CN112180571A - A common aperture infrared dual-band dual-field optical system - Google Patents
A common aperture infrared dual-band dual-field optical system Download PDFInfo
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- 230000003287 optical effect Effects 0.000 title claims abstract description 91
- 230000005499 meniscus Effects 0.000 claims abstract description 37
- 229910052732 germanium Inorganic materials 0.000 claims description 14
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 239000010703 silicon Substances 0.000 claims description 11
- 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
- 239000005387 chalcogenide glass Substances 0.000 claims description 8
- 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 3
- 239000000463 material Substances 0.000 claims 1
- 238000003384 imaging method Methods 0.000 abstract description 17
- 238000001514 detection method Methods 0.000 abstract description 11
- 230000004075 alteration Effects 0.000 description 11
- 238000005452 bending Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005855 radiation Effects 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/02—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective
- G02B15/10—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective by adding a part, e.g. close-up attachment
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- 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
- G02B15/144—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 having four groups only
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- 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
- G02B15/145—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 having five groups only
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Abstract
本发明提供了一种共孔径红外双波段双视场光学系统，解决现有多波段红外探测采用多个独立红外波段成像系统，导致整体成像系统结构复杂、体积大的问题。该系统包括前固定组、变倍组、后固定组、投影镜组，投影镜组包括可互相切换的长波投影镜组和中波投影镜组；前固定组包括一个正光焦度弯向像方的弯月透镜、一个负光焦度弯向像方的弯月透镜；变倍组为一个负光焦度双凹的第三透镜；后固定组包括一个正光焦度双凸透镜、一个负光焦度弯向物方的弯月透镜、一个正光焦度弯向像方的弯月透镜、一个负光焦度弯向像方的弯月透镜，长波投影镜组包括4个透镜，中波投影镜组包括4个透镜，第三透镜是可沿光轴方向前后移动，实现两档双视场变焦的透镜。
The invention provides a common aperture infrared dual-band dual-field optical system, which solves the problems that the existing multi-band infrared detection adopts multiple independent infrared-band imaging systems, resulting in complex structure and large volume of the overall imaging system. The system includes a front fixed group, a variable magnification group, a rear fixed group, and a projection lens group. The projection lens group includes a long-wave projection lens group and a medium-wave projection lens group that can be switched with each other; A meniscus lens with a negative refractive power, a meniscus lens with a negative refractive power bent to the image side; the zoom group is a third lens with a negative refractive power biconcave; the rear fixed group includes a positive refractive power biconvex lens and a negative refractive power. A meniscus lens with a degree of curvature to the object side, a meniscus lens with a positive refractive power curved to the image side, a meniscus lens with a negative refractive power curved to the image side, the long-wave projection lens group includes 4 lenses, the medium-wave projection lens The group includes 4 lenses, and the third lens is a lens that can move forward and backward along the optical axis to achieve two-speed dual-field zoom.
Description
Technical Field
The invention relates to an infrared optical system, in particular to a common-aperture infrared dual-waveband dual-field-of-view optical system.
Background
In a modern detection system, infrared search tracking equipment is widely applied, but due to different used regional climates, change of external environment temperature, camouflage of a target and the like, information acquired by a single-waveband detection system is insufficient, so that the target cannot be detected by the detection system or the detection accuracy is reduced, and the target cannot be detected and identified by the equipment under a complex background.
Therefore, multiband infrared detection comparison and image compounding are carried out on the target according to the radiation and reflection characteristics of the target and the background, and the target becomes a hot spot in the infrared optical field. By utilizing the spectrums of different wavelength ranges of the infrared wave bands, the disguised information of the target can be effectively removed, the detection and identification capability and the identification rate of the target are improved, and the false alarm rate of the system is reduced. However, in the prior art, in order to implement multiband infrared detection, a plurality of imaging systems with independent infrared bands are usually designed, and although the detection requirements can be met, the defects of complex structure and large volume of the whole system are inevitably brought.
Disclosure of Invention
The invention provides a common-aperture infrared dual-waveband dual-field-of-view optical system, aiming at solving the technical problems of complex structure and large volume of the whole imaging system caused by the adoption of a plurality of independent infrared waveband imaging systems in the existing multiband infrared detection.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a common-aperture infrared dual-waveband dual-field-of-view optical system is characterized in that: the system comprises a front fixed group, a zoom group, a rear fixed group and a projection lens group which are sequentially arranged from an object side to an image side, wherein the projection lens group comprises a long-wave projection lens group and a medium-wave projection lens group which can be switched with each other;
the front fixed group comprises a first lens and a second lens which are sequentially arranged along an optical axis, the first lens is a meniscus lens with positive focal power bending to the image side, and the second lens is a meniscus lens with negative focal power bending to the image side;
the zoom group is a third lens, and the third lens is a negative focal power biconcave lens;
the rear fixed group comprises a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged along an optical axis, wherein the fourth lens is a positive focal power double convex lens, the fifth lens is a meniscus lens with negative focal power bent to an object side, the sixth lens is a meniscus lens with positive focal power bent to an image side, and the seventh lens is a meniscus lens with negative focal power bent to the image side;
the long-wave projection lens group comprises an eighth lens, a ninth lens, a tenth lens, an eleventh lens and a twelfth lens which are sequentially arranged along an optical axis, wherein the eighth lens is a negative focal power biconcave lens, the ninth lens is a meniscus lens with positive focal power bent to an object space, the tenth lens is a meniscus lens with positive focal power bent to an image space, the eleventh lens is a meniscus lens with negative focal power bent to the image space, and the twelfth lens is a positive focal power biconvex lens;
the medium wave projection lens group comprises a thirteenth lens, a fourteenth lens, a fifteenth lens, a sixteenth lens and a seventeenth lens which are sequentially arranged along an optical axis, wherein the thirteenth lens is a meniscus lens with positive focal power bent to the object side, the fourteenth lens is a meniscus lens with positive focal power bent to the image side, the fifteenth lens is a negative focal power biconcave lens, the sixteenth lens is a meniscus lens with positive focal power bent to the image side, and the seventeenth lens is a positive focal power biconvex lens;
the third lens can move back and forth along the direction of an optical axis to realize two-gear double-field zooming, and moves towards one side of an image space when changing towards the telephoto direction; in the change to the short focus, the third lens moves toward the object plane side.
Further, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, the thirteenth lens, the fourteenth lens, the fifteenth lens, the sixteenth lens, and the seventeenth lens are made of chalcogenide glass, zinc sulfide, germanium, chalcogenide glass, zinc sulfide, germanium, zinc selenide, germanium, silicon, germanium, silicon, and silicon, respectively.
Further, the interval between the third lens and the fourth lens ranges from 2.56mm to 89.82 mm.
Further, a surface close to the object side is defined as a front surface, and a surface close to the image side is defined as a rear surface;
the thickness of the first lens is 24mm, the front surface of the first lens is a spherical surface, and the curvature radius is 217.24; the rear surface is spherical with a curvature radius of 800.17;
the thickness of the second lens is 17.77mm, the front surface of the second lens is spherical, and the curvature radius is 1744.17; the posterior surface is spherical with a radius of curvature of 279.83.
Further, the third lens has a thickness of 11.34mm, an aspherical front surface, a radius of curvature of-1028.68, and an aspherical surface coefficient a of-7.11 × 10-8，B＝3.14×10-11，C＝-3.10×10-15；
The rear surface is aspherical with a radius of curvature of 586.17 and an aspherical coefficient a of-6.30 × 10-8，B＝3.13×10-11，C＝-3.05×10-15。
Further, the thickness of the fourth lens is 12.95mm, the front surface of the fourth lens is a spherical surface, and the curvature radius is-7472.79; the rear surface is spherical, and the curvature radius is-130.80;
the thickness of the fifth lens is 9mm, the front surface of the fifth lens is a spherical surface, and the curvature radius of the fifth lens is-120.62; the rear surface is spherical, and the curvature radius is-577.85;
the thickness of the sixth lens is 10mm, the front surface of the sixth lens is a spherical surface, and the curvature radius is 231.10; the rear surface is spherical with a curvature radius of 1156.55;
the thickness of the seventh lens is 17mm, the front surface of the seventh lens is a spherical surface, and the curvature radius of the seventh lens is 38.91; the rear surface is spherical, and the curvature radius is 24.48;
further, the thickness of the eighth lens is 4mm, the front surface of the eighth lens is a spherical surface, and the curvature radius of the eighth lens is-563.31; the rear surface is spherical with a curvature radius of 114.06;
the thickness of the ninth lens is 5.35mm, the front surface of the ninth lens is a spherical surface, and the curvature radius of the ninth lens is 554.31; the rear surface is spherical, and the curvature radius is-125.81;
the thickness of the tenth lens is 7.67mm, the front surface of the tenth lens is a spherical surface, and the curvature radius of the tenth lens is 25.62; the rear surface is spherical with a curvature radius of 58.94;
the thickness of the eleventh lens is 6.01mm, the front surface of the eleventh lens is a spherical surface, and the curvature radius of the eleventh lens is 398.76; the rear surface is spherical with a curvature radius of 37.88;
the thickness of the twelfth lens is 9mm, the front surface of the twelfth lens is a spherical surface, and the curvature radius of the twelfth lens is 120.25; the rear surface is spherical, and the curvature radius is-114.61;
further, the thickness of the thirteenth lens is 15mm, the front surface of the thirteenth lens is a spherical surface, and the curvature radius is-66.36; the rear surface is spherical, and the curvature radius is-57.15;
the thickness of the fourteenth lens is 3.84mm, the front surface of the fourteenth lens is a spherical surface, and the curvature radius of the fourteenth lens is 44.98; the rear surface is spherical with a curvature radius of 168.61;
the thickness of the fifteenth lens is 4.05mm, the front surface of the fifteenth lens is a spherical surface, and the curvature radius is-67.71; the rear surface is spherical with a curvature radius of 168.51;
the thickness of the sixteenth lens is 2.87mm, the front surface of the sixteenth lens is a spherical surface, and the curvature radius is 31.66; the rear surface is spherical with a curvature radius of 23.68;
the thickness of the seventeenth lens is 9.87mm, the front surface of the seventeenth lens is a spherical surface, and the curvature radius is 65.36; the posterior surface is spherical with a radius of curvature of-74.56.
Further, when the long-wave projection lens group is positioned on an emergent light path of the rear fixed group, the front fixed group, the third lens, the rear fixed group and the long-wave projection lens group form a long-wave infrared optical system;
when the medium wave projection lens group is positioned on an emergent light path of the rear fixed group, the front fixed group, the third lens, the rear fixed group and the medium wave projection lens group form a medium wave infrared optical system;
the parameters of the long-wave infrared optical system and the medium-wave infrared optical system are two grades of 185mm/370mm focal length, the relative aperture 1/2 is 2.97 degrees multiplied by 2.38 degrees/1.49 degrees multiplied by 1.19 degrees in field of view.
Compared with the prior art, the invention has the advantages that:
the dual-waveband double-field optical system comprises a front fixed group, a zoom group, a rear fixed group, a long-wave projection lens group and a medium-wave projection lens group, and the transformation of two wavebands of the system can be realized by switching the long-wave projection lens group or the medium-wave projection lens group in the whole group; when the long-wave projection lens group is cut into the emergent light path of the rear fixed group, the front fixed group, the zoom group, the rear fixed group and the long-wave projection lens group form a long-wave infrared optical system; when the medium wave projection lens group is cut into an emergent light path of the rear fixed group, the front fixed group, the zoom group, the rear fixed group and the medium wave projection lens group form a medium wave infrared optical system, and different wave bands can be selected to detect a target according to the radiation characteristic of the target; the zoom group can realize two-stage zoom of the focal length of the long-wave infrared/medium-wave infrared optical system by axially moving the zoom group, and the zoom group is a single lens, so that the structure is simple, the control requirement is low, and the high imaging quality of the system is easily ensured.
Drawings
FIG. 1 is a diagram of an optical path of a long-wave infrared short-focus 185mm optical system in a common-aperture infrared two-waveband dual-field-of-view optical system according to the present invention;
FIG. 2 is a diagram of the optical path of a long-wave infrared long-focus 370mm optical system in the common-aperture infrared two-waveband two-field optical system of the present invention;
FIG. 3 is a diagram of the optical path of a medium wave infrared short focus 185mm optical system in the common-aperture infrared two-waveband dual-field-of-view optical system of the present invention;
FIG. 4 is a diagram of the optical path of a medium wave infrared long focus 370mm optical system in the common-aperture infrared two-band dual-field optical system of the present invention;
FIG. 5 is a graph of MTF for a long-wave infrared short-focus 185mm optical system at a spatial frequency of 33 lp/mm;
FIG. 6 is a graph of MTF for a long-wavelength infrared tele 370mm optical system at a spatial frequency of 33 lp/mm;
FIG. 7 is a graph of MTF for a medium-wave infrared short-focus 185mm optical system with a spatial frequency of 33 lp/mm;
FIG. 8 is a graph of MTF for a medium-wavelength infrared 370mm long-focus optical system with a spatial frequency of 33 lp/mm;
FIG. 9 is a plot of spherical aberration, field curvature and distortion for a long wave infrared short focus 185mm optical system;
FIG. 10 is a plot of spherical aberration, field curvature and distortion for a long wave IR tele 370mm optical system;
FIG. 11 is a plot of spherical aberration, field curvature and distortion for a medium wave infrared short focus 185mm optical system;
FIG. 12 is a plot of spherical aberration, field curvature and distortion for a medium wave infrared tele 370mm optical system;
wherein the reference numbers are as follows:
01-front fixed group, 02-rear fixed group, 03-long wave projection lens group, 04-medium wave projection lens group;
1-first lens, 2-second lens, 3-third lens, 4-fourth lens, 5-fifth lens, 6-sixth lens, 7-seventh lens, 8-eighth lens, 9-ninth lens, 10-tenth lens, 11-eleventh lens, 12-twelfth lens, 13-thirteenth lens, 14-fourteenth lens, 15-fifteenth lens, 16-sixteenth lens, 17-seventeenth lens.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
As shown in fig. 1 to 4, a common-aperture infrared dual-band dual-field optical system includes a front fixed group 01, a zoom group, a rear fixed group 02, and a projection lens group, which are sequentially arranged from an object side to an image side, wherein the projection lens group includes a long-wave projection lens group 03 and a medium-wave projection lens group 04, and the conversion of two bands of the system can be realized by switching the long-wave projection lens group 03 or the medium-wave projection lens group 04 in the whole group; when the long-wave projection lens group 03 is cut into an emergent light path of the rear fixed group 02, the front fixed group 01, the zoom group, the rear fixed group 02 and the long-wave projection lens group 03 which are coaxially arranged form a long-wave infrared optical system; when the medium wave projection lens group 04 is cut into the emergent light path of the rear fixed group 02, the front fixed group 01, the zoom group, the rear fixed group 02 and the medium wave projection lens group 04 which are coaxially arranged form a medium wave infrared optical system; the dual-waveband dual-field-of-view optical system can select different wavebands (long-wave infrared or medium-wave infrared) to detect the target according to different target radiation characteristics; the long-wave infrared optical system and the medium-wave infrared optical system can realize the two-gear zoom of 185mm/370mm focal length by axially moving the zoom group.
The front fixed group 01 consists of 2 lenses, namely a first lens 1 and a second lens 2 which are coaxially arranged along an optical axis in sequence, wherein the first lens 1 is a meniscus chalcogenide glass lens with positive focal power bent to an image side, and the second lens 2 is a meniscus zinc sulfide lens with negative focal power bent to the image side;
the zoom group consists of 1 lens, and is a third lens 3, and the third lens 3 is a negative focal power biconcave germanium lens;
the rear fixed group 02 is composed of 4 lenses, namely a fourth lens 4, a fifth lens 5, a sixth lens 6 and a seventh lens 7 which are coaxially arranged along an optical axis in sequence, wherein the fourth lens 4 is a positive focal power double-convex chalcogenide glass lens, the fifth lens 5 is a meniscus zinc sulfide lens with negative focal power bent to an object direction, the sixth lens 6 is a chalcogenide glass lens with positive focal power bent to an image direction, and the seventh lens 7 is a meniscus zinc sulfide lens with negative focal power bent to the image direction;
the long-wave projection lens group 03 consists of 5 lenses, namely an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11 and a twelfth lens 12 which are coaxially arranged along an optical axis in sequence, wherein the eighth lens 8 is a negative focal power biconcave zinc sulfide lens, the ninth lens 9 is a positive focal power meniscus germanium lens which is bent to an object direction, the tenth lens 10 is a positive focal power meniscus zinc selenide lens which is bent to an image direction, the eleventh lens 11 is a negative focal power meniscus germanium lens which is bent to the image direction, and the twelfth lens 12 is a positive focal power biconvex germanium lens;
the medium wave projection lens group 04 is composed of 5 lenses, which are a thirteenth lens 13, a fourteenth lens 14, a fifteenth lens 15, a sixteenth lens 16 and a seventeenth lens 17 coaxially arranged along an optical axis in sequence, wherein the thirteenth lens 13 is a meniscus silicon lens with positive focal power bending to an object side, the fourteenth lens 14 is a meniscus silicon lens with positive focal power bending to an image side, the fifteenth lens 15 is a negative focal power biconcave germanium lens, the sixteenth lens 16 is a meniscus silicon lens with positive focal power bending to the image side, and the seventeenth lens 17 is a positive focal power biconvex silicon lens;
the zoom group can move back and forth along the optical axis direction to realize two-gear double-field zooming, and the embodiment can realize two-gear zooming of 185mm/370mm focal lengths of the long-wave infrared optical system and the medium-wave infrared optical system by axially moving the zoom group; the distance between the zoom group (the third lens 3) and the fourth lens 4 is changed from 89.82mm to 2.56mm, and the distance is changed from 87.26 mm.
The parameters of each lens in the dual-band dual-field optical system of the embodiment are shown in table 1, unit: mm.
TABLE 1 lens specific parameters in optical systems
The dual-band dual-field optical system of the embodiment: the focal length of the long-wave infrared optical system is 185mm/370mm, the relative aperture is 1/2, and the field of view is 2.97 degrees multiplied by 2.38 degrees (the diagonal is 3.81 degrees)/1.49 degrees multiplied by 1.19 degrees (the diagonal is 1.90 degrees); the focal length of the medium wave infrared optical system is 185mm/370mm, the relative aperture is 1/2, the viewing field is 2.97 degrees multiplied by 2.38 degrees (the diagonal is 3.81 degrees)/1.49 degrees multiplied by 1.19 degrees (the diagonal is 1.90 degrees); the device is suitable for a refrigeration type long-wave infrared thermal imager with the resolution of 640 multiplied by 512 and the pixel size of 15 mu m multiplied by 15 mu m, the cold screen efficiency is 100%, the total length of the common-aperture infrared dual-waveband double-field-of-view optical system is 614mm, and the aperture is 190 mm.
The dual-band dual-field optical system of the embodiment is a secondary imaging optical system, and comprises 12 lenses including a front fixed group 01, a zoom group, a rear fixed group 02 and a long-wave projection lens group 03 (or a medium-wave projection lens group 04), wherein the front fixed group 01, the zoom group and the rear fixed group 02 form a primary imaging system, the long-wave infrared optical system and the medium-wave infrared optical system share the primary imaging system, the primary imaging system and the long-wave projection lens group 03 form a long-wave infrared optical system, and the primary imaging system and the medium-wave projection lens group 04 form the medium-wave infrared optical system. The primary imaging system images an infinite target on a primary image surface, and finally the long-wave projection lens group 03 or the medium-wave projection lens group 04 images the target on the target surface of the thermal imager, so that the optical system is matched with the cold screen of the detector through the projection lens group, and the cold screen efficiency is 100%.
FIGS. 5-8 are graphs of MTF of the long-wavelength infrared/mid-wavelength infrared optical system at 185mm short focus/370 mm long focus, respectively. The MTF curve of the optical transfer function can comprehensively describe the imaging quality of the system, and is the most important index for measuring the imaging quality of the system. It can be seen from the figure that, at the spatial frequency of 33lp/mm, the on-axis and off-axis transfer functions MTF of the optical system of the present embodiment are both close to the diffraction limit, and have high imaging quality, thereby completely meeting the requirement of target detection.
FIGS. 9 to 12 are graphs of spherical aberration, field curvature and distortion of the long-wavelength infrared/medium-wavelength infrared optical system at 185mm/370mm short focus, respectively. For an object point on one axis, there are only two aberrations, spherical aberration and axial chromatic aberration, which are usually plotted on a aberration graph with the ordinate representing the beam aperture and the abscissa representing the spherical aberration and the axial chromatic aberration. To show the imaging sharpness of off-axis object points, it is generally shown by an astigmatism curve. In the curve, t and s represent the tangential and sagittal field curves, respectively, and the difference between the positions of t and s is the astigmatism. As can be seen from the figure, the distortion of the optical system of the embodiment is less than 1%, the imaging quality of the system is good, and the requirement of searching and tracking the infrared target can be met.
The above description is only for the purpose of describing the preferred embodiments of the present invention and does not limit the technical solutions of the present invention, and any known modifications made by those skilled in the art based on the main technical concepts of the present invention fall within the technical scope of the present invention.
Claims (9)
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| CN113376818A (en) * | 2021-04-28 | 2021-09-10 | 中国电子科技集团公司第十一研究所 | Dual-waveband dual-field-of-view optical system |
| CN113448067A (en) * | 2021-05-21 | 2021-09-28 | 中国科学院西安光学精密机械研究所 | Switching type zooming heat difference eliminating type long-wave infrared zoom lens |
| CN113448063A (en) * | 2021-05-21 | 2021-09-28 | 中国科学院西安光学精密机械研究所 | Large-view-field large-relative-aperture medium-wave infrared lens |
| CN113933976A (en) * | 2021-10-25 | 2022-01-14 | 季华实验室 | Long-focus dual-waveband infrared optical system |
| US20220342189A1 (en) * | 2021-04-23 | 2022-10-27 | Bae Systems Information And Electronic Systems Integration Inc. | Midwave infrared discrete zoom lens |
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