CN112305721B - Infrared dual-band telescopic optical system - Google Patents
Infrared dual-band telescopic optical system Download PDFInfo
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- CN112305721B CN112305721B CN202011295368.7A CN202011295368A CN112305721B CN 112305721 B CN112305721 B CN 112305721B CN 202011295368 A CN202011295368 A CN 202011295368A CN 112305721 B CN112305721 B CN 112305721B
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- lens
- objective lens
- infrared
- optical system
- eyepiece
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- 230000003287 optical effect Effects 0.000 title claims abstract description 56
- 230000005499 meniscus Effects 0.000 claims abstract description 20
- 229910052732 germanium Inorganic materials 0.000 claims description 26
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 14
- PFNQVRZLDWYSCW-UHFFFAOYSA-N (fluoren-9-ylideneamino) n-naphthalen-1-ylcarbamate Chemical compound C12=CC=CC=C2C2=CC=CC=C2C1=NOC(=O)NC1=CC=CC2=CC=CC=C12 PFNQVRZLDWYSCW-UHFFFAOYSA-N 0.000 claims description 10
- 239000005083 Zinc sulfide Substances 0.000 claims description 10
- 229910052984 zinc sulfide Inorganic materials 0.000 claims description 10
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 6
- 230000009977 dual effect Effects 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 abstract description 7
- 230000004075 alteration Effects 0.000 description 10
- 238000012937 correction Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000003331 infrared imaging Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004297 night vision Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/02—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of crystals, e.g. rock-salt, semi-conductors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/001—Eyepieces
Abstract
The invention discloses an infrared dual-band telescopic optical system, which comprises an objective lens group and an eyepiece group, wherein: the objective lens group comprises a first objective lens (L1), a second objective lens (L2), a third objective lens (L3), a fourth objective lens (L4) and a fifth objective lens (L5), and the eyepiece lens group comprises a first eyepiece lens (L6) and a second eyepiece lens (L7); the object beam of infinity is focused and imaged by the objective lens group in sequence, and then imaged at infinity by the eyepiece group; the first objective lens is a biconvex positive lens, the second objective lens is a meniscus negative lens with a convex surface facing an image space, the third objective lens is a biconcave negative lens, the fourth objective lens is a biconcave negative lens, and the fifth objective lens is a meniscus positive lens with a convex surface facing the image space; the first ocular is a meniscus positive lens with a convex surface facing the object space, and the second ocular is a biconcave negative lens. The system has simple structure and good imaging quality in infrared medium/long wave.
Description
Technical Field
The invention discloses an infrared optical system, and particularly relates to an infrared medium/long wave dual-band telescopic optical system.
Background
The infrared imaging system has good concealment, strong anti-interference capability and capability of identifying camouflage targets to a certain extent, so that the infrared imaging system is widely applied to the fields of infrared night vision, infrared reconnaissance, infrared guidance and the like in military.
However, with the development of camouflage technology, the difficulty of reconnaissance and identification of targets is increased, and infrared detection in a single wave band is difficult to meet various requirements. The detection capability of the equipment can be improved by detecting infrared radiation with different wavelengths, camouflage information of the target can be effectively removed, the detection and recognition capability of the target can be improved, the recognition rate can be increased, the false alarm rate can be reduced, the camouflage recognition capability can be improved, and the volume and weight of the system can be further reduced by the dual-band integrated optical system.
For a dual-band infrared optical system, the types of available optical materials are few, chromatic aberration is difficult to correct, and two methods are generally adopted to solve the problems: 1) Introducing diffraction optics into a refraction system, and eliminating chromatic aberration by utilizing negative dispersion characteristics of a diffraction optical element; 2) With a reflective system, this configuration does not introduce chromatic aberration. The reflection type system has the disadvantages of complex structure, difficult assembly and adjustment, difficult processing of diffraction elements and low diffraction efficiency.
Disclosure of Invention
The invention aims to provide an infrared medium/long wave dual-band telescope optical system with good imaging quality.
The technical scheme adopted by the invention for achieving the purpose is as follows:
an infrared dual-band telescopic optical system is provided, including objective group and eyepiece group, wherein: the objective lens group comprises a first objective lens, a second objective lens, a third objective lens, a fourth objective lens and a fifth objective lens, and the eyepiece lens group comprises a first eyepiece and a second eyepiece; the object beam of infinity is focused and imaged by the objective lens group in sequence, and then imaged at infinity by the eyepiece group;
the first objective lens is a biconvex positive lens, the second objective lens is a meniscus negative lens with a convex surface facing an image space, the third objective lens is a biconcave negative lens, the fourth objective lens is a biconcave negative lens, and the fifth objective lens is a meniscus positive lens with a convex surface facing the image space;
the first ocular is a meniscus positive lens with a convex surface facing the object space, and the second ocular is a biconcave negative lens.
According to the technical scheme, the objective lens group and the eyepiece lens group are made of germanium, zinc sulfide or zinc selenide.
With the technical scheme, the telescope optical system comprises two germanium aspheric surfaces, the other surface of the second objective lens is a concave aspheric surface of the germanium substrate, and the other surface of the first eyepiece lens is a concave aspheric surface of the germanium substrate.
According to the technical scheme, the first objective lens is a biconvex zinc sulfide positive lens, the second objective lens is a meniscus germanium negative lens with the convex surface facing the image space, the third objective lens is a biconcave zinc selenide negative lens, the fourth objective lens is a biconcave zinc sulfide negative lens, and the fifth objective lens is a meniscus germanium positive lens with the convex surface facing the image space;
the first ocular is a meniscus germanium positive lens with a convex surface facing the object space, and the second ocular is a biconcave zinc selenide negative lens.
By adopting the technical scheme, the working wave band of the telescopic optical system is 3.7-4.8 mu m/7.7-9.3 mu m, and the magnification is 6 times.
The invention also provides a dual-band infrared searching and tracking system, wherein the infrared dual-band telescopic optical system is arranged in the infrared searching and tracking system.
The invention also provides a forward-looking infrared system, wherein the infrared dual-band telescopic optical system according to the technical scheme is arranged in the forward-looking infrared system.
The invention has the beneficial effects that: the infrared dual-band telescopic optical system is simple in system structure, achieves infrared broadband chromatic aberration correction through limited infrared optical material collocation and reasonable distribution of focal power, has good imaging quality in infrared medium/long waves, and can be suitable for a dual-band infrared searching and tracking system and a front-view infrared system.
Furthermore, the infrared medium/long wave double-band telescope optical system only adopts the germanium aspheric surface, and can be widely applied to the fields of airborne front-view infrared and reconnaissance systems, armed helicopters and carrier-based aircraft target indication systems, water surface ship early warning, fire control and short-range back-guiding systems, target detection and tracking and the like.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of an infrared dual-band telescopic optical system according to an embodiment of the present invention;
FIG. 2 is a schematic view of a lens and a lens surface according to an embodiment of the present invention;
FIG. 3 is a two-dimensional view of an optical system according to an embodiment of the present invention;
FIG. 4 is a graph showing MTF of each field of view at a wave of 16lp/mm in an optical system according to an embodiment of the present invention;
FIG. 5 is a graph showing MTF of each field of view at a long wavelength of 16lp/mm for an optical system in accordance with an embodiment of the present invention;
FIG. 6 shows the size of the speckle of each field of view of a wave in an optical system according to an embodiment of the invention;
FIG. 7 shows the size of the speckle size for each field of view of the long wave of the optical system according to the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, in the infrared dual-band telescopic optical system according to the embodiment of the present invention, the entire system includes seven lenses, in order, an objective lens group and an eyepiece lens group, wherein: the objective lens group comprises five lenses of a first objective lens L1, a second objective lens L2, a third objective lens L3, a fourth objective lens L4 and a fifth objective lens L5, and the eyepiece lens group comprises two lenses of a first eyepiece lens L6 and a second eyepiece lens L7. The object beam of infinity is focused and imaged by five lenses of the objective lens group in sequence, and then imaged at infinity by two lenses of the eyepiece lens group.
Furthermore, the optical lens materials are germanium, zinc sulfide and zinc selenide which are materials commonly used in an infrared dual-band optical system.
Fig. 2 is a schematic diagram of a lens and a lens surface of the present invention, in which the objective lens group includes five lenses, the first objective lens L1 is a biconvex zinc sulfide positive lens, the second objective lens L2 is a meniscus germanium negative lens with a convex surface facing the image side, the third objective lens L3 is a biconcave zinc selenide negative lens, the fourth objective lens L4 is a biconcave zinc sulfide negative lens, and the fifth objective lens L5 is a meniscus germanium positive lens with a convex surface facing the image side. The ocular lens group comprises two lenses, the first ocular lens L6 is a meniscus germanium positive lens with a convex surface facing the object space, and the second ocular lens L7 is a biconcave zinc selenide negative lens.
In the infrared dual-band telescopic optical system, the working band of the telescopic system is 3.7-4.8 mu m/7.7-9.3 mu m, and the magnification is 6 times.
The telescopic system uses two germanium aspheric surfaces, a first surface of a second objective L2 is a concave aspheric surface of a germanium substrate, and a second surface is a meniscus with a convex surface facing an image space; the first surface of the first eyepiece L6 is a meniscus shape facing the object, and the second surface is a concave aspheric surface of the germanium substrate.
The infrared dual-band telescopic optical system of the embodiment can be applied to a dual-band infrared searching and tracking system and a forward-looking infrared system.
For a more detailed description, specific parameters of the structure of the optical system of the present invention are given below: table 1 shows the structural parameters (lens radius of curvature, thickness, lens spacing and materials) of the infrared dual band telescopic optical system. Table 2 shows aspherical data used by the system.
TABLE 1 structural parameters of infrared dual-wave Duan Wang high beam optical system
Table 2 aspherical coefficients
FIG. 3 is a two-dimensional view of an optical system according to an embodiment of the present invention, wherein the magnification of a telescopic system comprising an objective lens group and an eyepiece lens group is 6 times, the focal length of an ideal lens is 27mm, and the combined focal length is 180mm;
FIG. 4 is a graph of the ideal modulation transfer function of the medium wave in the optical system according to the embodiment of the invention, the modulation transfer function value of each view field is higher than 0.6 at 16lp/mm, and the full view field of the lens has better imaging quality in the medium wave infrared band;
FIG. 5 is a graph of a long-wave ideal modulation transfer function of an optical system according to an embodiment of the present invention, wherein the modulation transfer function value of each field of view is higher than 0.5 at 16lp/mm, and the full field of view of the lens has good imaging quality in the long-wave infrared band;
FIG. 6 is a wave point array diagram of an optical system according to an embodiment of the present invention, wherein the size of a diffuse spot of each field of view is smaller than 20 μm;
FIG. 7 is a diagram of a long-wave point of an optical system according to an embodiment of the present invention, wherein the size of a diffuse spot in each field of view is smaller than 22 μm; .
When the infrared dual-band telescopic optical system is designed, chromatic aberration of medium wave and long wave is corrected at the same time, the system focal power condition, the achromatism condition in the medium wave band and the achromatism condition in the long wave band are required to be satisfied:
system power equation:
achromatism equation in the medium wave band:
achromatism equation in the long wave band:
wherein: phi is the optical power of the optical system; phi (phi) i The optical power of the ith lens; v (V) im Abbe number of the ith lens material in the mid-wave band; v (V) il Is the abbe number of the ith lens material in the long wavelength band.
According to the infrared dual-band telescopic optical system provided by the embodiment of the invention, infrared dual-band materials such as germanium, zinc sulfide and zinc selenide are selected, infrared broadband chromatic aberration correction is realized through high-low dispersion material collocation and reasonable distribution of optical power, and meanwhile, two germanium aspheric surfaces are used to balance the contradiction between chromatic aberration correction and monochromatic aberration correction. The telescope system has the working wave band of 3.7-4.8 mu m/7.7-9.3 mu m and the magnification of 6 times, has simple structure and good imaging quality in infrared medium/long wave, and can be suitable for an infrared searching and tracking system and a forward-looking infrared system with double wave bands.
The infrared optical materials are relatively few, and the performance of some materials in two wave bands is very different (for example, germanium shows low dispersion in long-wave infrared and high dispersion in medium-wave infrared), so how to select proper optical materials and correct chromatic aberration of two wave bands is a difficulty in designing an infrared two-wave band optical system.
In summary, the infrared dual-band telescopic optical system of the invention can well correct aberration through reasonable material collocation and the use of the easy-to-process germanium aspheric surface. The system objective lens group comprises five lenses and two lenses of the eyepiece lens group, seven lenses are adopted, the structure is simple, and the imaging quality is good in infrared double wave bands.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (7)
1. An infrared dual-band telescopic optical system, which is characterized by comprising an objective lens group and an eyepiece lens group, wherein: the objective lens group comprises a first objective lens (L1), a second objective lens (L2), a third objective lens (L3), a fourth objective lens (L4) and a fifth objective lens (L5), and the eyepiece lens group comprises a first eyepiece lens (L6) and a second eyepiece lens (L7); the object beam of infinity is focused and imaged by the objective lens group in sequence, and then imaged at infinity by the eyepiece group;
the first objective lens is a biconvex positive lens, the second objective lens is a meniscus negative lens with a convex surface facing an image space, the third objective lens is a biconcave negative lens, the fourth objective lens is a biconcave negative lens, and the fifth objective lens is a meniscus positive lens with a convex surface facing the image space;
the first ocular is a meniscus positive lens with a convex surface facing the object space, and the second ocular is a biconcave negative lens.
2. The infrared dual band telescopic optical system of claim 1, wherein the material of the objective lens group and the eyepiece group is germanium, zinc sulfide or zinc selenide.
3. The infrared dual-band telescopic optical system according to claim 1, wherein the telescopic optical system comprises two germanium aspherical surfaces, the other surface of the second objective lens is a concave aspherical surface of a germanium substrate, and the other surface of the first eyepiece lens is a concave aspherical surface of a germanium substrate.
4. The infrared dual-band telescopic optical system according to claim 1 or 3, wherein the first objective lens is a biconvex zinc sulfide positive lens, the second objective lens is a meniscus germanium negative lens with a convex surface facing the image side, the third objective lens is a biconcave zinc selenide negative lens, the fourth objective lens is a biconcave zinc sulfide negative lens, and the fifth objective lens is a meniscus germanium positive lens with a convex surface facing the image side;
the first ocular is a meniscus germanium positive lens with a convex surface facing the object space, and the second ocular is a biconcave zinc selenide negative lens.
5. The infrared dual-band telescopic optical system according to claim 1, wherein the working band of the telescopic optical system is 3.7-4.8 μm/7.7-9.3 μm, and the magnification is 6 times.
6. A dual-band infrared search tracking system, wherein the infrared search tracking system is provided with the infrared dual-band telescopic optical system as claimed in claim 1.
7. A forward-looking infrared system, wherein the infrared dual-band telescopic optical system according to claim 1 is installed in the forward-looking infrared system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011295368.7A CN112305721B (en) | 2020-11-18 | 2020-11-18 | Infrared dual-band telescopic optical system |
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| CN202011295368.7A CN112305721B (en) | 2020-11-18 | 2020-11-18 | Infrared dual-band telescopic optical system |
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| CN112305721B true CN112305721B (en) | 2023-08-15 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114089511B (en) * | 2021-11-26 | 2024-01-16 | 湖北久之洋红外系统股份有限公司 | Very wide band transmission type telescopic optical system |
| CN114200662A (en) * | 2021-12-21 | 2022-03-18 | 湖南华南光电(集团)有限责任公司 | Athermal infrared collimator optical system |
| CN116893503B (en) * | 2023-09-11 | 2023-11-24 | 昆明明汇光学有限公司 | Optical system of target observation mirror |
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| CN214151214U (en) * | 2020-11-18 | 2021-09-07 | 湖北久之洋红外系统股份有限公司 | Infrared dual-band telescopic optical system, search tracking system and forward-looking infrared system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI264561B (en) * | 2005-04-01 | 2006-10-21 | Asia Optical Co Inc | Telescope optical system |
| TWI317820B (en) * | 2006-11-15 | 2009-12-01 | Asia Optical Co Inc | Zoom lens |
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| US6091551A (en) * | 1997-01-30 | 2000-07-18 | Fuji Photo Optical Co., Ltd. | Infrared zoom lens system |
| CN1410793A (en) * | 2001-09-28 | 2003-04-16 | 佳能株式会社 | Focal length extending lens and camera with same |
| JP2004126395A (en) * | 2002-10-04 | 2004-04-22 | Nikon Corp | Telescopic optical system and objective system used for the same |
| JP2007199336A (en) * | 2006-01-26 | 2007-08-09 | Deon Kogaku Giken:Kk | Variable power optical system for ground telescope |
| CN103926680A (en) * | 2014-04-08 | 2014-07-16 | 中国科学院空间科学与应用研究中心 | Long-focus optical system with image space telecentric lenses |
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