CN113687501B - Large-area-array double-view-field medium-wave infrared scanning optical system - Google Patents
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- 230000003287 optical effect Effects 0.000 title claims abstract description 144
- 238000005057 refrigeration Methods 0.000 claims abstract description 13
- 230000005499 meniscus Effects 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 11
- 230000004075 alteration Effects 0.000 claims description 10
- 238000003384 imaging method Methods 0.000 claims description 10
- 229910021421 monocrystalline silicon Inorganic materials 0.000 claims description 10
- 229910052732 germanium Inorganic materials 0.000 claims description 7
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 2
- 238000002834 transmittance Methods 0.000 abstract description 9
- 238000001514 detection method Methods 0.000 abstract description 8
- 230000006870 function Effects 0.000 description 10
- 238000012937 correction Methods 0.000 description 4
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- 239000005083 Zinc sulfide Substances 0.000 description 2
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- 229910052984 zinc sulfide Inorganic materials 0.000 description 2
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 2
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- 238000009529 body temperature measurement Methods 0.000 description 1
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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
- G02B17/0896—Catadioptric systems with variable magnification or multiple imaging planes, including multispectral systems
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- G—PHYSICS
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- 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
- G02B13/146—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation with corrections for use in multiple wavelength bands, such as infrared and visible light, e.g. FLIR systems
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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
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- 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
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- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
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Abstract
The invention discloses a large-area array double-view-field medium-wave infrared scanning optical system, which sequentially comprises a first main objective lens, a second objective lens, a first zoom lens, a second zoom lens, a turning mirror, a focusing lens, a first rear group lens, a second rear group lens, a third rear group lens, a scanning galvanometer and a fourth rear group lens from an object side to an image side along an optical axis direction; the double-view-field switching function is realized by cutting in and cutting out the first zoom lens and the second zoom lens; the deflection mirror and the scanning galvanometer are used for deflecting the light path twice and changing the direction of the light path in the optical system; by introducing the aspheric surface and the diffraction surface, the number of lenses is reduced, and the structure of the optical system is simplified. The invention has two working modes of gaze tracking and scanning searching; can be matched with a large-area array refrigeration type medium wave infrared detector, has high optical transmittance in a long-focus working state and excellent long-distance target detection performance.
Description
Technical Field
The invention belongs to the technical field of optics, and particularly relates to a large-area array double-view-field medium-wave infrared scanning optical system.
Background
The infrared thermal imaging technology has the advantages of all-weather operation, good concealment, strong anti-interference capability, high positioning precision, easy image observation and the like, and is widely applied to the fields of military, temperature measurement, electric power line inspection, boundary security protection and the like.
The traditional infrared optical system is used for stable tracking or gaze monitoring, and has a small perception range, so that external information is required for guiding, which limits the application range of the system to a large extent. If the infrared optical system is capable of continuous scanning search, its detection range can be greatly extended.
With the application requirement of the integration of searching and tracking, a continuous scanning type area array detector imaging system is developed. Scanning of a continuously scanned area array imaging system during the integration time can cause relative motion between the focal plane and the scene, causing smearing and blurring of the image. Through the backswing compensation technology, an area array scanning infrared system with the infrared Zhou Sao searching and gaze tracking functions can be realized.
In addition, the longer the focal length of the optical system, the longer the acting distance to the target, but the smaller the field of view thereof. And the large area array detector effectively relieves the contradiction between the focal length and the view field of the optical system, thereby ensuring that the infrared optical system has enough acting distance and panoramic scanning efficiency.
In order to meet new application requirements, related application research of a scanning type infrared searching and tracking system based on an area array detector is continuously developed.
In 2017, patent (grant publication number: CN 104932094B) discloses a medium wave infrared imaging lens for area array panoramic scanning. The lens has 12 lenses in total, has continuous zooming function, has a system focal length of 27 mm-450 mm, and can be matched with 320×256, 30 μm and 640×512, 15 μm medium wave refrigerating infrared detectors. The patent has two working modes of searching and tracking, but has 12 lenses in total, the system has low transmittance and does not support a large area array infrared detector.
In 2020, a turnover mid-wave two-range infrared optical system is disclosed (issued patent number: CN 108008529B). The optical system has 9 lenses, the F number of the system is 2.0, the working wave band is 3.7-4.8 mu m, the focal length is 100mm or 400mm, and the optical system can be matched with 320X 256, 30 mu m, 640X 512 and 15 mu m medium wave refrigerating infrared detectors for use. Although the number of lenses is small, the system transmittance is high, but the system does not have two working modes of searching and tracking, and a large area array infrared detector is not supported.
In 2020, a patent (issued to publication number: CN 110749986A) discloses an infrared continuous zoom area array scanning optical system. The optical system has 10 lenses, the F number of the system is 4.0, the working wave band is 3.7-4.8 mu m, the focal length of the system is 60-360 mm, and the optical system can be matched with 320X 256, 30 mu m, 640X 512 and 15 mu m medium wave refrigeration infrared detectors for use. Although the patent has two working modes of searching and tracking, the F number of the system is 4.0, the remote detection performance is poor, the lens number is more, and a large-area array infrared detector is not supported.
In 2020, a scanning type medium wave infrared optical system is disclosed in patent (issued publication number: CN 112114425A). The optical system has 10 lenses, the F number of the system is 2.0, the working wave band is 3.7-4.8 mu m, the focal length of the system is 180mm, and the system can be matched with 640 multiplied by 512 and 25 mu m medium wave refrigeration infrared detectors for use. Although the patent has two working modes of searching and tracking, the focal length of the system is shorter and the number of lenses is larger for a fixed-focus system.
Therefore, most of the infrared array scanning optical systems reported at present are designed in fixed focus or continuous zooming, the number of lenses of the optical systems is large, the optical transmittance is low, the remote detection performance of the infrared array scanning optical systems is limited to a large extent, and a large area array infrared detector is not supported, so that the scanning efficiency of the scanning optical systems is low.
Disclosure of Invention
The invention aims to: the invention aims to solve the technical problems that the current optical system has more lenses, lower optical transmittance, poor long-distance detection performance, and does not support a large-area array infrared detector, and provides a large-area array double-view-field medium-wave infrared scanning optical system.
The technical scheme adopted for solving the technical problems is as follows: the large-area array double-view-field medium-wave infrared scanning optical system sequentially comprises a first main objective lens (1), a second objective lens (2), a first zoom lens (3), a second zoom lens (4), a turning mirror (5), a focusing lens (6), a first rear group lens (7), a second rear group lens (8), a third rear group lens (9), a scanning galvanometer (10) and a fourth rear group lens (11) from the object side to the image side along the optical axis direction;
the first zoom lens (3) and the second zoom lens (4) are used for realizing the focal length switching function of the optical system by cutting in and cutting out on the optical path;
the turning mirror (5) and the scanning galvanometer (10) are used for turning the light path and changing the light propagation direction;
the incidence surface (S7) of the second zoom lens (4) is an aspheric surface plus a diffraction surface, and the incidence surface (S10) of the focusing lens (6) and the emergent surface (S20) of the fourth rear group lens (11) are both aspheric surfaces for correcting aberration of the optical system;
the F number of the optical system is 2.0, the working wave band is 3.7-4.8 mu m, the imaging circle diameter is not smaller than phi 20.5mm, and the optical system can be matched with a large-area array infrared detector.
Further, the first zoom lens (3) and the second zoom lens (4) cut out light paths, an optical system is in a long-focus working state, and the focal length is 450mm; the first zoom lens (3) and the second zoom lens (4) cut into an optical path, an optical system is in a short-focus working state, and the focal length is 150mm; the first variable magnification lens (3) and the second variable magnification lens (4) are cut into and out of the optical path, so that double-view-field switching is realized.
Furthermore, the double-view-field switching mode of the optical system can ensure the common optical axis and the common image plane of the long and short focus working states, and reduces the difficulty of the adjustment of a later optical machine.
Further, by introducing an aspherical surface and a diffraction surface and combining the focal power of a lens in an optical system, the optical system can complete the work of aberration correction in a long-short focal working state; in addition, in the long-focus working state, the number of lenses is reduced, the system has high optical transmittance, and the remote target detection and searching capability is improved.
Further, the first main objective lens (1), the second objective lens (2) and the first variable magnification lens (3) are meniscus lenses with convex surfaces facing the object; the second variable magnification lens (4) is a biconvex lens; the focusing lens (6) is a meniscus lens with a convex surface facing the scanning galvanometer (10).
Further, the first rear group lens (7) is a meniscus lens with a convex surface facing the scanning galvanometer (10); the second rear group lens (8) is a meniscus lens with a convex surface facing the turning mirror (5); the third rear group lens (9) is a biconcave lens; the fourth rear group lens (11) is a meniscus lens with a convex surface facing the scanning galvanometer (10).
Further, the focal power distribution of the first main objective lens (1), the second objective lens (2), the first variable magnification lens (3), the second variable magnification lens (4) and the focusing lens (6) is of a positive-negative-positive-negative structure in sequence.
Further, the optical power distribution of the first rear group lens (7), the second rear group lens (8), the third rear group lens (9) and the fourth rear group lens (11) is of a positive-negative-positive structure in sequence.
Further, the lens materials of the first main objective lens (1), the first variable magnification lens (3), the second variable magnification lens (4), the first rear group lens (7), the second rear group lens (8) and the fourth rear group lens (11) are monocrystalline silicon.
Further, the lens materials of the second objective lens (2), the focusing lens (6) and the third rear group lens (9) are monocrystalline germanium.
Furthermore, the large-area array double-view-field medium wave infrared scanning optical system provided by the invention has the advantages that the lens material of the optical system is monocrystalline silicon or monocrystalline germanium, and expensive materials such as zinc selenide and zinc sulfide are not used, so that the cost of the optical system is effectively reduced.
Further, the large area array infrared detector includes: the detector array is 640 multiplied by 512, the refrigerating type medium wave infrared detector with the pixel size of 25um and the detector array is 1280 multiplied by 1024, and the refrigerating type medium wave infrared detector with the pixel size of 12 um.
Furthermore, the large-area array infrared detector can effectively increase the field of view of the long-focus working state optical system, so that the infrared optical system is ensured to have enough acting distance and panoramic scanning efficiency.
Further, the cold diaphragm of the refrigeration detector supported by the optical system can be overlapped with the aperture diaphragm of the optical system, so that the requirement of 100% cold diaphragm efficiency of the refrigeration type infrared optical system is met.
Further, the optical system adopts a U-shaped structure, the turning mirror (5) is placed at an angle of 45 degrees with the light path, and the imaging light beam from the object is turned by 90 degrees; the scanning vibrating mirror (10) is also arranged at an angle of 45 degrees with the light path, and the light path is folded; the length of the optical system is effectively shortened, so that the optical system is very compact in structure.
Further, when the scanning galvanometer (10) is in a locking state, the system works in a gaze tracking mode for static target observation and stable tracking of a low-speed target, in the zooming process, the distortion of a long-focus working state is 1.5%, and the distortion of a short-focus working state is less than 3%; the optical system is fixed on a platform rotating at a constant speed, image motion compensation is realized through a scanning galvanometer (10), and the system works in a scanning searching mode.
The beneficial effects are that: (1) The dual-view-field switching function is provided, and the working mode and focal length of the optical system can be flexibly adjusted according to the target distance and task requirements; (2) The optical system can be adapted to the large-area array infrared detector, and the contradiction between the focal length and the view field of the optical system can be effectively relieved, so that the infrared optical system is ensured to have enough acting distance and panoramic scanning efficiency; (3) By carrying out focal power distribution on the lens, introducing an aspheric surface and a diffraction surface, and in a long-focus working state, only 7 lenses are used for completing aberration correction work, so that the optical system is ensured to have high optical transmittance, the structure of the optical system is simplified to a certain extent, and the long-distance detection performance is excellent.
Drawings
FIG. 1 is a schematic view of an optical path structure of an optical system according to the present invention;
wherein, 1-first main objective lens, 2-second objective lens, 3-first zoom lens, 4-second zoom lens, 5-turning reflector, 6-focusing lens, 7-a first rear group lens, 8-a second rear group lens, 9-a third rear group lens, 10-a scanning galvanometer, 11-a fourth rear group lens;
FIG. 2 is a schematic view of an optical system in a tele operating state according to the present invention;
FIG. 3 is a schematic view of an optical system in a short focal length operation state of the present invention;
FIG. 4 is a graph of optical modulation transfer function of the long focal length operating state of the optical system of the present invention;
FIG. 5 is a graph of optical modulation transfer function for the short focal length operating state of the optical system of the present invention;
FIG. 6 is a graph of longitudinal spherical aberration, curvature of field and distortion of the tele operating state of the optical system of the present invention;
FIG. 7 is a graph of longitudinal spherical aberration, curvature of field and distortion of the short focal length operating state of the optical system of the present invention;
FIG. 8 is a spot diagram of the tele operation of the optical system of the present invention;
fig. 9 is a spot diagram of the short focal operation state of the optical system of the present invention.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
As shown in fig. 1, the large area array double-view field medium wave infrared scanning optical system of the present invention comprises a first main objective lens 1, a second sub objective lens 2, a first zoom lens 3, a second zoom lens 4, a turning mirror 5, a focusing lens 6, a first rear group lens 7, a second rear group lens 8, a third rear group lens 9, a scanning galvanometer 10 and a fourth rear group lens 11.
The first main objective lens 1 is a monocrystalline silicon lens with positive focal power, and the first main objective lens 1 is a meniscus lens with a convex surface facing an object space; the second objective lens 2 is a monocrystalline germanium lens with negative focal power, and the second objective lens 2 is a meniscus lens with a convex surface facing the object space; the first variable power lens 3 is a monocrystalline silicon lens with negative focal power, and the first variable power lens 3 is a meniscus lens with a convex surface facing an object; the second variable power lens 4 is a monocrystalline silicon lens with positive focal power, and the second variable power lens 4 is a biconvex lens; the focusing lens 6 is a monocrystalline germanium lens with negative focal power, and the focusing lens 6 is a meniscus lens with a convex surface facing the scanning galvanometer 10; the first rear group lens 7 is a monocrystalline silicon lens with positive focal power, and the first rear group lens 7 is a meniscus lens with a convex surface facing the scanning galvanometer 10; the second rear group lens 8 is a monocrystalline silicon lens with positive focal power, and the second rear group lens 8 is a meniscus lens with a convex surface facing the turning mirror 5; the third rear group lens 9 is a monocrystalline germanium lens with negative focal power, and the third rear group lens 9 is a biconcave lens; the fourth rear group lens 11 is a single crystal silicon lens of positive power, and the fourth rear group lens 11 is a meniscus lens with its convex surface facing the scanning galvanometer 10.
The lens material of the optical system is monocrystalline silicon or monocrystalline germanium, and expensive materials such as zinc selenide and zinc sulfide are not used, so that the cost of the optical system is effectively reduced.
Specific parameters of each lens of the large area array double-view field medium wave infrared scanning optical system are shown in the following table 1.
Table 1 optical system parameter table
In table 1, the radius of curvature is the radius of curvature of each surface, and the interval refers to the distance between the adjacent two surfaces.
The optical system composed of the lenses achieves the following optical indexes:
(1) Focal length: 450mm/150mm;
(2) F number of F number: 2.0;
(3) Imaging circle diameter: not less than phi 20.5mm;
(4) Working wave band: 3.7um to 4.8um;
(5) Adapting the detector: 640×512, 25um refrigeration type medium wave infrared detector or 1280×1024, 12 μm refrigeration type medium wave infrared detector.
As shown in fig. 2 and 3, the large-area array double-view-field mid-wave infrared scanning optical system has a double-view-field switching function, and the focal length of the optical system can be flexibly adjusted according to the target distance and task requirements. The optical system realizes double-view-field switching by cutting in and cutting out light paths through the first zoom lens 3 and the second zoom lens 4; the first zoom lens 3 and the second zoom lens 4 cut out light paths to be in a long-focus working state, and the focal length of the system is 450mm; the first zoom lens 3 and the second zoom lens 4 cut into the light path to be in a short focus working state, and the focal length of the system is 150mm.
In order to improve the transmittance of the optical system as much as possible and ensure the long-distance detection performance of the system, and also to simplify the structure of the optical system, the invention can utilize 9 lenses to complete aberration correction work in a short-focus working state by introducing 3 aspheric surfaces and 1 diffraction surface; in the long focal working state, only 7 lenses are used for completing the aberration correction work of the large area array optical system, and the optical transmittance is high.
Fig. 4 is a graph of a long focal length 450mm optical modulation transfer function, and fig. 5 is a graph of a short focal length 150mm optical modulation transfer function. As shown in fig. 4 and 5, in the long and short focal working state, the optical system can well correct system aberration through reasonable optical power distribution, material combination and introduction of an aspheric surface and a diffraction surface, and each view field is close to a diffraction limit, so that the imaging quality is good.
Wherein the incident surface S7 of the second variable magnification lens 4 is an aspheric surface plus a diffraction surface; the incident surface S10 of the focusing mirror 6 is an aspheric surface; the exit surface S20 of the fourth rear group lens 11 is aspherical.
The aspherical surface type equations of S7, S10 and S20 are as follows:
wherein: z is the position in the direction of the optical axis; r is the radial height; c is the radius of curvature; k is a conic coefficient; A. b, C, D is an aspherical coefficient.
The aspherical coefficients of the respective aspherical surfaces corresponding thereto are shown in table 2 below:
table 2 table of aspherical coefficients
| Surface of the body | K | A | B | C | D |
| S7 | 0 | -8.15E-8 | 3.55E-11 | -7.28E-14 | 4.91E-17 |
| S10 | 0 | 1.61E-6 | -1.67E-9 | -3.53E-12 | 1.44E-14 |
| S20 | 0 | 3.72E-7 | 1.95E-9 | -9.34E-12 | 3.78E-14 |
The diffraction surface microstructure distribution of the diffraction surface S7 is:
wherein: h (r) is the diffraction surface microstructure height; m is the diffraction order; n is the refractive index of the base material at the wavelength λ; n is n 0 At the center wavelength lambda for the base material 0 A rate of deflection at the location; INT is a rounding function; c (C) 1 、C 2 、C 3 Is a diffraction coefficient.
The diffraction coefficients of the corresponding diffraction planes are shown in table 3 below:
TABLE 3 diffraction coefficient table
| Surface of the body | m | λ 0 | C 1 | C 2 | C 3 |
| S7 | 1 | 4.2μm | -6.02E-5 | -8.89E-10 | -5.29E-12 |
As shown in fig. 6 and 7, the spherical aberration and field curvature of the wave infrared scanning optical system in the large-area array double-view field are effectively controlled; the distortion of the long-focus working state is 1.5%, and the distortion of the short-focus working state is less than 3%.
As shown in figures 8 and 9, the RMS root mean square radius value of the point column diagram of each view field of the large-area array double-view-field medium-wave infrared scanning optical system is far smaller than the pixel size of the refrigeration medium-wave infrared detector, and the large-area array double-view-field medium-wave infrared scanning optical system has good energy concentration and excellent comprehensive performance.
According to the large-area-array double-view-field medium-wave infrared scanning optical system, the aperture diaphragm of the optical system is overlapped with the cold diaphragm of the refrigeration detector, so that the requirement of 100% cold diaphragm efficiency of the refrigeration type infrared optical system is met, the entrance pupil diameter of the optical system can be compressed to the greatest extent, and the volume of the optical system is reduced.
The large-area-array double-view-field medium-wave infrared scanning optical system has two working modes: a gaze tracking mode and a scanning search mode, respectively. The gaze tracking mode is realized by locking the position of the scanning galvanometer 10, and the optical system in the working mode is equivalent to a traditional double-view-field medium-wave infrared optical system, and can be used for static target observation and stable tracking of a low-speed target; the scanning search mode is to fix the large-area array double-view-field medium-wave infrared scanning optical system on a platform rotating at a constant speed, and realize image motion compensation through the scanning galvanometer 10, thereby realizing panoramic scanning.
When the large-area array double-view-field medium wave infrared scanning optical system is in a scanning imaging mode, the effective backswing angle alpha of the scanning galvanometer 10 and the scanning speed omega of the optical system have the following relation:
wherein: gamma is the angular magnification of an optical system consisting of a first primary objective lens 1, a second secondary objective lens 2, a first variable magnification lens 3, a second variable magnification lens 4, a focusing lens 6, a first rear group lens 7, a second rear group lens 8 and a third rear group lens 9; τ is the integration time of the refrigerated medium wave infrared detector.
The optical system belongs to a large area array imaging optical system, and is matched with a large area array infrared detector, so that the visual field of the optical system in a long-focus working state can be effectively increased, the contradiction between the focal length and the visual field of the optical system is relieved, and the infrared optical system has enough action distance and panoramic scanning efficiency.
In addition, the large-area array double-view-field medium wave infrared scanning optical system adopts a U-shaped structure, and the light path is folded by utilizing the folding reflector 5 and the scanning galvanometer 10, so that the length of the optical system is effectively shortened; meanwhile, the whole optical system only comprises 9 lenses, so that the structure of the optical system is very simple and compact.
The invention provides a thinking and a method for realizing a large-area array double-view-field medium-wave infrared scanning optical system, and the method and the way for realizing the technical scheme are a plurality of methods, the above is only a preferred embodiment of the invention, and it should be pointed out that a plurality of improvements and modifications can be made by one of ordinary skill in the art without departing from the principle of the invention, and the improvements and modifications are also regarded as the protection scope of the invention. The components not explicitly described in this embodiment can be implemented by using the prior art.
Claims (8)
1. The large-area array double-view-field medium-wave infrared scanning optical system is characterized by sequentially comprising a first main objective lens (1), a second objective lens (2), a first zoom lens (3), a second zoom lens (4), a turning mirror (5), a focusing mirror (6), a first rear group lens (7), a second rear group lens (8), a third rear group lens (9), a scanning galvanometer (10) and a fourth rear group lens (11) from an object side to an image side along the optical axis direction; the elements with optical power in the scanning optical system are only a first main objective lens (1), a second sub objective lens (2), a first variable magnification lens (3), a second variable magnification lens (4), a focusing lens (6), a first rear group lens (7), a second rear group lens (8), a third rear group lens (9) and a fourth rear group lens (11);
the first zoom lens (3) and the second zoom lens (4) are used for realizing the focal length switching function of the optical system by cutting in and cutting out on the optical path;
the turning mirror (5) and the scanning galvanometer (10) are used for turning the light path and changing the light propagation direction;
the incidence surface (S7) of the second zoom lens (4) is an aspheric surface plus a diffraction surface, and the incidence surface (S10) of the focusing lens (6) and the emergent surface (S20) of the fourth rear group lens (11) are both aspheric surfaces for correcting aberration of the optical system;
the F number of the optical system is 2.0, the working wave band is 3.7-4.8 mu m, and the imaging circle diameter is not less thanΦ20.5mm; the focal power distribution of the first main objective lens (1), the second objective lens (2), the first zoom lens (3), the second zoom lens (4) and the focusing lens (6) is of a positive-negative-positive-negative structure in sequence;
the focal power distribution of the first rear group lens (7), the second rear group lens (8), the third rear group lens (9) and the fourth rear group lens (11) is of a positive-negative-positive structure in sequence.
2. The large-area array double-view-field medium-wave infrared scanning optical system according to claim 1, wherein the first zoom lens (3) and the second zoom lens (4) cut out light paths, the optical system is in a long-focus working state, and the focal length is 450mm; the first zoom lens (3) and the second zoom lens (4) cut into an optical path, an optical system is in a short-focus working state, and the focal length is 150mm.
3. The large area array double-view-field medium wave infrared scanning optical system according to claim 1, wherein the first main objective lens (1), the second objective lens (2) and the first zoom lens (3) are meniscus lenses with convex surfaces facing to an object space; the second variable magnification lens (4) is a biconvex lens; the focusing lens (6) is a meniscus lens with a convex surface facing the scanning galvanometer (10).
4. A large area array dual field of view mid-wave infrared scanning optical system according to claim 1, characterized in that said first rear group lens (7) is a meniscus lens with convex surface facing the scanning galvanometer (10); the second rear group lens (8) is a meniscus lens with a convex surface facing the turning mirror (5); the third rear group lens (9) is a biconcave lens; the fourth rear group lens (11) is a meniscus lens with a convex surface facing the scanning galvanometer (10).
5. The large area array double-view-field mid-wave infrared scanning optical system according to claim 1, wherein the lens materials of the first main objective lens (1), the first variable magnification lens (3), the second variable magnification lens (4), the first rear group lens (7), the second rear group lens (8) and the fourth rear group lens (11) are monocrystalline silicon.
6. A large area array dual field of view mid-wave infrared scanning optical system according to claim 1, characterized in that the lens material of said second objective lens (2), focusing lens (6) and third rear group lens (9) is monocrystalline germanium.
7. The large area array double-view-field medium wave infrared scanning optical system according to claim 1, wherein the imaging light beam from the object space can be matched with the large area array infrared detector after passing through the fourth rear group lens (11); the large-area array infrared detector is a refrigeration type medium-wave infrared detector, and the cold diaphragm of the refrigeration type medium-wave infrared detector can be overlapped with the aperture diaphragm of the optical system, so that the requirement of 100% cold diaphragm efficiency of the refrigeration type infrared optical system is met.
8. The large-area array double-view-field medium-wave infrared scanning optical system according to claim 1, wherein the scanning galvanometer (10) is placed at an angle of 45 degrees with the optical path, when the scanning galvanometer (10) is in a locking state, the system works in a gaze tracking mode, the distortion of a long-focus working state is 1.5% and the distortion of a short-focus working state is less than 3% in a zooming process; the optical system is fixed on a platform rotating at a constant speed, image motion compensation is carried out through a scanning galvanometer (10), and the system works in a scanning searching mode.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4989962A (en) * | 1988-10-31 | 1991-02-05 | Hughes Aircraft Company | Dual band/dual FOV infrared telescope |
| JP2009204655A (en) * | 2008-02-26 | 2009-09-10 | Tokina:Kk | Lens system |
| RU149238U1 (en) * | 2014-09-23 | 2014-12-27 | Открытое акционерное общество "Научно-производственное объединение "Государственный институт прикладной оптики" (ОАО "НПО ГИПО") | OPTICAL SYSTEM OF THE THERMAL VISION DEVICE WITH TWO FIELDS OF VISION |
| CN107121769A (en) * | 2017-06-12 | 2017-09-01 | 湖北久之洋红外系统股份有限公司 | A kind of long wave linear array type scanned infrared imaging optical system |
| CN209297023U (en) * | 2018-12-04 | 2019-08-23 | 河北汉光重工有限责任公司 | A kind of high plain shaft precision, miniaturization double-view field freeze medium-wave infrared optical system |
| CN112305727A (en) * | 2020-11-17 | 2021-02-02 | 湖北久之洋红外系统股份有限公司 | High-speed switching type dual-waveband dual-view-field optical system based on infrared dual-color detector |
| CN112817068A (en) * | 2021-01-04 | 2021-05-18 | 中国科学院西安光学精密机械研究所 | Compact athermal medium-wave infrared double-field-of-view rapid zoom lens |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8724216B2 (en) * | 2010-12-22 | 2014-05-13 | The United States Of America As Represented By The Secretary Of The Army | Dual band infrared continuous zoom lens |
-
2021
- 2021-08-16 CN CN202110935075.9A patent/CN113687501B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4989962A (en) * | 1988-10-31 | 1991-02-05 | Hughes Aircraft Company | Dual band/dual FOV infrared telescope |
| JP2009204655A (en) * | 2008-02-26 | 2009-09-10 | Tokina:Kk | Lens system |
| RU149238U1 (en) * | 2014-09-23 | 2014-12-27 | Открытое акционерное общество "Научно-производственное объединение "Государственный институт прикладной оптики" (ОАО "НПО ГИПО") | OPTICAL SYSTEM OF THE THERMAL VISION DEVICE WITH TWO FIELDS OF VISION |
| CN107121769A (en) * | 2017-06-12 | 2017-09-01 | 湖北久之洋红外系统股份有限公司 | A kind of long wave linear array type scanned infrared imaging optical system |
| CN209297023U (en) * | 2018-12-04 | 2019-08-23 | 河北汉光重工有限责任公司 | A kind of high plain shaft precision, miniaturization double-view field freeze medium-wave infrared optical system |
| CN112305727A (en) * | 2020-11-17 | 2021-02-02 | 湖北久之洋红外系统股份有限公司 | High-speed switching type dual-waveband dual-view-field optical system based on infrared dual-color detector |
| CN112817068A (en) * | 2021-01-04 | 2021-05-18 | 中国科学院西安光学精密机械研究所 | Compact athermal medium-wave infrared double-field-of-view rapid zoom lens |
Non-Patent Citations (2)
| Title |
|---|
| 中波红外双视场光学系统的设计;李荣刚;《激光与红外》;第39卷(第6期);第640-642页 * |
| 制冷型中／长红外双波段双视场全景光学系统设计;刘钧;《应用光学》;第37卷(第3期);第456-464页 * |
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