CN214151214U - Infrared dual-band telescopic optical system, search tracking system and forward-looking infrared system - Google Patents
Infrared dual-band telescopic optical system, search tracking system and forward-looking infrared system Download PDFInfo
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- CN214151214U CN214151214U CN202022682873.9U CN202022682873U CN214151214U CN 214151214 U CN214151214 U CN 214151214U CN 202022682873 U CN202022682873 U CN 202022682873U CN 214151214 U CN214151214 U CN 214151214U
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Abstract
The utility model discloses an infrared dual-waveband telescope optical system, including objective lens group and 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 objective lens group comprises a first ocular lens (L6) and a second ocular lens (L7); the infinite target light beam is converged and imaged by the objective lens group in sequence and imaged at infinite distance by the eyepiece lens group; the first objective lens is a biconvex positive lens, the second objective lens is a meniscus negative lens with the convex surface facing the 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 the convex surface facing the image space; the first ocular lens is a meniscus positive lens with the convex surface facing the object space, and the second ocular lens is a biconcave negative lens. The utility model discloses this system simple structure all has good image quality in infrared medium/long wave.
Description
Technical Field
The utility model discloses an infrared optical system, concretely relates to infrared medium/long wave dual waveband telescope optical system.
Background
The infrared imaging system has good concealment, strong anti-interference capability and capability of identifying the disguised target 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 affairs.
However, with the development of camouflage technology and the increase of difficulty in detecting and identifying targets, infrared detection of a single wave band is difficult to meet various requirements. The detection capability of the device can be improved by detecting infrared radiation with different wavelengths, the camouflage information of the target can be effectively removed, the detection and identification capabilities and the identification rate of the target are improved, the false alarm rate is reduced, the camouflage identification capability is improved, and the volume and the weight of the system can be further reduced by the dual-waveband integrated optical system.
For a dual-band infrared optical system, the types of usable optical materials are few, chromatic aberration is difficult to correct, and two methods are generally adopted to solve the problems: 1) diffraction optics is introduced into the refraction system, and chromatic aberration is eliminated by utilizing the negative dispersion characteristic of the diffraction optical element; 2) with a reflective system, this configuration does not introduce chromatic aberration. The reflecting system has the disadvantages of complex structure, difficult adjustment and the like, and the diffraction element is difficult to process and has low diffraction efficiency.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an infrared medium/long wave dual waveband telescope optical system with good image quality.
The utility model discloses a reach the technical scheme that the purpose adopted and be:
an infrared dual-band telescopic optical system is provided, comprising an objective lens group and an eyepiece lens 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 objective lens group comprises a first ocular lens and a second ocular lens; the infinite target light beam is converged and imaged by the objective lens group in sequence and imaged at infinite distance by the eyepiece lens group;
the first objective lens is a biconvex positive lens, the second objective lens is a meniscus negative lens with the convex surface facing the 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 the convex surface facing the image space;
the first ocular lens is a meniscus positive lens with the convex surface facing the object space, and the second ocular lens is a biconcave negative lens.
According to the technical scheme, the material of the objective lens group and the ocular lens group is germanium, zinc sulfide or zinc selenide.
According to the technical scheme, the telescopic optical system comprises two germanium aspheric surfaces, the other surface of the second objective lens is a concave aspheric surface of a 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 lens is a meniscus germanium positive lens with the convex surface facing the object space, and the second ocular lens is a biconcave zinc selenide negative lens.
According to the technical scheme, the working waveband 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 utility model also provides an infrared search tracker of dual waveband, install above-mentioned technical scheme among this infrared search tracker infrared dual waveband telescope optical system.
The utility model also provides a look ahead infrared system installs above-mentioned technical scheme among this look ahead infrared system infrared two wave bands telescope optical system.
The utility model discloses the beneficial effect who produces is: the utility model discloses an infrared two wave bands telescope optical system, system simple structure realizes the chromatic aberration correction of infrared broadband through the collocation of limited infrared optical material and the rational distribution of focal power, all has good image quality in infrared/long wave, can be applicable to the infrared search tracker and the look ahead infrared system of two wave bands.
Further, the utility model discloses an infrared medium/long wave dual-waveband telescope optical system has only adopted the germanium aspheric surface, but wide application in airborne foresight infrared and reconnaissance system, armed helicopter and carrier-borne aircraft target indicating system, the fields such as early warning, fire control and short range back-leading system and target detection and pursuit of surface of water naval vessel.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural view 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 diagram of an optical system according to an embodiment of the present invention;
FIG. 4 is an MTF graph of each field of view at a wave length of 16lp/mm in an optical system according to an embodiment of the present invention;
FIG. 5 is a MTF chart of each field of view for a long wave of 16lp/mm in an optical system according to an embodiment of the present invention;
fig. 6 shows the size of the diffuse spot of each field of view of the medium wave in the optical system according to the embodiment of the present invention;
fig. 7 shows the diffuse spot size of each field of view of the long wave of the optical system according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 1, the embodiment of the utility model provides an infrared dual-waveband telescope optical system, whole system totally seven lens, include objective lens group and eyepiece group in proper order, wherein: the objective lens group comprises five lenses including 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 objective lens group comprises two lenses including a first ocular lens L6 and a second ocular lens L7. The infinite target light beam is converged and imaged by five lenses of the objective lens group in sequence and imaged at infinite distance by two lenses of the eyepiece lens group.
Furthermore, the optical lens materials are germanium, zinc sulfide and zinc selenide which are commonly used materials for an infrared dual-band optical system.
Fig. 2 is the schematic diagram of lens and lens surface of the present invention, in this embodiment, the objective lens group has five lenses, wherein 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 to the image space, 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 to the image space. The eyepiece set comprises two lenses, the first eyepiece L6 is a meniscus germanium positive lens with a convex surface facing the object, and the second eyepiece L7 is a biconcave zinc selenide negative lens.
The utility model discloses an among the infrared dual waveband telescope optical system, telescope system operating band 3.7~4.8 mu m 7.7~9.3 mu m, magnification is 6 times.
The telescope system uses two germanium aspheric surfaces, the first surface of the second objective lens L2 is a concave aspheric surface of a germanium substrate, and the second surface is a meniscus shape with a convex surface facing to an image; the first surface of the first eyepiece L6 is a meniscus shape facing the object, and the second surface is a concave aspherical surface of the germanium substrate.
The infrared dual-band telescopic optical system of the above embodiment can be applied to a dual-band infrared search and tracking system and a front-view infrared system.
For a more detailed description, specific parameters of the optical system structure of the present invention are given below: table 1 shows the structural parameters (radius of curvature, thickness, lens spacing and material) of the infrared two-band telescopic optical system. Table 2 shows aspheric data used by the system.
TABLE 1 Infrared Dual band telescopic optical system structural parameters
TABLE 2 aspherical coefficients
Fig. 3 is a two-dimensional diagram of an optical system according to an embodiment of the present invention, in which the magnification of a telescopic system composed of an objective lens group and an eyepiece lens group is 6 times, the focal length of a rear-end ideal lens is 27mm, and the combined focal length is 180 mm;
fig. 4 is an ideal modulation transfer function curve of the medium wave in the optical system of the present invention, the modulation transfer function value of each field under 16lp/mm is higher than 0.6, and the full field of the lens has better imaging quality in the medium wave infrared band;
fig. 5 is a long-wave ideal modulation transfer function curve of the optical system of the embodiment of the present invention, the modulation transfer function value of each field under 16lp/mm is higher than 0.5, and the full field of the lens has better imaging quality in the long-wave infrared band;
FIG. 6 is a diagram of a wave spot in an optical system according to an embodiment of the present invention, in which the size of the scattering spot in each field is smaller than 20 μm;
fig. 7 is a long wave spot list of the optical system of the embodiment of the present invention, and the size of the diffuse spot in each field is smaller than 22 μm.
In the design the utility model discloses an infrared two wave band telescope optical system time, will rectify the colour difference of medium wave and long wave simultaneously, should follow system focal power condition, the mesoscopic colour difference condition in the medium wave band, long wave band achromatic condition need satisfy:
system power equation:
equation of chromatic aberration within the medium wave band:
equation of chromatic aberration within long wave band:
in the formula: phi is the focal power of the optical system; phi is aiThe focal power of the ith lens; vimThe Abbe number of the ith lens material in a medium wave band; vilThe Abbe number of the ith lens material in a long wave band.
The embodiment of the utility model provides an infrared two wave band telescope optical system chooses to use infrared two wave band materials such as germanium, zinc sulfide and zinc selenide, and the chromatic aberration of infrared broadband is rectified through the rational distribution of high low dispersion material collocation and focal power, has used two germanium aspheric surfaces simultaneously, and the contradiction between balanced chromatic aberration correction and monochromatic aberration correction. The working waveband of the telescopic system is 3.7-4.8 mu m/7.7-9.3 mu m, the magnification is 6 times, the system is simple in structure, has good imaging quality in infrared medium/long waves, and can be suitable for a dual-waveband infrared search tracking system and a forward-looking infrared system.
The infrared optical materials are few, and the performance difference of some materials in two wave bands is large (for example, germanium shows low dispersion in long-wave infrared and high dispersion in medium-wave infrared), how to select a proper optical material and correct the chromatic aberration of two wave bands simultaneously is a difficulty in designing an infrared dual-wave band optical system.
To sum up, the utility model discloses an infrared two wave bands optical system that telescope through reasonable material collocation to and use the germanium aspheric surface of easily processing, make the aberration obtain good correction. The system has the advantages that the system has seven lenses including five lenses of the objective lens group and two lenses of the eyepiece lens group, the structure is simple, and good imaging quality is achieved in the infrared dual-waveband.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (7)
1. An infrared dual-band telescopic optical system, 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 objective lens group comprises a first ocular lens (L6) and a second ocular lens (L7); the infinite target light beam is converged and imaged by the objective lens group in sequence and imaged at infinite distance by the eyepiece lens group;
the first objective lens is a biconvex positive lens, the second objective lens is a meniscus negative lens with the convex surface facing the 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 the convex surface facing the image space;
the first ocular lens is a meniscus positive lens with the convex surface facing the object space, and the second ocular lens 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 ocular lens group is germanium, zinc sulfide or zinc selenide.
3. The infrared two-band telescopic optical system of claim 1, wherein the telescopic optical system includes two germanium aspheric surfaces, the other surface of the second objective lens is a concave aspheric surface of a germanium base, and the other surface of the first eyepiece lens is a concave aspheric surface of a germanium base.
4. The infrared two-band telescopic optical system of 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 the convex surface facing the image, 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;
the first ocular lens is a meniscus germanium positive lens with the convex surface facing the object space, and the second ocular lens is a biconcave zinc selenide negative lens.
5. The infrared dual-band telescopic optical system of 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 and tracking system, wherein the infrared search and tracking system incorporates the infrared dual-band telescopic optical system of claim 1.
7. A front-view infrared system characterized in that the infrared two-band telescopic optical system of claim 1 is installed in the front-view infrared system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022682873.9U CN214151214U (en) | 2020-11-18 | 2020-11-18 | Infrared dual-band telescopic optical system, search tracking system and forward-looking infrared system |
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| CN202022682873.9U CN214151214U (en) | 2020-11-18 | 2020-11-18 | Infrared dual-band telescopic optical system, search tracking system and forward-looking infrared system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112305721A (en) * | 2020-11-18 | 2021-02-02 | 湖北久之洋红外系统股份有限公司 | Infrared dual-waveband telescopic optical system |
| CN116893503A (en) * | 2023-09-11 | 2023-10-17 | 昆明明汇光学有限公司 | Optical system of target observation mirror |
-
2020
- 2020-11-18 CN CN202022682873.9U patent/CN214151214U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112305721A (en) * | 2020-11-18 | 2021-02-02 | 湖北久之洋红外系统股份有限公司 | Infrared dual-waveband telescopic optical system |
| CN112305721B (en) * | 2020-11-18 | 2023-08-15 | 湖北久之洋红外系统股份有限公司 | Infrared dual-band telescopic optical system |
| CN116893503A (en) * | 2023-09-11 | 2023-10-17 | 昆明明汇光学有限公司 | Optical system of target observation mirror |
| 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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