CN112305739B - Infrared dual-band imaging optical system combining common optical path wide and narrow fields of view - Google Patents
Infrared dual-band imaging optical system combining common optical path wide and narrow fields of view Download PDFInfo
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- CN112305739B CN112305739B CN202011318132.0A CN202011318132A CN112305739B CN 112305739 B CN112305739 B CN 112305739B CN 202011318132 A CN202011318132 A CN 202011318132A CN 112305739 B CN112305739 B CN 112305739B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 65
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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
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
- G02B17/0647—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using more than three curved mirrors
- G02B17/0663—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using more than three curved mirrors off-axis or unobscured systems in which not all of the mirrors share a common axis of rotational symmetry, e.g. at least one of the mirrors is warped, tilted or decentered with respect to the other elements
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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
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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
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
Abstract
The invention discloses an infrared dual-band imaging optical system combining a common-light-path wide-narrow view field, which sequentially comprises an off-axis four-reflection afocal system, a light splitting group and an infrared dual-band fixed focus back group from an object space to an image space; the off-axis four-reflection afocal system comprises four optical elements, and the beam splitting group comprises three spectroscopes which can be respectively cut into and out of the light path; the light beam passes through four optical elements of the off-axis four-reflection afocal system, then enters a beam splitting group to cut into different spectroscopes of a light path, and then reaches a target surface of a detector after infrared dual-band fixed focus, so that a medium-wave infrared narrow view field and long-wave infrared wide view field combined imaging, a medium-wave infrared wide view field and long-wave infrared narrow view field combined imaging and a medium-wave infrared and long-wave infrared narrow view field combined imaging are respectively formed; when the beam splitting group does not cut into the light path by the spectroscope, the long-wave and medium-wave infrared rays reach the target surface of the detector through the group transmission after infrared dual-band focusing, so that the medium-wave infrared and long-wave infrared wide-view field combined imaging is formed.
Description
Technical Field
The invention relates to the technical field of optics, in particular to an infrared dual-band imaging optical system with a common-light-path wide-narrow view field combination.
Background
In the prior art, most of imaging systems of infrared dual-band optical systems are based on fixed focus or zooming structural forms of traditional infrared systems, and medium-wave infrared and long-wave infrared can only be imaged in a certain same view field at the same time, so that dual-band different view field combined imaging cannot be realized, for example: the Chinese patent application (patent publication No. CN 103197407A) proposes a three-gear zoom with a focal length of 460mm/153mm/46mm, which is suitable for a 320X 256 30 micrometer F2.5 refrigeration type medium-wavelength infrared bicolor detector; the optical system disclosed in China (university of Changchun university (natural science edition), 2020, 43 (04): 25-30) adopts a focal plane array of 320×256, and a medium-length wave double-band infrared refrigeration detector with a pixel size of 30 μm to simultaneously receive infrared radiation of a medium-length wave band, the focal length continuously changes within 80-240 mm, and the angle of view is 1.4-4.4 degrees, and the F number is 2.2.
Disclosure of Invention
The invention aims to provide an infrared dual-band imaging optical system with a common optical path and a wide and narrow view field combination, which realizes the combination imaging of different wide and narrow view fields of medium-wave infrared and long-wave infrared while maintaining the compactness of an infrared dual-band detection system.
The technical scheme adopted by the invention for achieving the purpose is as follows:
the invention provides an infrared dual-band imaging optical system combining a common-light-path wide-narrow view field, which sequentially comprises an off-axis four-reflection afocal system, a light splitting group and an infrared dual-band fixed focus back group from an object space to an image space;
the off-axis four-reflection afocal system comprises four optical elements, and the beam splitting group comprises three spectroscopes which can be respectively cut into and out of the light path; the light beam passes through four optical elements of the off-axis four-reflection afocal system, then enters a beam splitting group to cut into different spectroscopes of a light path, and then reaches a target surface of a detector after infrared dual-band fixed focus, so that a medium-wave infrared narrow view field and long-wave infrared wide view field combined imaging, a medium-wave infrared wide view field and long-wave infrared narrow view field combined imaging and a medium-wave infrared and long-wave infrared narrow view field combined imaging are respectively formed;
when the beam splitting group does not cut into the light path by the spectroscope, the long-wave and medium-wave infrared rays reach the target surface of the detector through the group transmission after infrared dual-band focusing, so that the medium-wave infrared and long-wave infrared wide-view field combined imaging is formed.
By adopting the technical scheme, the off-axis four-reflection afocal system comprises:
the primary mirror is off-axis parabolic, and the focal length f of the primary mirror 1 And the aperture D 1 The ratio of (2) is 0.5.ltoreq.f 1 /D 1 ≤0.65；
The secondary mirror is an off-axis hyperboloid, and the focal length f of the secondary mirror 2 And the aperture D 2 The ratio of (2) is 0.7.ltoreq.f 2 /D 2 ≤0.8；
The three mirrors are plane reflecting mirrors and are placed at an included angle of 45 degrees with the horizontal incidence optical axis;
the four mirrors are off-axis paraboloids, and the focal length f of the four mirrors 4 And the aperture D 4 The ratio of 1 to f 4 /D 4 ≤1.2。
With the technical proposal, when each spectroscope of the beam splitting group cuts into the light path, the angle of 45 degrees is formed between each spectroscope and the horizontal incidence optical axis.
By adopting the technical scheme, the infrared dual-band fixed focus rear group comprises a main objective lens group, a meniscus-shaped objective lens, a secondary imaging lens group and a lens with positive focal power and biconvex form, wherein the F number of the lens is matched with that of the infrared dual-color detector, and the imaging is performed in the medium-wave infrared wide-view field and the long-wave infrared wide-view field dual-band under the condition that the light splitting group is not cut in.
The infrared dual-band fixed focus rear group further comprises a turning reflector for totally reflecting medium-wave infrared energy and long-wave infrared energy, the turning reflector is arranged between the main objective lens group and the meniscus objective lens, forms an included angle of 45 degrees with a horizontal incidence optical axis, and turns the horizontal optical axis by 90 degrees.
With the above technical scheme, the secondary imaging lens group includes three lenses sharing an optical axis, the optical power of the lenses is positive, negative and positive respectively, and at least one lens has an aspheric surface.
By adopting the technical scheme, the emergent optical axis and the incident optical axis of the off-axis four-reflection afocal system form an included angle of 90 degrees.
The invention has the beneficial effects that: in the infrared dual-band imaging optical system with the common-light-path wide-narrow view field combination, light beams enter the beam splitting group to cut into different beam splitters of light paths after passing through four optical elements of the off-axis four-reflection afocal system, and then the light beams respectively form a middle-wave infrared narrow view field and a long-wave infrared wide-view field combination imaging, a middle-wave infrared wide-view field and a long-wave infrared narrow-view field combination imaging and a middle-wave infrared and long-wave infrared narrow-view field combination imaging after infrared dual-band fixed focus; when the beam splitting group is switched into the light path without a spectroscope, the long-wave and medium-wave infrared rays reach the target surface of the detector through the group transmission after infrared dual-band focusing, so that a medium-wave infrared and long-wave infrared wide view field channel is formed, and a medium-wave infrared and long-wave infrared wide view field combined imaging is formed. The whole system has smart light path layout, the wave band and the view field of the detection channel are changed by switching different light splitting elements, the detection channel is flexible and changeable, and the functions are various; in addition, the refraction and reflection type combined design of the optical system has a compact structure, and meets the requirements of equipment miniaturization and multifunctional integration.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of the optical system of the present patent;
FIG. 2 is a schematic diagram of an optical path of the present patent working mode, wherein a is narrow field mid-wave infrared light, and b is wide field long-wave infrared light;
FIG. 3 is a schematic diagram of a second optical path of the present patent working mode, wherein c is narrow-field long-wave infrared light, and d is wide-field medium-wave infrared light;
FIG. 4 is a schematic diagram of a three-optical path of the patent in the working mode, wherein e is narrow-field mid-wave infrared light and narrow-field long-wave infrared light;
FIG. 5 is a schematic diagram of a four-optical path of the present patent working mode, wherein f is a wide-field mid-wave infrared light and a wide-field long-wave infrared light;
FIG. 6 is a graph of a narrow field of view mid-wave infrared transfer function of the optical system of the present patent;
FIG. 7 is a graph of a wide field of view mid-wave infrared transfer function of the optical system of the present patent;
FIG. 8 is a graph of a narrow field of view long wave infrared transmission function of the optical system of the present patent;
FIG. 9 is a graph of a wide field of view long wave infrared transmission function of the optical system of the present patent.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the optical path schematic diagram of the infrared dual-band imaging optical system with the common optical path and the wide and narrow view field combination shown in fig. 1, the left side is an object side along the light, and the right side is an image side. The invention discloses an infrared dual-band imaging optical system combining common-light-path wide and narrow view fields, which sequentially comprises an off-axis four-reflection afocal system 01, a switchable light splitting group 02 and an infrared dual-band fixed focus back group 03 from an object space to an image space. The beam splitting group 02 adopts a switched beam splitting element mode to realize the combination of two different wave bands of medium wave infrared and long wave infrared and a wide view field and a narrow view field. The switching positions of the light splitting elements of the light splitting group 02 are set to four gears, so that four states of reflection medium wave infrared and transmission long wave infrared, reflection long wave infrared and transmission medium wave infrared, reflection medium wave infrared and reflection long wave infrared and transmission medium wave infrared and transmission long wave infrared can be respectively realized, and the four wide and narrow view field combinations of the medium wave infrared and the long wave infrared are respectively realized correspondingly: mid-wave infrared narrow-field imaging and long-wave infrared wide-field imaging, mid-wave infrared wide-field imaging and long-wave infrared narrow-field imaging, mid-wave infrared narrow-field imaging and long-wave infrared narrow-field imaging, mid-wave infrared wide-field imaging and long-wave infrared wide-field imaging.
The off-axis four-mirror afocal system 01 includes four reflective optical elements, primary mirror 011, secondary mirror 012, tertiary mirror 013, and quaternary mirror 014. The off-axis four-reflection afocal system 01 aims at the double-band beam expansion of the medium-wave infrared and the long-wave infrared, the multiplying power of the beam expansion ratio corresponds to a wide view field and a narrow view field, and is suitable for considering the volume, the searching efficiency and the identification effect, and is 3-4 times generally, wherein a primary mirror 011 is an off-axis paraboloid, and the focal length f of the primary mirror 1 And the aperture D 1 The ratio of (2) is 0.5.ltoreq.f 1 /D 1 Less than or equal to 0.65; the secondary mirror 012 is an off-axis hyperboloid, the secondary mirror focal length f 2 And the aperture D 2 The ratio of (2) is 0.7.ltoreq.f 2 /D 2 Less than or equal to 0.8; the three mirrors 013 are plane mirrors and are placed at an included angle of 45 degrees with the horizontal incidence optical axis; four mirrors 014 are off-axis paraboloids, focal length f of four mirrors 4 And the aperture D 4 The ratio of 1 to f 4 /D 4 Less than or equal to 1.2. The off-axis four-reflection afocal system 01 skillfully folds the light path, the emergent light axis and the incident light axis form an included angle of 90 degrees, and the space size is fully utilized. The off-axis four-reflection afocal system 01 is shared by narrow-view-field medium-wave infrared and narrow-view-field long-wave infrared.
In addition, the beam splitting group 02 in the present invention includes three beam splitting elements, and one beam splitting element can be controlled to be switched at a time to be shifted into the optical path at an angle of 45 ° with respect to the horizontal incident optical axis, and the characteristics of the beam splitting elements of the three cut-in optical paths are respectively: a beam splitter 021 for reflecting and transmitting the medium wave infrared, a beam splitter 022 for reflecting and transmitting the medium wave infrared, and a beam splitter 023 for reflecting and transmitting the medium wave infrared. The cut-in state and the combination of all the three beam splitting groups which are not cut into the light path form four states, so that the wide and narrow view field combinations of four medium wave infrared and long wave infrared are realized, and the three states are respectively as follows: mid-wave infrared narrow-field imaging and long-wave infrared wide-field imaging, mid-wave infrared wide-field imaging and long-wave infrared narrow-field imaging, mid-wave infrared narrow-field imaging and long-wave infrared narrow-field imaging, mid-wave infrared wide-field imaging and long-wave infrared wide-field imaging.
In addition, the infrared dual-band fixed focus rear group 03 in the invention is equivalent to a fixed focus objective lens, and comprises a main objective lens group 031, a meniscus-shaped objective lens three 033, a secondary imaging lens group 034 and a lens seven 035 with positive focal power and double convex form, wherein the F number of the lens seven 035 is matched with that of an infrared dual-color detector, and the medium-wave infrared wide-view field and long-wave infrared wide-view field dual-band imaging is realized under the condition that the light splitting group 02 is not cut in.
In addition, the infrared dual-band fixed focus back group 03 of the invention also comprises a turning mirror 032 which can totally reflect the medium-wave infrared energy and the long-wave infrared energy, and is arranged between the main object lens group 031 of the infrared dual-band fixed focus back group 03 and the meniscus type objective lens three 033, and forms an included angle of 45 degrees with the horizontal incidence optical axis, and the horizontal optical axis is turned by 90 degrees, so that the compactness of the whole optical system is facilitated.
In addition, the secondary imaging lens group 034 includes, in order from the object side, a positive power lens four 0341, a negative power lens five 0342, and a positive power lens six 0343, and at least one surface of the lens of the secondary imaging lens group 034 is aspherical in order to simplify the system, increase the transmittance, and improve the image quality.
The combination of the off-axis four-reflection afocal system 01, the light splitting group 02 and the infrared dual-band fixed focus back group 03 forms an infrared dual-band imaging narrow view field channel; the beam-splitting group 02 and the infrared dual-band fixed focus back group 03 are combined to form an infrared dual-band wide view field channel. When the switchable light splitting group 02 cuts into the spectroscope 021 for reflecting the medium wave infrared transmission long wave infrared, the medium wave infrared is reflected by the off-axis four-reflection afocal system 01, and the switchable light splitting group 02 reflects and the infrared dual-band rear group 03 transmits to reach the target surface of the detector, so that a medium wave infrared narrow view field channel is formed; meanwhile, long-wave infrared is transmitted by the switchable beam splitting group 02 and transmitted by the infrared dual-band rear group 03 to reach the target surface of the detector to form a long-wave infrared wide view field channel, so that combined imaging of a medium-wave infrared narrow view field and a long-wave infrared wide view field is realized, and a light path is shown as an optical path schematic diagram of the working mode I of the figure 1 corresponding to the working mode I.
When the beam splitting group 02 cuts into the spectroscope 022 for reflecting the long-wave infrared transmission medium-wave infrared, the long-wave infrared is reflected by the off-axis four-reflection afocal system 01, and the beam splitting group 02 reflects and the infrared dual-band fixed focus group 03 transmits to reach the target surface of the detector to form a long-wave infrared narrow-view field channel; meanwhile, the medium wave infrared transmits through the switchable beam splitting group 02 and the infrared dual-band fixed focus group 03 to reach the target surface of the detector to form a medium wave infrared wide view field channel, so that combined imaging of the medium wave infrared wide view field and the long wave infrared narrow view field is realized, and a light path is shown as a schematic diagram of a second optical path of the working mode of the second optical path of the figure 2.
When the switchable beam splitting group 02 cuts into the spectroscope 023 for reflecting the middle-wave infrared reflection long-wave infrared, the long-wave infrared and the middle-wave infrared are reflected by the off-axis four-reflection afocal system 01, the beam splitting group 02 reflects and the infrared dual-band fixed focus is transmitted by the group 03 to reach the target surface of the detector, so that a middle-wave infrared and long-wave infrared narrow view field channel is formed, the combined imaging of the middle-wave infrared and the long-wave infrared narrow view field is realized, the three optical paths of the three optical paths are shown in a three-optical path schematic diagram of the working mode of figure 3 corresponding to the three working mode.
When the switchable beam splitting group 02 cuts into the transmission medium wave infrared transmission long wave infrared spectroscope (neutral position corresponds to the optical paths cut out by the spectroscopes 021, 022 and 023 in the beam splitting group 02), the long wave and medium wave infrared reach the target surface of the detector through the transmission of the infrared dual-band fixed focus group 03, a medium wave infrared and long wave infrared wide view field channel is formed, the combination imaging of the medium wave infrared and the long wave infrared wide view field is realized, the optical paths are shown as four optical path diagrams of the working mode of figure 4.
The specific design parameters of this optical system example 1 are shown in table 1.
Table 1 the optical system design parameter table of embodiment 1
In table 1, the radius of curvature refers to the radius of curvature of each lens surface, the thickness or spacing refers to the lens thickness or the distance between adjacent lens surfaces, the material is the material used for the lenses, and air refers to the medium between the two lenses being air. * The numbers in column 2 of the table represent the surface numbers of the lenses, for example, 5 and 6 represent the front and rear surfaces of the lenses cut into the optical path each time by the beam splitting group 02.
In order to obtain better image quality of the optical system, three aspheric surfaces are used in the off-axis four-reflection afocal system and are respectively positioned on the first primary mirror 011, the second secondary mirror 012 and the fourth reflecting mirror 014; the infrared dual band fixed focus back group uses an aspheric design, which is the second side of the fourth lens 0341, whose aspheric coefficients are shown in table 2.
Table 2 use of aspherical coefficients in specific examples
The aspherical equation is defined as follows:
finally, it should be noted that: the present invention is not limited to the above-described embodiments, and it will be understood by those skilled in the art that modifications and equivalents may be made without departing from the spirit of the invention.
Fig. 6 to 9 are diagrams of simulation data of optical transfer functions of the optical system of the present invention. Wherein: FIG. 6 is a graph of the transfer function of a narrow field of view mid-wave infrared channel at 20 lp/mm; FIG. 7 is a graph of the transfer function of a wide field of view mid-wave infrared channel at 20 lp/mm; FIG. 8 is a graph of the transfer function of a narrow field long wave infrared channel at 20 lp/mm; FIG. 9 is a graph of the transfer function of a wide field of view long wave infrared channel at 20 lp/mm.
In summary, compared with the current mainstream infrared dual-wave imaging optical system, the technical advantages of the infrared dual-wave imaging optical system combined by the common-path wide-narrow view field are mainly represented in three aspects: (1) The method improves the adaptability to complex environments, can simultaneously obtain the infrared radiation information of two atmosphere windows of medium wave and long wave with different wide and narrow view field combinations, has the advantages of medium wave infrared imaging and long wave infrared imaging detection, and can obtain more effective information of the target by utilizing inherent and stronger difference and complementarity of the target in images of different infrared wave bands. The characteristics of high medium wave resolution and high long wave detection sensitivity are fully exerted, and the adaptability of the infrared optical system to complex environments is greatly improved; (2) The efficiency is improved, the detection and identification success rate of targets is improved, four different wide and narrow view fields of medium-wave infrared imaging and long-wave infrared imaging are combined, the capability of synchronously acquiring separation wave band information by a double-wave-band focal plane detector is fully utilized, the medium-wave infrared imaging and long-wave infrared imaging device has the synchronous detection function of respectively using different wide and narrow view fields, an operator does not need to repeatedly zoom and search and identify interested targets between the wide view field and the narrow view field, the efficiency of a searching and tracking system is effectively improved, the time for establishing tracking is reduced, the tracking precision is improved, the false alarm rate is reduced, and the like; (3) The layout is compact, and the miniaturization and the multifunction design are facilitated. The system has smart light path layout, the wave band and the view field of the detection channel are changed by switching different light splitting elements, the detection channel is flexible and changeable, and the functions are various; the refraction and reflection type combined design of the optical system has compact structure and meets the requirements of equipment miniaturization and multifunctional integration.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (6)
1. The infrared dual-band imaging optical system with the common-path wide-narrow view field combination is characterized by sequentially comprising an off-axis four-reflection afocal system (01), a beam splitting group (02) and an infrared dual-band fixed focus rear group (03) from an object space to an image space;
the off-axis four-reflection afocal system (01) comprises four optical elements, and the beam splitting group (02) comprises three beam splitters which can respectively cut in and out light paths; the light beam passes through four optical elements of an off-axis four-reflection afocal system (01) and then enters a beam splitter group (02) to cut into different spectroscopes of a light path, and then reaches a target surface of a detector through an infrared dual-band fixed focus group (03) to form a medium-wave infrared narrow view field and long-wave infrared wide view field combined imaging, a medium-wave infrared wide view field and long-wave infrared narrow view field combined imaging and a medium-wave infrared and long-wave infrared narrow view field combined imaging respectively; the light splitting group (02) comprises a spectroscope (021) for reflecting the middle wave infrared ray and transmitting the long wave infrared ray, a spectroscope (022) for reflecting the long wave infrared ray and transmitting the middle wave infrared ray, and a spectroscope (023) for reflecting the middle wave infrared ray and the long wave infrared ray;
an infrared dual-band fixed focus rear group (03) which is equivalent to a fixed focus objective lens and comprises a main objective lens group (031), a meniscus-shaped objective lens (033), a secondary imaging lens group (034) and a lens (035) with positive focal power and double convex shape, wherein the F number of the lens is matched with that of an infrared dual-color detector; when the beam splitting group (02) does not have a spectroscope to cut into a light path, long-wave and medium-wave infrared rays are transmitted to a target surface of the detector through the infrared dual-band fixed focus rear group (03), so that a combined image of the medium-wave infrared rays and the long-wave infrared wide-view field dual-band is formed.
2. The infrared dual-band imaging optical system of a common-path wide-narrow field-of-view combination according to claim 1, characterized in that the off-axis four-reflection afocal system (01) comprises:
the primary mirror (011) is an off-axis paraboloid, and the focal length of the primary mirrorf 1 And the aperture D 1 Ratio of (2)；
The secondary mirror (012) is off-axis hyperboloid, and the focal length of the secondary mirrorf 2 And the aperture D 2 Ratio of (2)；
The three mirrors (013) are plane mirrors and are placed at an included angle of 45 degrees with the horizontal incidence optical axis;
four mirrors (014) are off-axis paraboloids, four mirrors focal lengthsf 4 And the aperture D 4 Ratio of (2)。
3. The infrared dual-band imaging optical system of claim 1, wherein each beam splitter of the beam splitter group (02) forms an angle of 45 ° with the horizontal incident optical axis when cutting into the optical path.
4. The infrared dual-band imaging optical system of a common-path wide-narrow field of view combination according to claim 1, characterized in that the infrared dual-band fixed focus back group (03) further comprises a turning mirror (032), which is placed between the main objective lens group (031) and the meniscus objective lens (033) and makes an angle of 45 ° with the horizontal incident optical axis, turning the horizontal optical axis by 90 °.
5. The infrared dual band imaging optical system of claim 1, wherein the secondary imaging lens group (034) comprises three lenses sharing an optical axis, the optical power of which is positive, negative, positive, respectively, and at least one lens has an aspherical surface.
6. A common-path wide-narrow-field combined infrared dual-band imaging optical system according to any one of claims 1-3, characterized in that the exit optical axis of the off-axis four-reflection afocal system is at an angle of 90 ° to the entrance optical axis.
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| CN117170078B (en) * | 2023-11-02 | 2024-01-12 | 中国科学院长春光学精密机械与物理研究所 | Reflection type zoom afocal optical system |
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