CN113687501A - Large-area-array double-field-of-view medium wave infrared scanning optical system - Google Patents
Large-area-array double-field-of-view medium wave infrared scanning optical system Download PDFInfo
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- 230000003287 optical effect Effects 0.000 title claims abstract description 145
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- 238000005057 refrigeration Methods 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
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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
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- 230000009471 action Effects 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
- 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
- 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
- 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
- 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
Abstract
The invention discloses a large-area-array double-field-of-view medium wave infrared scanning optical system which sequentially comprises a first main objective lens, a second secondary objective lens, a first zoom lens, a second zoom lens, a turning reflector, 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 space to an image space along the optical axis direction; the double-view-field switching function is realized by switching in and switching out the first variable power lens and the second variable power lens; the deflecting reflector and the scanning galvanometer deflect the light path twice and are used for 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 search; the optical transmission rate is high in a long-focus working state, and the long-distance target detection performance is excellent.
Description
Technical Field
The invention belongs to the technical field of optics, and particularly relates to a large-area-array double-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 affairs, temperature measurement, power line patrol, boundary security and the like.
The traditional infrared optical system is used for stable tracking or gaze monitoring, has a small perception range, and therefore needs external information guidance, which greatly limits the application range of the traditional infrared optical system. If the infrared optical system can realize continuous scanning search, the detection range can be greatly expanded.
With the application requirement of integration of search and tracking, a continuous scanning type surface array detector imaging system is developed. Scanning of a continuous scan type linear array imaging system during the integration time results in relative motion between the focal plane and the scene, causing smearing and blurring of the image. By the backswing compensation technology, the area array scanning infrared system with the functions of infrared periphery scanning search and gaze tracking can be realized.
In addition, the longer the focal length of the optical system, the longer the action distance to the target, but the smaller the field of view. 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 working distance and panoramic scanning efficiency.
In order to meet the new application requirements, related application research of a scanning type infrared search tracking system based on an area array detector is developed successively.
In 2017, a 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 a continuous zooming function, has a system focal length of 27 mm-450 mm, and can be matched with 320 multiplied by 256, 30 mu m and 640 multiplied by 512, 15 mu m medium wave refrigeration infrared detectors for use. Although the patent has two working modes of searching and tracking, the total number of the working modes is 12, the system transmittance is low, and a large-area array infrared detector is not supported.
In 2020, a patent (grant publication number: CN 108008529B) discloses a flip-type medium-wave two-level infrared optical system. The optical system has 9 lenses in total, the F number of the system is 2.0, the working waveband is 3.7-4.8 mu m, the focal length is 100mm or 400mm, and the optical system can be matched with 320 multiplied by 256, 30 mu m and 640 multiplied by 512, 15 mu m medium wave refrigeration infrared detectors for use. Although the patent has fewer lenses and high system transmittance, the patent does not have two working modes of searching and tracking and does not support a large-area array infrared detector.
In 2020, the patent (grant publication: CN 110749986 a) discloses an infrared continuous zoom area array scanning optical system. The optical system has 10 lenses in total, the F number of the system aperture is 4.0, the working waveband is 3.7-4.8 mu m, the focal length of the system is 60-360 mm, and the system can be matched with 320 multiplied by 256, 30 mu m and 640 multiplied by 512, 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 aperture is 4.0, the remote detection performance is poor, the number of lenses is large, and the large-area array infrared detector is not supported.
In 2020, a scanning type medium wave infrared optical system is disclosed in the patent (grant publication: CN 112114425 a). The optical system has 10 lenses in total, the F number of the system is 2.0, the working waveband is 3.7-4.8 mu m, the focal length of the system is 180mm, and the system can be matched with a 640 multiplied by 512 and 25 mu m medium wave refrigeration infrared detector 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 more for a fixed-focus system.
Therefore, most of the currently reported infrared area array scanning optical systems are designed to be fixed-focus or continuous zooming, the number of lenses of the optical system is large, the optical transmittance is low, the remote detection performance of the optical system 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 system is low.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the technical problems that the existing optical system is large in lens number, low in optical transmittance, poor in remote detection performance, incapable of supporting a large-area-array infrared detector and the like, and provides a large-area-array double-view-field medium wave infrared scanning optical system.
The technical scheme adopted by the invention for solving the technical problems is as follows: a large-area-array double-field-of-view medium wave infrared scanning optical system sequentially comprises a first main objective (1), a second secondary objective (2), a first zoom lens (3), a second zoom lens (4), a turning reflector (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 an object space to an image space along an optical axis direction;
the first variable power lens (3) and the second variable power lens (4) are switched in and out on an optical path to realize the focal length switching function of the optical system;
the folding reflector (5) and the scanning galvanometer (10) are used for folding 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 exit surface (S20) of the fourth rear group lens (11) are both aspheric surfaces and are used for correcting aberration of the optical system;
the aperture F number of the optical system is 2.0, the working waveband is 3.7-4.8 mu m, the diameter of an imaging circle is not less than phi 20.5mm, and the optical system can be matched with a large-area array infrared detector for use.
Furthermore, the first variable power lens (3) and the second variable power lens (4) cut out light paths, the optical system is in a long-focus working state, and the focal length is 450 mm; the first zoom lens (3) and the second zoom lens (4) are cut into a light path, the optical system is in a short-focus working state, and the focal length is 150 mm; the dual-view switching is realized by switching in and out the optical path of the first variable power lens (3) and the second variable power lens (4).
Furthermore, the double-view-field switching mode of the optical system can ensure that the working states of the long focal length and the short focal length are coaxial and are coaxial with the image plane, and the difficulty of later-stage optical machine adjustment is reduced.
Furthermore, by introducing an aspheric surface and a diffraction surface and combining the focal power of a lens in the optical system, the optical system can finish the work of aberration correction in the long-and-short-focus working state; in the long-focus working state, the number of the lenses is reduced, the system has high optical transmittance, and the remote target detection and search capability is improved.
Furthermore, the first main objective lens (1), the second secondary objective lens (2) and the first variable power lens (3) are meniscus lenses with convex surfaces facing to an object; the second variable power 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 reflector (5); the third rear group lens (9) is a double-concave lens; the fourth rear group lens (11) is a meniscus lens with a convex surface facing the scanning galvanometer (10).
Furthermore, the focal power distribution of the first main objective lens (1), the second secondary objective lens (2), the first zoom lens (3), the second zoom lens (4) and the focusing lens (6) is a positive-negative-positive-negative structure in sequence.
Further, the 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 in a positive-negative-positive structure in sequence.
Furthermore, the lens materials of the first main objective lens (1), the first variable power lens (3), the second variable power 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 material of the secondary objective lens (2), the focusing lens (6) and the third rear group lens (9) is single crystal germanium.
Furthermore, according to the large-area-array double-field medium wave infrared scanning optical system, the lens material of the optical system is monocrystalline silicon or monocrystalline germanium, expensive materials such as zinc selenide and zinc sulfide are not used, and the cost of the optical system is effectively reduced.
Further, the large-area array infrared detector comprises: the detector array is 640 multiplied by 512, the refrigeration type medium wave infrared detector with the pixel size of 25um and the refrigeration type medium wave infrared detector with the detector array of 1280 multiplied by 1024 and the pixel size of 12 mu m.
Furthermore, the large-area array infrared detector can effectively increase the view field of the optical system in the long-focus working state, so that the infrared optical system is ensured to have enough acting distance and panoramic scanning efficiency.
Furthermore, a cold diaphragm of the refrigeration detector which can be supported by the optical system can be superposed with an aperture diaphragm of the optical system, so that the requirement of 100% cold diaphragm efficiency of the refrigeration type infrared optical system is met.
Furthermore, the optical system adopts a U-shaped structural form, the folding reflector (5) and the light path are arranged at an angle of 45 degrees, and imaging light beams from an object space are folded by 90 degrees; the scanning galvanometer (10) is also arranged at an angle of 45 degrees with the optical path to fold the optical path; the length of the optical system is effectively shortened, so that the structure of the optical system is very compact.
Further, when the scanning galvanometer (10) is in a locked state, the system works in a gaze tracking mode for static target observation and stable tracking of a low-speed target, and 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 search mode.
Has the advantages that: (1) the optical system has a double-view-field switching function, and can flexibly adjust the working mode and the focal length of the optical system according to the target distance and the task requirement; (2) the optical system can be adapted to a large-area array infrared detector, and can effectively relieve the contradiction between the focal length and the view field of the optical system, so that the infrared optical system is ensured to have enough working distance and panoramic scanning efficiency; (3) by distributing focal power to the lenses and introducing the aspheric surface and the diffraction surface, in a long-focus working state, aberration correction is completed by only using 7 lenses, 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 optical system has excellent long-distance detection performance.
Drawings
FIG. 1 is a schematic diagram of an optical path structure of an optical system according to the present invention;
the system comprises a first main objective lens, a second secondary objective lens, a first variable power lens, a second variable power lens, a 5-turning reflector, a 6-focusing lens, a 7-first rear group lens, a 8-second rear group lens, a 9-third rear group lens, a 10-scanning galvanometer and a 11-fourth rear group lens, wherein the first main objective lens, the 2-second secondary objective lens, the 3-first variable power lens, the 4-second variable power lens, the 5-turning reflector, the 6-focusing lens, the 7-first rear group lens, the 8-second rear group lens, the 9-third rear group lens, the 10-scanning galvanometer and the 11-fourth rear group lens are arranged in sequence;
FIG. 2 is a schematic view of the optical system in the tele mode of the present invention;
FIG. 3 is a schematic diagram of the optical system in a short-focus operating state according to the present invention;
FIG. 4 is a diagram of the optical modulation transfer function for the tele operation of the optical system of the present invention;
FIG. 5 is a diagram of the optical modulation transfer function of the short focus operating mode of the optical system of the present invention;
FIG. 6 is a longitudinal spherical aberration, field curvature and distortion plot of the tele working state of the optical system of the present invention;
FIG. 7 is a longitudinal spherical aberration, field curvature and distortion plot of the short focal length of the optical system of the present invention;
FIG. 8 is a diagram of a spot diagram of the tele working state of the optical system of the present invention;
FIG. 9 is a schematic diagram of the short focus operation of the optical system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the large-area-array dual-field-of-view medium wave infrared scanning optical system of the present invention includes a first primary objective lens 1, a second secondary objective lens 2, a first zoom lens 3, a second zoom lens 4, a turning mirror 5, a focusing lens 6, a first rear lens group 7, a second rear lens group 8, a third rear lens group 9, a scanning galvanometer 10, and a fourth rear lens group 11.
The first main objective lens 1 is a single crystal 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 secondary objective lens 2 is a single crystal germanium lens with negative focal power, and the secondary objective lens 2 is a meniscus lens with a convex surface facing the object space; the first zoom lens 3 is a single crystal silicon lens with negative focal power, and the first zoom lens 3 is a meniscus lens with a convex surface facing an object; the second zoom lens 4 is a single crystal silicon lens with positive focal power, and the second zoom lens 4 is a biconvex lens; the focusing lens 6 is a single crystal 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 single crystal 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 single crystal silicon lens with positive focal power, and the second rear group lens 8 is a meniscus lens with a convex surface facing the folding reflector 5; the third rear group lens 9 is a single crystal germanium lens with negative focal power, and the third rear group lens 9 is a double concave lens; the fourth rear group lens 11 is a single crystal silicon lens with positive focal power, and the fourth rear group lens 11 is a meniscus lens with a 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.
The specific parameters of each lens of the large-area-array double-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 two adjacent surfaces.
The optical system composed of the lens achieves the following optical indexes:
(1) focal length: 450mm/150 mm;
(2) aperture F number: 2.0;
(3) diameter of imaging circle: not less than phi 20.5 mm;
(4) the working wave band is as follows: 3.7um to 4.8 um;
(5) adapting the detector: 640 x 512, 25um refrigeration type medium wave infrared detector or 1280 x 1024, 12 μm refrigeration type medium wave infrared detector.
As shown in fig. 2 and 3, the large-area-array dual-field medium wave infrared scanning optical system has a dual-field switching function, and the focal length of the optical system can be flexibly adjusted according to the target distance and the task requirement. The optical system is switched in and out of an optical path through a first variable power lens 3 and a second variable power lens 4 to realize double-view switching; the light path cut by the first variable power lens 3 and the second variable power lens 4 is in a long-focus working state, and the focal length of the system is 450 mm; the first zoom lens 3 and the second zoom lens 4 are switched into the optical path to be in a short-focus working state, and the focal length of the system is 150 mm.
In order to improve the transmittance of an optical system as much as possible, ensure the long-distance detection performance of the system and simplify the structure of the optical system, the invention can utilize 9 lenses to finish aberration correction work in a short-focus working state by introducing 3 aspheric surfaces and 1 diffraction surface; in the long-focus working state, the aberration correction work of the large-area-array optical system is completed by only using 7 lenses, and the optical transmittance is high.
FIG. 4 is a graph of the optical modulation transfer function for a long focus of 450mm, and FIG. 5 is a graph of the optical modulation transfer function for a short focus of 150 mm. As shown in fig. 4 and 5, in the long-and-short-focus working state, by reasonably distributing the focal power, combining the materials and introducing the aspheric surface and the diffraction surface, the optical system can well correct the aberration of the system, each field is close to the diffraction limit, and the imaging quality is good.
Wherein, the incident surface S7 of the second variable power lens 4 is an aspheric surface plus a diffraction surface; the incidence surface S10 of the focusing mirror 6 is an aspherical surface; the emission surface S20 of the fourth rear group lens 11 is aspherical.
The aspherical surface type equations of S7, S10 and S20 are as follows:
in the formula: 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 are aspheric coefficients.
The aspheric coefficients of the respective aspheric surfaces corresponding thereto are shown in table 2 below:
TABLE 2 aspheric coefficients table
| Surface of | K | A | B | C | D |
| S7 | 0 | -8.15E-8 | 3.55E-11 | -7.28E-14 | 4.91 |
| S10 | |||||
| 0 | 1.61E-6 | -1.67E-9 | -3.53E-12 | 1.44 | |
| S20 | |||||
| 0 | 3.72E-7 | 1.95E-9 | -9.34E-12 | 3.78E-14 |
The diffractive surface microstructure distribution of the diffractive surface S7 is:
in the formula: h (r) is the diffractive surface microstructure height; m is a diffraction order; n is the rate of turn of the base material at the wavelength λ; n is0For the base material at a central wavelength λ0The rate of turn-down; INT is an integer function; c1、C2、C3Is the diffraction coefficient.
The diffraction coefficients of the corresponding diffraction surfaces are shown in table 3 below:
TABLE 3 diffraction coefficient Table
| Surface of | m | λ0 | C1 | C2 | C3 |
| S7 | 1 | 4.2μm | -6.02E-5 | -8.89E-10 | -5.29E-12 |
As shown in fig. 6 and 7, the spherical aberration and the curvature of field of the large-area array dual-field-of-view medium wave infrared scanning optical system are effectively controlled; the distortion of the working state of the long focus is 1.5 percent, and the distortion of the working state of the short focus is less than 3 percent.
As shown in FIGS. 8 and 9, the RMS root-mean-square radius value of the dot-sequence chart of each field of view of the large-area-array double-field-of-view medium wave infrared scanning optical system is far smaller than the pixel size of the refrigeration type medium wave infrared detector, so that the energy concentration is good, and the comprehensive performance is excellent.
According to the large-area-array double-field medium wave infrared scanning optical system, the aperture diaphragm of the optical system is overlapped with the cold diaphragm of the refrigeration detector, 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 maximum extent, and therefore the size of the optical system is reduced.
The large-area array double-field-of-view medium wave infrared scanning optical system has two working modes: gaze tracking mode and scan search mode, respectively. The gazing tracking mode is realized by locking the position of the scanning galvanometer 10, and an 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 low-speed targets; in the scanning search mode, the large-area-array double-field medium wave infrared scanning optical system is fixed on a platform rotating at a constant speed, and image motion compensation is realized through the scanning galvanometer 10, so that panoramic scanning is realized.
When the large-area array double-field-of-view medium wave infrared scanning optical system is in a scanning imaging mode, the effective backswing angle α of the scanning galvanometer 10 and the scanning speed ω of the optical system have the following relationship:
in the formula: γ is the angular magnification of an optical system composed of the first primary objective lens 1, the second secondary objective lens 2, the first variable power lens 3, the second variable power lens 4, the focusing lens 6, the first rear group lens 7, the second rear group lens 8 and the third rear group lens 9; tau is the integral time of the refrigeration type 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 field of view of the optical system in a long-focus working state can be effectively increased, and the contradiction between the focal length and the field of view of the optical system is relieved, thereby ensuring that the infrared optical system has enough working distance and panoramic scanning efficiency.
In addition, the large-area-array double-field medium wave infrared scanning optical system adopts a U-shaped structural form, and the optical 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 present invention provides a concept and a method for a large-area array dual-field mid-wave infrared scanning optical system, and a method and a way for implementing the technical scheme are many, and the above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and embellishments can be made without departing from the principle of the present invention, and these improvements and embellishments should also be regarded as the protection scope of the present invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (10)
1. A large-area-array double-field-of-view medium wave infrared scanning optical system is characterized by comprising a first main objective lens (1), a second secondary objective lens (2), a first zoom lens (3), a second zoom lens (4), a turning reflector (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) in sequence from an object space to an image space along an optical axis direction;
the first variable power lens (3) and the second variable power lens (4) are switched in and out on an optical path to realize the focal length switching function of the optical system;
the folding reflector (5) and the scanning galvanometer (10) are used for folding 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 exit surface (S20) of the fourth rear group lens (11) are both aspheric surfaces and are used for correcting aberration of the optical system;
the aperture F number of the optical system is 2.0, the working waveband is 3.7-4.8 mu m, and the diameter of the imaging circle is not less than phi 20.5 mm.
2. The large-area-array double-field-of-view medium wave infrared scanning optical system according to claim 1, characterized in that the first variable power lens (3) and the second variable power lens (4) cut out light paths, the optical system is in a long-focus working state, and the focal length is 450 mm; the first zoom lens (3) and the second zoom lens (4) are cut into a light path, the optical system is in a short-focus working state, and the focal length is 150 mm.
3. The large-area-array double-field-of-view medium wave infrared scanning optical system according to claim 1, characterized in that the first primary objective lens (1), the second secondary objective lens (2) and the first zoom lens (3) are meniscus lenses with convex surfaces facing an object; the second variable power lens (4) is a biconvex lens; the focusing lens (6) is a meniscus lens with a convex surface facing the scanning galvanometer (10).
4. The large-area-array double-field-of-view medium wave infrared scanning optical system according to claim 1, characterized in that 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 reflector (5); the third rear group lens (9) is a double-concave 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-field-of-view medium wave infrared scanning optical system according to claim 1, characterized in that the power distribution of the first primary objective lens (1), the second secondary objective lens (2), the first zoom lens (3), the second zoom lens (4) and the focusing lens (6) is a positive-negative-positive-negative structure in sequence.
6. The large-area-array double-field-of-view medium wave infrared scanning optical system according to claim 1, characterized in that the 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 a positive-negative-positive structure in sequence.
7. The large-area-array double-field-of-view medium wave infrared scanning optical system according to claim 1, characterized in that the lens materials of the first main objective lens (1), the first variable power lens (3), the second variable power lens (4), the first rear group lens (7), the second rear group lens (8) and the fourth rear group lens (11) are monocrystalline silicon.
8. The large-area-array double-field-of-view medium wave infrared scanning optical system according to claim 1, characterized in that the lens materials of the secondary objective lens (2), the focusing lens (6) and the third rear group lens (9) are single crystal germanium.
9. The large-area-array double-field-of-view medium wave infrared scanning optical system as claimed in claim 1, characterized in that an imaging light beam from an object space can be matched with a large-area-array infrared detector after passing through a fourth rear group lens (11); the large-area array infrared detector is a refrigeration type medium wave infrared detector, and a cold diaphragm of the refrigeration type medium wave infrared detector can be overlapped with an aperture diaphragm of the optical system, so that the requirement of 100% cold diaphragm efficiency of the refrigeration type infrared optical system is met.
10. The large-area-array double-field-of-view medium wave infrared scanning optical system according to claim 1, characterized in that the scanning galvanometer (10) is placed at an angle of 45 degrees with the optical path, when the scanning galvanometer (10) is in a locked state, the system works in a gaze tracking mode, and in a zooming process, distortion of a long-focus working state is 1.5%, and 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 carried out through a scanning galvanometer (10), and the system works in a scanning search mode.
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