CN116381921A - Large-area array long-wave non-refrigeration type infrared double-view-field scanning optical system - Google Patents
Large-area array long-wave non-refrigeration type infrared double-view-field scanning optical system Download PDFInfo
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- 230000003287 optical effect Effects 0.000 title claims abstract description 82
- 238000005057 refrigeration Methods 0.000 title claims abstract description 29
- 238000003384 imaging method Methods 0.000 claims abstract description 19
- 230000003068 static effect Effects 0.000 claims abstract description 3
- 229910052732 germanium Inorganic materials 0.000 claims description 16
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 16
- 230000005499 meniscus Effects 0.000 claims description 16
- 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 4
- 210000001747 pupil Anatomy 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000010354 integration Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
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- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
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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
- G02B15/14—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
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/001—Eyepieces
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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
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
- G02B27/0031—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration for scanning purposes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a large area array long wave non-refrigeration type infrared double-view-field scanning optical system, which sequentially comprises the following components from an object surface to an image surface: telescope assembly, scanning mirror and focusing mirror assembly. The double-view-field zooming is realized by moving the zoom group in the telescope assembly along the optical axis direction, and the image quality compensation of different working temperatures and the imaging definition of different object distances are realized by axially fine-tuning the zoom group. And a scanning reflector is added in a parallel light path emitted by the telescope assembly, and swings to compensate an azimuth view angle changed by rotation of an azimuth turntable, so that an imaging position of an image in one view field is kept static within integration time, and the stable and clear image of an optical system during rotary scanning is realized without the phenomena of blurring and dragging. The non-refrigeration type large area array detector is adapted, the field of view is increased in a long-focus state, and meanwhile, the detection performance of a remote target is improved. The optical system can keep good image quality during fixation and scanning imaging.
Description
Technical Field
The invention relates to the field of infrared optical scanning, in particular to a large-area array long-wave non-refrigeration type infrared double-view-field scanning optical system.
Background
The infrared searching and tracking system is a passive infrared detection system. Under the condition of background radiation and other interference, the system can complete detection, positioning and continuous tracking of targets, has stronger maneuverability and good concealment, and is widely applied to the carrier-borne, airborne and vehicle-mounted fields.
The traditional infrared searching and tracking system is line scanning imaging, a scanning mechanism is required to be introduced, so that light rays with different fields of view are converged to a target surface of a line detector for imaging, and the infrared searching and tracking system has the advantages of large volume, complex structure and difficult adjustment. With the development of infrared detectors, area array detectors are gradually applied to infrared search tracking systems. Compared with linear array scanning imaging, the planar array scanning is easier to realize positioning and tracking of a heavy point area during variable speed scanning. The difficulty of area array scanning is that during scanning, the image in one field of view can generate relative motion between the focal plane and the image in the integral time, so that image smear and blurring are caused.
The longer the focal length of the optical system, the farther the target is acted upon, but the field of view is reduced. The large-area array detector can effectively neutralize contradiction between the focal length and the view field of the optical system, so that the acting distance and panoramic scanning efficiency of the optical system are improved.
Although the refrigeration type area array detector has high precision and small error, the refrigeration type area array detector has the problems of large volume, high cost, high blind pixel rate and the like, so the refrigeration type area array detector is limited in use; the uncooled area array detector has been widely used in some fields with low sensitivity requirements due to the advantages of low cost, low blind pixel rate, stable performance and the like. The adoption of the large-area-array uncooled detector can more easily realize miniaturization, light weight and batch of the optical system.
Patent document 1 (publication number: CN112558272 a) discloses a medium-wave refrigeration line scanning optical system, which realizes double-view zooming by adopting a switching zoom mode, and has two working modes of searching and tracking, wherein the F number of the system is 2.0, the working wave band is 7.9-10.5 μm, and the focal length of the system is 280mm or 140mm.
Patent document 2 (publication number: CN 110119022A) discloses a medium wave refrigeration area array scanning optical system, which realizes double-view field zooming in an axial zoom mode, and has two working modes of searching and tracking, wherein the F number of the system is 2.0-5.5, the F/# of the system is 7.9-10.5 mu m, the focal length of the system is 180mm or 73mm, the pixel number of a detector is 640 multiplied by 512, and the pixel is 15 mu m.
Patent document 3 (publication No. CN 108008529B) discloses a roll-over medium wave two-shift infrared optical system. The optical system has F number of 2.0, working wave band of 3.7-4.8 μm, focal length of 400mm or 100mm, and can be used with medium wave refrigerating infrared detector with pixel number of 320×256, 30 μm and 640×512, 15 μm. The patent has the advantages of less lenses and high system transmittance, but does not have two working modes of searching and tracking.
Patent document 4 (publication No. CN110749986 a) discloses an infrared continuous zoom area array scanning optical system. The optical system has F number of 4.0, working wave band of 3.7-4.8 μm, system focal length of 60-360 mm, and can be used in combination with medium wave refrigerating infrared detector with pixel number of 640×512 and 15 μm, and has two working modes of searching and tracking.
Patent document 5 (publication No. CN112114425 a) discloses a scanning type medium wave infrared optical system. The F number of the optical 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 optical system can be matched with a medium wave refrigeration infrared detector with 640 multiplied by 512 pixels and 25 mu m. The patent has two working modes of searching and tracking, but is a monoscopic focusing system.
Therefore, the infrared array scanning optical system reported at present mostly adopts a medium wave refrigeration infrared detector, and has large volume and high cost; most of optical systems are designed in continuous zooming or monoscopic fixed focusing, the number of lenses of the optical systems is large, the transmittance of the optical systems is low, and the remote detection performance is limited to a great extent; and the large area array detector is not supported, so that the scanning efficiency of the scanning optical system is lower.
Disclosure of Invention
In order to solve the problems, the invention provides a design scheme of a high-resolution large-area array long-wave non-refrigeration type infrared double-view-field scanning optical system, and a backswing compensation technology of a scanning reflector is used for ensuring that a scene image is kept static relative to a device in the staring integration time of the device in the scanning process. In addition, through the double-view field design, a larger observation view field can be provided during searching so as to conveniently capture suspected targets, and after the targets are found, the targets can be rapidly switched to a working state with small view field and high resolution so as to be identified and tracked. The requirements of detecting targets and identifying different spatial resolutions and fields of view in application can be better met.
The technical scheme of the invention is as follows:
according to the large-area array long-wave non-refrigeration type infrared double-view-field scanning optical system, the optical system is sequentially arranged along the propagation direction of light rays: a telescope objective lens assembly a, a telescope eyepiece lens assembly b, a scanning mirror 8, a focusing mirror assembly c and a detector. Light rays incident from the object space are collimated by the telescope objective lens assembly a and the telescope eyepiece assembly b and then become parallel light beams, and the parallel light beams enter the focusing mirror assembly c after being turned by the scanning reflector 8, and are imaged on the image surface of the detector;
the variable magnification group 2 moves along the optical axis, and when the variable magnification group is close to the position of the front fixed group 1, the optical system is in a large view field mode; when the optical system is close to the position of the rear fixed group, the optical system is in a small view field mode, and double view field switching of the optical system is realized through movement of the zoom group 2 at two positions. The micro-movement of the zoom group 2 along the optical axis direction can compensate the image plane drift of the optical system in different working temperature ranges of-40 ℃ to +60 ℃, so as to realize mechanical compensation and athermalization, and ensure good imaging quality; the zoom group 2 can also realize focusing functions of different object distances by micro-movement along the optical axis direction, and the clear imaging range of the optical system covers 15 meters to infinity;
the incident view field of the telescope objective lens assembly a is W1, and the caliber of an incident light beam is D1; the emergent view field of the telescope eyepiece component b is W2, and the caliber of an emergent light beam is D2; the magnification of the telescope assembly is Γ=w2/w1=d1/D2;
the scanning mirror 8 is located at the exit pupil position in the parallel optical path of the telescope assembly where the converging parallel light beams are narrowest and the scanning mirror 8 has the smallest size. The scanning reflector 8 is placed at 45 degrees with the optical axis, and the parallel light beams emitted by the telescope assembly enter the focusing mirror assembly c to be imaged on the detector after being turned by 90 degrees through the scanning reflector 8. When the scanning reflector 8 is in a fixed state, the optical system realizes gaze imaging and is applied to a tracking mode; when the scanning reflector 8 is in a swinging state, the optical system realizes scanning imaging and is applied to a searching mode;
the swing angular speed of the scanning reflector 8 is omega, the angular speed of the turntable is omega, omega=MΩ/2, the compensation of the azimuth angle of view changed by the rotation of the turntable can be realized, the imaging position of an image in one view field is kept still in the integral time, the stable and clear image of the optical system during the rotary scanning is realized, the phenomena of blurring and dragging are avoided, and the time required for scanning for one circle is 4s;
the telescope objective lens assembly a consists of a front fixed group 1, a variable magnification group 2, a rear fixed group first lens 3 and a rear fixed group second lens 4. The front fixed group 1 is a meniscus germanium lens with positive power bent toward the image side, and its rear surface is an aspherical surface. The variable power group 2 is a biconcave germanium lens with negative focal power, and the front surface of the biconcave germanium lens is an aspheric surface. The rear fixed group first lens 3 is a meniscus germanium lens of positive power bent toward the image side. The rear fixed group second lens 4 is a meniscus zinc selenide lens with positive focal power bent toward the image side, and the rear surface thereof is an aspherical surface.
The telescope eyepiece component b consists of a telescope eyepiece first lens 5, a telescope eyepiece second lens 6 and a telescope eyepiece third lens 7. The first lens 5 of the telescopic eyepiece is a meniscus zinc selenide lens with negative focal power bent to the object, and the rear surface of the lens is an aspheric surface. The telescopic eyepiece second lens 6 is a negative power meniscus germanium lens bent to the object. The third lens 7 of the telescopic eyepiece is a meniscus germanium lens with negative focal power bent to the object side.
The scanning mirror 8 is K9 glass.
The focusing lens assembly c is composed of a focusing first lens 9, a focusing second lens 10 and a focusing third lens 11. The focusing first lens 9 is a meniscus germanium lens with positive power bent toward the image side, and the front surface thereof is an aspherical diffraction surface. The focusing second lens 10 is a biconvex IG6 lens of positive power, the front surface of which is aspherical. The focusing third lens 11 is a meniscus germanium lens with positive power bent toward the image side, and the front surface thereof is an aspherical surface.
The pixel number of the detector is 1024 multiplied by 768, and the detector can be downward compatible with uncooled focal plane detectors with various specifications, and is applicable to the wavelength of 8-13 mu m.
The focal length of the system in the small view field mode is f 1 The focal length in the large view field mode is f 2 Variable power ratio ζ=f of system 1 /f 2 The variable-magnification ratio range of the system is more than or equal to 1 and less than or equal to xi and less than or equal to 3, and the F# range of the system is more than or equal to 1 and less than or equal to F# -1.2.
The focal length of the telescope objective lens assembly a is a1, the focal length of the telescope eyepiece lens assembly b is b1, and the focal length of the focusing lens assembly c is c1 in the small view field mode, f 1 A1, b1, c1 satisfy the relation: 0.7-0.1/f 1 |≤1，0.17≤|b1/f 1 |≤0.5，0.15≤|a1/f 1 |≤0.5。
The focal length of the telescope objective lens assembly a is a2, the focal length of the telescope eyepiece lens assembly b is b2, and the focal length of the focusing lens assembly c is c2 in the large view field mode, f 2 A2, b2, c2 satisfy the relation: 0.7-0.2/f 2 |≤1，0.17≤|b2/f 2 |≤0.65，0.18≤|a2/f 2 |≤0.65。
The beneficial effects of the invention are as follows:
the invention comprises a keplerian telescope system, a scanning reflector and a focusing optical system from an object space to an image space. By adopting the modularized design, each module assembly can be independently assembled and tested, thereby being convenient and quick to position and solve the problem. The size view field switching is realized by axially moving the zoom group, and the fine adjustment of the zoom group realizes image quality compensation at the working temperature of-40 ℃ to +60 ℃ and imaging definition in the focusing range. In the scanning process, aberration caused by the reciprocating motion of the scanning reflecting mirror is reduced, image registration in the whole view field range is realized, the phenomena of blurring and smear are eliminated, and the image is kept stable and clear.
Drawings
FIG. 1 is a large area array long wave non-refrigeration type infrared double-view-field scanning optical system large-view-field light path diagram; wherein:
an a-telescope objective lens component, a b-telescope eyepiece component, an 8-scanning reflector and a c-focusing lens component; the telescope objective lens assembly a comprises a 1-fixed group, a 2-variable magnification group, a 3-rear fixed group first lens and a 4-rear fixed group second lens; the eyepiece component b comprises a first 5-telescope eyepiece lens, a second 6-telescope eyepiece lens, and a third 7-telescope eyepiece lens; the focusing lens assembly c focuses the first lens 9-focus, the second lens 10-focus, and the third lens 11-focus.
Fig. 2 is a diagram of a small field optical path of a large area array long wave non-refrigeration type infrared double field scanning optical system.
Fig. 3 is a field curvature and distortion diagram of an optical system, wherein fig. 3 (a) is a field curvature and distortion diagram of a large field of view, and fig. 3 (b) is a field curvature and distortion diagram of a small field of view.
Detailed Description
The invention will now be further described with reference to examples, figures:
fig. 1, fig. 2, fig. 1 and fig. 2 show structural schematic diagrams and optical schematic diagrams of a preferred embodiment of a large-area array long-wave non-refrigeration type infrared dual-view scanning optical system designed by the invention. The F/# of the optical system is 1.1, the working wave band is 8-12 mu m, the working temperature is-40 ℃ to +60 ℃, the short focal length of the system is f1=72.2 mm, the length Jiao Jiaoju is f2=158 mm, and the optical zoom ratio is 2.2 times. The number of pixels of the adapted uncooled detector is 1024 x 768.
The optical system parameter table (unit: mm) is shown in Table 1.
TABLE 1
TABLE 2
Wherein: the zoom position parameter Z is shown in table 3.
TABLE 3 Table 3
| Zoom position | Focal length 72mm | Focal length 158mm |
| Z1 | 42 | 86.35 |
| Z2 | 49.55 | 5.2 |
The MTF values of the large field of view at the operating temperature of 20 ℃, -40 ℃ and 60 ℃ and the root mean square radius values of the diffuse spots when the scanning mirror is positioned at 45 ℃ are shown in Table 4.
TABLE 4 Table 4
The MTF values for the large field of view and the root mean square radius values for the diffuse spots for the scan mirror at 41.85 ° and 48.15 ° are shown in table 5.
TABLE 5
The MTF values of the small field of view at the operating temperature of 20 ℃, -40 ℃ and 60 ℃ and the root mean square radius values of the diffuse spots are shown in Table 6 when the scanning mirror is positioned at 45 ℃.
TABLE 6
The MTF values of the small field of view and the root mean square radius values of the diffuse spots for the scan mirror at 41.85 ° and 48.15 ° are shown in table 7.
TABLE 7
The MTF and the diffuse spots of the large-area array long-wave non-refrigeration type infrared double-view-field scanning optical system are shown in tables 4-7, the MTF under two modes of scanning searching and staring tracking are in the range of the working temperature of-40 ℃ to +60 ℃, and the MTF on the axis is more than 0.37 when the space cut-off frequency is 42cycles/mm in the range of the full view field, and the imaging quality is good, and is close to the diffraction limit. And in the full view field range, the root mean square radius RMS of the diffuse speckles is smaller than 13um, the resolution is high, and the image is clear. The large-area array long-wave non-refrigeration type infrared double-view-field scanning optical system has the advantages that field curvature and distortion diagrams of a large view field are shown in fig. 3 (a), field curvature and distortion diagrams of a small view field are shown in fig. 3 (b), the distortion of the maximum view field is less than 2%, and obvious bending phenomenon can not occur under the deformation of an edge view field.
While the invention has been described in connection with specific embodiments thereof, it is to be understood that the invention is not limited to the precise form and details of construction illustrated herein.
Claims (10)
1. The large area array long wave non-refrigeration type infrared double-view-field scanning optical system is characterized in that: a telescope objective lens component (a), a telescope eyepiece lens component (b), a scanning reflector (8), a focusing lens component (c) and a detector image surface are sequentially arranged from an object space to an image space along the propagation direction of light rays;
light rays entering from the object are collimated by the telescope objective lens assembly (a) and the telescope eyepiece assembly (b) and then become parallel light beams, and the parallel light beams enter the focusing lens assembly (c) after being turned by the scanning reflector (8) and are imaged on the image surface of the detector;
the telescope objective lens component (a) and the telescope eyepiece component (b) form a telescope component;
the telescope objective lens component (a) consists of a front fixed group (1), a variable magnification group (2), a rear fixed group first lens (3) and a rear fixed group second lens (4); the telescope eyepiece component (b) consists of a telescope eyepiece first lens (5), a telescope eyepiece second lens (6) and a telescope eyepiece third lens (7); the focusing lens assembly (c) consists of a focusing first lens (9), a focusing second lens (10) and a focusing third lens (11);
the zoom group (2) moves along the optical axis, and when the zoom group is close to the position of the front fixed group (1), the optical system is in a large view field mode; when the front fixed group (1) is far away from the position, the optical system is in a small view field mode, and the double view field zooming of the optical system is realized through the movement of the zoom group (2) at two positions;
the scanning reflector (8) is positioned at the exit pupil position in the parallel light path of the telescope assembly, the scanning reflector (8) is placed at an angle of 45 degrees with the optical axis, and the parallel light beams emitted by the telescope assembly enter the focusing mirror assembly (c) for imaging on the detector after being turned by 90 degrees through the scanning reflector (8).
The micro-movement of the zoom group (2) along the optical axis direction can compensate the image plane drift of the optical system in different working temperature ranges of-40 ℃ to +60 ℃, so as to realize mechanical compensation and athermalization, and ensure good imaging quality; the zoom group (2) moves slightly along the optical axis direction to realize the focusing function of different object distances, and the clear imaging range of the optical system covers 15 meters to infinity.
2. The large area array long wave non-refrigeration type infrared double-view-field scanning optical system according to claim 1, wherein the optical system is characterized in that:
the front fixed group (1) is a meniscus germanium lens with positive focal power bent to an image space, and the rear surface of the front fixed group is an aspheric surface;
the variable magnification group (2) is a biconcave germanium lens with negative focal power, and the front surface of the biconcave germanium lens is an aspheric surface;
the rear fixed group first lens (3) is a meniscus germanium lens with positive focal power bent towards the image space;
the second lens (4) of the rear fixed group is a meniscus zinc selenide lens with positive focal power bent towards the image space, and the rear surface of the second lens is an aspheric surface.
3. The large area array long wave non-refrigeration type infrared double-view-field scanning optical system according to claim 1, wherein the optical system is characterized in that:
the first lens (5) of the telescope is a meniscus zinc selenide lens with negative focal power bent to the object space, and the rear surface of the first lens is an aspheric surface;
the second lens (6) of the telescope is a meniscus germanium lens with negative focal power bent to the object space;
the third lens (7) of the telescope is a meniscus germanium lens with negative focal power bent to the object space.
4. The large area array long wave non-refrigeration type infrared double-view-field scanning optical system according to claim 1, wherein the optical system is characterized in that:
the focusing first lens (9) is a meniscus germanium lens with positive focal power bent towards an image space, and the front surface of the focusing first lens is an aspheric diffraction surface;
the focusing second lens (10) is a biconvex IG6 lens with positive focal power, and the front surface of the focusing second lens is an aspheric surface;
the focusing third lens (11) is a meniscus germanium lens with positive focal power bent to the image side, and the front surface of the focusing third lens is an aspheric surface.
5. The large area array long wave non-refrigeration type infrared double-field scanning optical system according to any one of claims 1 to 4, wherein:
when the scanning reflector (8) is in a fixed state, the optical system realizes gaze imaging and is applied to a tracking mode; when the scanning mirror (8) is in a swinging state, the optical system realizes scanning imaging and is applied to a searching mode.
6. The large area array long wave non-refrigeration type infrared double-field scanning optical system according to any one of claims 1 to 4, wherein:
the telescope objective lens component (a) has an incident view field of W1 and an incident beam caliber of D1; the emergent view field of the telescope eyepiece component (b) is W2, and the caliber of an emergent light beam is D2; the telescope assembly has a magnification Γ=w2/w1=d1/D2.
7. The large area array long wave non-refrigeration type infrared double-field scanning optical system according to any one of claims 1 to 4, wherein:
the swing angular speed of the scanning reflector (8) is omega, the angular speed of the turntable is omega, omega=MΩ/2 is used for realizing the compensation of the azimuth angle of view changed by the rotation of the turntable, and is used for ensuring that the imaging position of an image in one view field is kept static in the integral time, so that the image is stable and clear without blurring and smear when the optical system rotates and scans.
8. The large area array long wave non-refrigeration type infrared double-field scanning optical system according to any one of claims 1 to 4, wherein:
the focal length of the system in the small view field mode is f 1 The focal length in the large view field mode is f 2 Variable power ratio ζ=f of system 1 /f 2 The variable-magnification ratio range of the system is more than or equal to 1 and less than or equal to xi and less than or equal to 3, and the F# range of the system is more than or equal to 1 and less than or equal to F# -1.2.
9. The large area array long wave non-refrigeration type infrared double-view-field scanning optical system according to claim 8, wherein the optical system is characterized in that:
the focal length of the telescope objective lens component (a) is a1, the focal length of the telescope eyepiece component (b) is b1, and the focal length of the focusing lens component (c) is c1 in the small view field mode, f 1 A1, b1, c1 satisfy the relation: 0.7-0.1/f 1 |≤1，0.17≤|b1/f 1 |≤0.5，0.15≤|a1/f 1 |≤0.5。
10. The large area array long wave non-refrigeration type infrared double-view-field scanning optical system according to claim 8, wherein the optical system is characterized in that:
the focal length of the telescope objective lens component (a) is a2, the focal length of the telescope eyepiece component (b) is b2, and the focal length of the focusing lens component (c) is c2 in the large view field mode, f 2 A2, b2, c2 satisfy the relation: 0.7-0.2/f 2 |≤1，0.17≤|b2/f 2 |≤0.65，0.18≤|a2/f 2 |≤0.65。
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