention, Fig. 2 is that the present invention uses
Coordinate system schematic diagram, the catadioptric optical imaging system presses xyz right hand space coordinates ordered arrangements, and z-axis direction is fixed
For optical axis direction, y-axis is illustrating in 2 planes, and for x-axis perpendicular to yz planes, yz coordinate planes are the meridian plane of optical system.It is described
Catadioptric optical imaging system includes the first speculum 1, the second speculum 2, positive lens 3 and negative lens 4, first reflection
Mirror 1, second speculum 2, the positive lens 3 and the negative lens 4 be located in same optical axis and along the direction of propagation of light according to
Secondary sequence setting；The reflecting surface of first speculum 1 is towards the reflecting surface of second speculum 2, first speculum 1
Central area offer central through hole, for for by second speculum reflect after light by and reach detector picture
Face 5 can guarantee that the light after second speculum 2 reflection can effectively reach detector image planes 5, realizes as a result,
Imaging；The positive lens 3 and the negative lens 4 be sequentially set to successively second speculum 2 and the detector image planes 5 it
Between, specifically, second speculum 2 and the positive lens 3 are oppositely arranged, and the positive lens 3 and the negative lens 4 ensure peace
It is set gradually after dress distance.
It is understood that the distance between the negative lens 4 and the detector image planes 5 are the catadioptric optical
The back work distance of imaging system.
In the present embodiment, the reflecting surface of first speculum 1 is aspherical, such as quadratic surface, first speculum
Its focal power is just.
In the present embodiment, the reflecting surface of second speculum 2 is aspherical, such as quadratic surface, second speculum
Focal power be negative.
In the present invention, the catadioptric optical imaging system in order to enable distant target to be imaged in detector image planes 5,
Coaxial catadioptric configuration is used, the focal power of first speculum 1 is just that the focal power of second speculum 2 is
Negative, the target of infinity is irradiated to second speculum 2 after first speculum 1, by second speculum 2
After be irradiated to the positive lens 3, the negative lens 4 is then refracted to by the positive lens 3, eventually passes through 4 folding of the negative lens
It is mapped in the detector image planes 5, obtains picture to the end.
In the present embodiment, the center of the detector image planes 5 is located at the optical axis.
In the present invention, preceding group of reflecting system of the catadioptric optical imaging system is (by first speculum 1 and institute
State the second speculum 2 composition) use R-C structure types, i.e., described first speculum 1 and second speculum 2 to be all made of double
Curved surface, it is advantageous that system can eliminate coma influence, for visual field with respect to Cassegrain's bigger, image quality is also relatively more preferable.It is described
Scenery is ultimately imaged described by the relay lens group (being made of positive lens 3 and negative lens 4) of catadioptric optical imaging system
Detector image planes 5, while the off-axis aberration of reflecting system is further organized before correction.In the catadioptric optical imaging system,
The 2/3 of preceding group of reflecting system sharing system focal power is conducive to system without thermalized design, and whole system size is shorter, whole remote
It penetrates than having reached 0.42, system F numbers have reached 0.69.
In the present embodiment, first speculum 1 is made of aluminium alloy as base material；Second reflection
Mirror 2 is made of micro crystal material；The positive lens 3 is made of Ge materials；The negative lens 4 uses ZnSe materials
It is made.
In the present invention, using aluminium alloy as mirror substrate material, when design, can be as needed for first speculum 1
Comprehensive process, specific heat capacity and heat expansion is optimal etc. carries out speculum thickness design.When the temperature increases, first speculum
1 radius of curvature increases, and focal power reduces；And relay lens group is when the temperature rises, infra-red material refractive index becomes larger, that is, relays
Lens group focal length shortens.Using this characteristic, in the catadioptric optical imaging system, second speculum 2 selects heat
The swollen lower micro crystal material of coefficient, the positive lens 3 select Ge, the negative lens 4 to select ZnSe.Pass through of material as a result,
With can realize system without thermalized design.
Fig. 3-5 is respectively that catadioptric optical imaging system optics system modulation at-40 DEG C, 20 DEG C and 50 DEG C passes
Delivery function curve, it is known that, the catadioptric optical imaging system may be implemented from -40 DEG C~50 DEG C without thermalized design, energy
Enough satisfactions work normally in large temperature range.
It is understood that first speculum 1, second speculum 2, the positive lens 3 and the negative lens 4
Support element (not shown) may be used and be configured fixation, it is preferable that support element is made of aluminum alloy materials.It can manage
Solution, the spacing distance between first speculum 1, second speculum 2, the positive lens 3 and the negative lens 4
It can be designed according to actual conditions.
Compared to the prior art, catadioptric optical imaging system provided by the invention is compact-sized, it can be achieved that long drive ratio
0.42；Simultaneity factor F numbers can reach 0.69, be conducive to the collection of energy of non-refrigerated infrared detector.In addition, provided by the invention
Catadioptric optical imaging system uses the match materials of rational speculum and transmissive element, realizes from -40 DEG C~50 DEG C
Without thermalized design, disclosure satisfy that system works normally in large temperature range.Catadioptric optical provided by the invention at
As system imaging is high-quality, simple in structure, particularly suitable as airborne and compact, the small-sized load of missile-borne optical system,
Application field includes airborne detection, missile-borne tracking etc..
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Cannot the limitation to the scope of the claims of the present invention therefore be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (5)
1. a kind of catadioptric optical imaging system, which is characterized in that including：The direction of propagation in same optical axis and along light
The first speculum (1), the second speculum (2), positive lens (3) and the negative lens (4) of sequence setting successively, first speculum
(1) for reflecting surface towards the reflecting surface of second speculum (2), the central area of first speculum (1) offers confession
Light after being reflected by second speculum (2) by and reach the central through holes of detector image planes (5), the positive lens
(3) it is sequentially set to successively between second speculum (2) and the detector image planes (5) with the negative lens (4)；
First speculum (1) is made of aluminium alloy as base material；
Second speculum (2) is made of micro crystal material；
The positive lens (3) is made of Ge materials；
The negative lens (4) is made of ZnSe materials.
2. catadioptric optical imaging system as described in claim 1, which is characterized in that first speculum (1) it is anti-
It is aspherical to penetrate face, and focal power is just.
3. catadioptric optical imaging system as described in claim 1, which is characterized in that second speculum (2) it is anti-
It is aspherical to penetrate face, and focal power is negative.
4. catadioptric optical imaging system as described in claim 1, which is characterized in that first speculum (1), described
The support element of second speculum (2), the positive lens (3) and the negative lens (4) is made of aluminum alloy materials.
5. catadioptric optical imaging system as described in claim 1, which is characterized in that in the detector image planes (5)
The heart is located at the optical axis.
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| CN201711174214.0A CN107807441B (en) | 2017-11-22 | 2017-11-22 | catadioptric optical imaging system |
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| CN201711174214.0A CN107807441B (en) | 2017-11-22 | 2017-11-22 | catadioptric optical imaging system |
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| CN107807441A CN107807441A (en) | 2018-03-16 |
| CN107807441B true CN107807441B (en) | 2018-08-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110146971B (en) * | 2019-05-10 | 2024-05-31 | 中国科学院西安光学精密机械研究所 | Small-sized large-field tele camera optical system for cube satellite |
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| GB2030315A (en) * | 1978-08-24 | 1980-04-02 | Pilkington Perkin Elmer Ltd | Catadioptric Infra-red Lenses |
| CA1162767A (en) * | 1980-11-10 | 1984-02-28 | Marcus R. Hatch | Field curvature control |
| JPH10206986A (en) * | 1997-01-27 | 1998-08-07 | Topcon Corp | Infrared optical device |
| RU2154849C2 (en) * | 1998-03-17 | 2000-08-20 | Конструкторско-технологический институт прикладной микроэлектроники СО РАН | Ultraviolet objective |
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| CN102540436A (en) * | 2011-12-29 | 2012-07-04 | 中国科学院长春光学精密机械与物理研究所 | Optical-compensation athermalizing long-wave infrared optical system |
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| CN103645554A (en) * | 2013-10-28 | 2014-03-19 | 中国科学院长春光学精密机械与物理研究所 | Refraction and reflection type infrared imaging system |
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| US7082001B2 (en) * | 2004-03-31 | 2006-07-25 | The United States Of America As Represented By The Secretary Of The Army | Dual mode mirror imaging system |
| US8488237B2 (en) * | 2011-01-12 | 2013-07-16 | Raytheon Company | Wide spectral coverage Ross corrected Cassegrain-like telescope |
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|---|---|---|---|---|
| GB2030315A (en) * | 1978-08-24 | 1980-04-02 | Pilkington Perkin Elmer Ltd | Catadioptric Infra-red Lenses |
| CA1162767A (en) * | 1980-11-10 | 1984-02-28 | Marcus R. Hatch | Field curvature control |
| JPH10206986A (en) * | 1997-01-27 | 1998-08-07 | Topcon Corp | Infrared optical device |
| RU2154849C2 (en) * | 1998-03-17 | 2000-08-20 | Конструкторско-технологический институт прикладной микроэлектроники СО РАН | Ultraviolet objective |
| CN2711758Y (en) * | 2004-06-22 | 2005-07-20 | 中国科学院上海技术物理研究所 | Refraction/reflection infrared optical system for push-scan imaging |
| EP1862837A1 (en) * | 2006-05-31 | 2007-12-05 | Diehl BGT Defence GmbH & Co.KG | Multi-spectral optical imaging system |
| CN102540436A (en) * | 2011-12-29 | 2012-07-04 | 中国科学院长春光学精密机械与物理研究所 | Optical-compensation athermalizing long-wave infrared optical system |
| CN102520506A (en) * | 2011-12-30 | 2012-06-27 | 中国科学院长春光学精密机械与物理研究所 | Compact catadioptric long-wave infrared athermal imaging optical system |
| CN103207452A (en) * | 2013-03-22 | 2013-07-17 | 中国科学院长春光学精密机械与物理研究所 | Two-waveband common-path and common-focal-plane imaging system |
| CN103645554A (en) * | 2013-10-28 | 2014-03-19 | 中国科学院长春光学精密机械与物理研究所 | Refraction and reflection type infrared imaging system |
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