Long-exit-pupil-distance broadband common-aperture composite simulation optical system

Abstract

The utility model provides a long-exit-pupil-distance broadband common-aperture composite simulation optical system, and belongs to the technical field of target scene composite analog simulation. A broadband objective lens group A, a space beam combiner group B and a long-wave infrared projection lens group D are sequentially arranged in the optical system from left to right along light, a visible light projection lens group C is located on the upper side of the space beam combiner group B, and a long-wave infrared projection lens group C is located on the lower side of the space beam combiner group B; a visible light image plane is positioned on the right side of the visible light projection lens group C; the medium-wave infrared projection lens group E is located on the lower side of the space beam combiner lens group B, the medium-wave infrared image surface is located on the lower side of the medium-wave infrared projection lens group E, the long-wave infrared image surface is located on the right side of the medium-wave infrared image surface, and the exit pupil position is located on the left side of the broadband objective lens group A; the problem that a single-channel target modulo system only adapts to simulation of imaging guidance equipment of a specific wave band and is not suitable for semi-physical simulation tests of three-mode composite imaging guidance equipment and two-mode composite imaging guidance equipment is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of target scene composite simulation and emulation, and more specifically to a composite simulation optical system with a long exit pupil distance and a wide band and a common aperture. Background Art

[0002] Usually, the scene simulation optical systems working in a single band include visible light simulation optical systems, medium-wave infrared simulation optical systems or long-wave infrared simulation optical systems, that is, the working bands are different, and the designed light simulation optical systems also have different working bands. In order to meet the development requirements of the multi-mode working system of optical imaging guidance equipment, the demand for wide-band co-aperture composite simulation optical systems used in semi-physical simulation and testing is increasing.

[0003] In order to meet the application background of semi-physical simulation test, integrating and co-aperture the simulation scenes of multi-channel and different working bands is one of the key directions of composite simulation application. The wide-band co-aperture composite simulation system can be applied to the simulation test of existing composite imaging guidance equipment (such as visible light / long-wave infrared imaging guidance equipment, infrared two-color imaging guidance equipment), single-mode imaging guidance equipment (such as visible light imaging guidance equipment, medium-wave infrared imaging guidance equipment, long-wave infrared imaging guidance equipment), and can also be applied to the technical testing and verification of visible light / medium-wave infrared imaging guidance equipment, visible light / medium-wave infrared / long-wave infrared imaging guidance equipment and related directions.

[0004] The single-channel target model system is only suitable for the simulation of imaging guidance equipment in a specific band, and is not suitable for semi-physical simulation tests of three-mode composite imaging guidance equipment and two-mode composite imaging guidance equipment.

[0005] In order to solve these problems, a long exit pupil distance, wide band and common aperture composite simulation optical system is provided. Summary of the invention

[0006] The present invention provides a long-exit-pupil-distance, wide-band, common-aperture composite simulation optical system, which can solve the problem that a single-channel target model system is only suitable for simulation of imaging guidance equipment in a specific band and is not suitable for semi-physical simulation tests of three-mode composite imaging guidance equipment and two-mode composite imaging guidance equipment.

[0007] A long-exit-pupil-distance, wide-band, common-aperture composite analog optical system, wherein a wide-band objective lens group A, a spatial beam-combining lens group B, and a long-wave infrared projection lens group D are sequentially arranged along a light beam from left to right in the optical system, a visible light projection lens group C is located on the upper side of the spatial beam-combining lens group B, and a visible light image plane is located on the right side of the visible light projection lens group C; a medium-wave infrared projection lens group E is located on the lower side of the spatial beam-combining lens group B, a medium-wave infrared image plane is located on the lower side of the medium-wave infrared projection lens group E, a long-wave infrared image plane is located on the right side of the medium-wave infrared image plane, and an exit pupil position is located on the left side of the wide-band objective lens group A;

[0008] Image converter 1 is located on the visible light image plane, and the visible light image generated by it is incident on the space beam combining mirror group B through the visible light projection mirror group C and reflected; image converter 2 is located on the long-wave infrared image plane, and the long-wave infrared radiation image generated by it is incident on the space beam combining mirror group B through the long-wave infrared projection mirror group D and transmitted; image converter 3 is located on the medium-wave infrared image plane, and the medium-wave infrared radiation image generated by it is incident on the space beam combining mirror group B through the medium-wave infrared projection mirror group E and reflected; after the visible light image, the long-wave infrared radiation image and the medium-wave infrared radiation image are beam combined with the space beam combining mirror group B at a common aperture, they are collimated into parallel light by the wide-band objective lens group A and output to the exit pupil position of the long exit pupil distance wide-band common aperture composite simulation optical system, simulating the target and scene images with visible light imaging characteristics and long-wave and medium-wave infrared thermal radiation characteristics;

[0009] The wide-band objective lens group A includes a meniscus positive lens 1; the space beam combining lens group B includes a visible light medium-wave beam combining lens and a medium-wavelength beam combining lens; the visible light projection lens group C includes a double concave negative lens 1, a double-cemented positive lens 1, a plane reflector, a double-convex positive lens 1, a double-cemented negative lens 1, a meniscus positive lens 2, a double-cemented negative lens 2, and a double-cemented negative lens 3; the long-wave infrared projection lens group D includes a double-convex positive lens 2, a meniscus positive lens 3, a meniscus negative lens 1, a meniscus negative lens 2, a double-convex positive lens 3, and a meniscus positive lens 4; the medium-wave infrared projection lens group E includes a meniscus positive lens 5, a meniscus positive lens 6, a meniscus positive lens 7, a meniscus negative lens 3, and a double-convex positive lens 4;

[0010] The visible light medium wave beam combiner, medium wavelength beam combiner and plane reflector are all tilted at 45°; the air gap between the wide-band objective lens group A and the visible light medium wave beam combiner in the space beam combiner group B is 539mm; the air gap between the visible light medium wave beam combiner and the medium wavelength beam combiner in the space beam combiner group B is 98.5mm; the air gap between the visible light medium wave beam combiner in the space beam combiner group B and the double concave negative lens 1 in the visible light projection lens group C is 165.5mm; the air gap between the medium wavelength beam combiner in the space beam combiner group B and the double convex positive lens 2 in the long-wave infrared projection lens group D is 51mm; the air gap between the medium wavelength beam combiner in the space beam combiner group B and the meniscus positive lens 5 in the medium-wave infrared projection lens group E is 58mm;

[0011] In the visible light projection lens group C, the air gap between the biconcave negative lens 1 and the double-cemented positive lens 1 is 7.7 mm, the air gap between the double-cemented positive lens 1 and the plane reflector is 92 mm, the air gap between the plane reflector and the biconvex positive lens 1 is 200 mm, the air gap between the biconvex positive lens 1 and the double-cemented negative lens 1 is 1.23 mm, the air gap between the double-cemented negative lens 1 and the meniscus positive lens 2 is 1 mm, the air gap between the meniscus positive lens 2 and the double-cemented negative lens 2 is 6.72 mm, and the air gap between the double-cemented negative lens 2 and the double-cemented negative lens 3 is 1 mm;

[0012] In the long-wave infrared projection lens group D, the air gap between the biconvex positive lens 2 and the meniscus positive lens 3 is 100.5 mm, the air gap between the meniscus positive lens 3 and the meniscus negative lens 1 is 0.95 mm, the air gap between the meniscus negative lens 1 and the meniscus negative lens 2 is 17.6 mm, the air gap between the meniscus negative lens 2 and the biconvex positive lens 3 is 3.25 mm, and the air gap between the biconvex positive lens 3 and the meniscus positive lens 4 is 95.1 mm;

[0013] In the medium-wave infrared projection lens group E: the air gap between the meniscus positive lens five and the meniscus positive lens six is ​​97.35 mm, the air gap between the meniscus positive lens six and the meniscus positive lens seven is 98.48 mm, the air gap between the meniscus positive lens seven and the meniscus negative lens three is 0.86 mm, and the air gap between the meniscus negative lens three and the biconvex positive lens four is 0.95 mm.

[0014] Furthermore, the front surface of the wide-band objective lens group A is spherical, and the rear surface is aspherical; in the long-wave infrared projection lens group D, the front surface of the meniscus positive lens three is aspherical, and the rear surface is spherical; the front surface of the meniscus negative lens two is spherical, and the rear surface is aspherical; the front surface of the biconvex positive lens three is spherical, and the rear surface is a non-spherical surface and a diffraction surface; the biconvex positive lens two, the meniscus negative lens one, and the meniscus positive lens four are spherical lenses; in the medium-wave infrared projection lens group E, the front surface of the meniscus positive lens six is ​​aspherical, and the rear surface is spherical; the front surface of the biconvex positive lens four is spherical, and the rear surface is aspherical; the meniscus positive lens five, the meniscus positive lens seven, and the meniscus negative lens three are spherical lenses.

[0015] Furthermore, the visible light medium-wavelength beam combining mirror and the medium-wavelength beam combining mirror in the spatial beam combining mirror group B both form an angle of 45° with the optical axis; and the plane reflector in the visible light projection mirror group C forms an angle of 45° with the optical axis.

[0016] Furthermore, the operating bands of the long exit pupil distance wide band common aperture composite simulation optical system are 0.55μm~0.75μm, 3μm~5μm, 8μm~12μm, the field of view is 8°×6°, the resolution is 1280×1024, the exit pupil diameters are 35mm@0.55μm~0.75μm, 45mm@3μm~5μm, 70mm@8μm~12μm, the exit pupil distance is 500mm, and the overlap of visible light, medium-wave infrared, and long-wave infrared simulation scenes is 0.006°.

[0017] Beneficial effects:

[0018] 1. It can convert digital image signals into multi-spectral scene optical signals and realize the common-aperture composite analog output of the optical signals, including scene image information of visible light characteristics, medium-wave infrared radiation characteristics, and long-wave infrared radiation characteristics;

[0019] 2. The common aperture wide-band optical path design structure is adopted to achieve high-precision coincidence characteristic simulation of multi-spectral scene images, with a coincidence accuracy of 0.006°;

[0020] 3. The working bands of the examples are 0.55μm~0.75μm, 3μm~5μm, 8μm~12μm, the exit pupil distance is 500mm, the exit pupil diameter is 35mm@0.55μm~0.75μm, 45mm@3μm~5μm, 70mm@8μm~12μm, and the field of view is 8°×6°. It is a composite analog optical system with long exit pupil distance, wide working band and wide field of view.

[0021] 4. The visible light characteristics, medium-wave infrared radiation characteristics, and long-wave infrared radiation characteristics are designed as three-way image conversion sources, which can realize simultaneous operation of a wide band or work separately;

[0022] 5. They can work in pairs to form a common-aperture high-precision composite simulation of visible light / medium-wave scenes, a common-aperture high-precision composite simulation of visible light / long-wave scenes, or a common-aperture high-precision composite simulation of medium-wave / long-wave scenes;

[0023] 6. The example uses a wide-band objective lens group made of multi-spectral zinc sulfide and combines it with a spatial beam combining design to achieve a miniaturized design of a multi-band, long exit pupil distance, and common aperture composite simulation optical system;

[0024] 7. Through the design of long exit pupil distance, it is ensured that the composite simulation simulator or projection device using this optical system can adapt to the working requirements of the five-axis turntable, and the miniaturization design of the composite simulation optical system with long exit pupil distance and wide band common aperture is realized;

[0025] 8. It can be applied to simulation tests of existing and pre-research imaging guidance equipment. For example, it can be applied to simulation tests of composite imaging guidance equipment (such as visible light / long-wave infrared imaging guidance equipment, infrared dual-color imaging guidance equipment), single-mode imaging guidance equipment (such as visible light imaging guidance equipment, medium-wave infrared imaging guidance equipment, long-wave infrared imaging guidance equipment), and can also be applied to technical testing and verification of visible light / medium-wave infrared imaging guidance equipment, visible light / medium-wave infrared / long-wave infrared imaging guidance equipment and related directions. The optical system has certain versatility and applicability, which can greatly improve the working efficiency of simulation equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a composite simulated optical system with a long exit pupil distance and a wide band and a common aperture according to an embodiment;

[0027] Figure 2 is a modulation transfer function curve diagram of the embodiment in the visible light band;

[0028] Figure 3 is a spot diagram of an embodiment in the visible light band;

[0029] Figure 4 The field area and distortion curve diagram of the embodiment in the visible light band;

[0030] Figure 5 is a relative illumination curve diagram of the embodiment in the visible light band;

[0031] Figure 6 is a modulation transfer function curve diagram of the embodiment in the mid-wave infrared band;

[0032] Figure 7 is a spot diagram of the embodiment in the mid-wave infrared band;

[0033] Figure 8 The field area and distortion curve diagram of the embodiment in the mid-wave infrared band;

[0034] Fig. 9 is a relative illumination curve diagram of the embodiment in the mid-wave infrared band;

[0035] Fig.10 is a modulation transfer function curve diagram of the embodiment in the long-wave infrared band;

[0036] Fig.11 is a spot diagram of the embodiment in the long-wave infrared band;

[0037] Fig.12 The field area and distortion curve diagram of the embodiment in the long-wave infrared band;

[0038] Fig.13 It is a relative illumination curve diagram of the embodiment in the long-wave infrared band.

[0039] In the figure: 1-exit pupil; 2-meniscus positive lens 1; 3-visible light medium wave beam combiner; 4-biconcave negative lens 1; 5-double cemented positive lens 1; 6-plane reflector; 7-biconvex positive lens 1; 8-double cemented negative lens 1; 9-meniscus positive lens 2; 10-double cemented negative lens 2; 11-double cemented negative lens 3; 12-visible light image plane; 13-medium wavelength beam combiner; 14-biconvex positive lens 2; 15-meniscus positive lens 3; 16-meniscus negative lens 1; 17-meniscus negative lens 2; 18-biconvex positive lens 3; 19-meniscus positive lens 4; 20-long wave infrared image plane; 21-meniscus positive lens 5; 22-meniscus positive lens 6; 23-meniscus positive lens 7; 24-meniscus negative lens 3; 25-biconvex positive lens 4; 26-medium wave infrared image plane. DETAILED DESCRIPTION

[0040] like Figures 1 to 13 As shown, a long exit pupil distance wide band common aperture composite simulation optical system is characterized in that: the optical system is provided with a wide band objective lens group A, a spatial beam combining lens group B, a visible light projection lens group C, a visible light image plane, a long wave infrared projection lens group D, a long wave infrared image plane 20, a medium wave infrared projection lens group E, and a medium wave infrared image plane 26 in sequence along the light from left to right and from top to bottom.

[0041] Image converter 1 is located on the visible light image plane 12, and the visible light image generated by it is incident on the space beam combining lens group B through the visible light projection lens group C and reflected; image converter 2 is located on the long-wave infrared image plane 20, and the long-wave infrared radiation image generated by it is incident on the space beam combining lens group B through the long-wave infrared projection lens group D and transmitted; image converter 3 is located on the medium-wave infrared image plane 26, and the medium-wave infrared radiation image generated by it is incident on the space beam combining lens group B through the medium-wave infrared projection lens group E and reflected. After the visible light image, the long-wave infrared radiation image, and the medium-wave infrared radiation image are combined by the space beam combining lens group B with a common aperture, they are collimated into parallel light by the wide-band objective lens group A and output to the exit pupil position 1 of the long exit pupil distance wide-band common aperture composite simulation optical system, simulating the target and scene images with visible light imaging characteristics and long-wave and medium-wave infrared thermal radiation characteristics.

[0042] The wide-band objective lens group A includes a meniscus positive lens 2; the spatial beam combining lens group B includes a visible light medium-wave beam combining lens 3 and a medium-wavelength beam combining lens 13; the visible light projection lens group C includes a double concave negative lens 4, a double-cemented positive lens 5, a plane reflector 6, a double-convex positive lens 7, a double-cemented negative lens 18, a meniscus positive lens 29, a double-cemented negative lens 2 10, and a double-cemented negative lens 3 11; the long-wave infrared projection lens group D includes a double-convex positive lens 2 14, a meniscus positive lens 3 15, a meniscus negative lens 1 16, a meniscus negative lens 2 17, a double-convex positive lens 3 18, and a meniscus positive lens 4 19; the medium-wave infrared projection lens group E includes a meniscus positive lens 5 21, a meniscus positive lens 6 22, a meniscus positive lens 7 23, a meniscus negative lens 3 24, and a double-convex positive lens 4 25.

[0043] In this embodiment, the visible light medium wave beam combiner 3, the medium wavelength wave beam combiner 13, and the plane reflector 6 are all inclined at 45°; the air gap between the wide-band objective lens group A2 and the visible light medium wave beam combiner 3 in the space beam combiner group B is 539 mm; the air gap between the visible light medium wave beam combiner 3 and the medium wavelength wave beam combiner 13 in the space beam combiner group B is 98.5 mm; the air gap between the visible light medium wave beam combiner 3 in the space beam combiner group B and the double concave negative lens 1 4 in the visible light projection lens group C is 165.5 mm; the air gap between the medium wavelength wave beam combiner 13 in the space beam combiner group B and the double convex positive lens 2 14 in the long-wave infrared projection lens group D is 51 mm; the air gap between the medium wavelength wave beam combiner 13 in the space beam combiner group B and the meniscus positive lens 5 21 in the medium-wave infrared projection lens group E is 58 mm.

[0044] In this embodiment, in the visible light projection mirror group C: the air gap between the double concave negative lens 4 and the double-cemented positive lens 5 is 7.7 mm, the air gap between the double-cemented positive lens 5 and the plane reflector 6 is 92 mm, the air gap between the plane reflector 6 and the double convex positive lens 7 is 200 mm, the air gap between the double convex positive lens 7 and the double-cemented negative lens 8 is 1.23 mm, the air gap between the double-cemented negative lens 8 and the meniscus positive lens 2 9 is 1 mm, the air gap between the meniscus positive lens 2 9 and the double-cemented negative lens 2 10 is 6.72 mm, and the air gap between the double-cemented negative lens 2 10 and the double-cemented negative lens 3 11 is 1 mm.

[0045] In this embodiment, in the long-wave infrared projection lens group D: the air gap between the biconvex positive lens 2 14 and the meniscus positive lens 3 15 is 100.5 mm, the air gap between the meniscus positive lens 3 15 and the meniscus negative lens 1 16 is 0.95 mm, the air gap between the meniscus negative lens 1 16 and the meniscus negative lens 2 17 is 17.6 mm, the air gap between the meniscus negative lens 2 17 and the biconvex positive lens 3 18 is 3.25 mm, and the air gap between the biconvex positive lens 3 18 and the meniscus positive lens 4 19 is 95.1 mm.

[0046] In this embodiment, in the medium-wave infrared projection lens group E: the air gap between the meniscus positive lens five 21 and the meniscus positive lens six 22 is 97.35 mm, the air gap between the meniscus positive lens six 22 and the meniscus positive lens seven 23 is 98.48 mm, the air gap between the meniscus positive lens seven 23 and the meniscus negative lens three 24 is 0.86 mm, and the air gap between the meniscus negative lens three 24 and the biconvex positive lens four 25 is 0.95 mm.

[0047] In this embodiment, the material of the wide-band objective lens group A2 is multi-spectral zinc sulfide; the visible light medium-wavelength beam combiner 3 and the medium-wavelength beam combiner 13 in the spatial beam combiner group B are both parallel flat plates, and the material is single crystal germanium; in the visible light projection mirror group C: the material of the double concave negative lens 4 is H-BAK6, the materials of the glued front plate and the glued rear plate in the double-glued positive lens 5 are H-ZF6 and H-LAK50A respectively, the material of the plane reflector 6 is H-K9L, the material of the double convex positive lens 7 is H-ZK9A, the material of the glued front plate and the glued rear plate in the double-glued negative lens 8 are H-LAF3B and H-ZF72A respectively, the material of the meniscus positive lens 29 is H-LAF3B, and the material of the double-glued negative lens 210 is medium-glued The materials of the front piece and the glued back piece are H-ZF72A and H-ZK9A respectively, and the materials of the glued front piece and the glued back piece in the double-glued negative lens three 11 are H-ZK9A and H-ZF72A respectively; the materials of the double convex positive lens two 14, the meniscus positive lens three 15, the meniscus negative lens two 17 and the meniscus positive lens four 19 in the long-wave infrared projection mirror group D are single crystal germanium, the material of the meniscus negative lens one 16 is multi-spectral zinc sulfide, and the material of the double convex positive lens three 18 is chalcogenide glass; in the medium-wave infrared projection mirror group E: the materials of the meniscus positive lens five 21 and the meniscus positive lens seven 23 are single crystal silicon, the materials of the meniscus positive lens six 22 and the meniscus negative lens three 24 are single crystal germanium, and the material of the double convex positive lens four 25 is chalcogenide glass.

[0048] In this embodiment, the front surface of the wide-band objective lens group A2 is a spherical surface, and the rear surface is an aspherical surface. In the long-wave infrared projection lens group D, the front surface of the meniscus positive lens three 15 is an aspherical surface, and the rear surface is a spherical surface; the front surface of the meniscus negative lens two 17 is a spherical surface, and the rear surface is an aspherical surface; the front surface of the biconvex positive lens three 18 is a spherical surface, and the rear surface is an aspherical surface and a diffraction surface; the biconvex positive lens two 14, the meniscus negative lens one 16, and the meniscus positive lens four 19 are spherical lenses. In the medium-wave infrared projection lens group E, the front surface of the meniscus positive lens six 22 is an aspherical surface, and the rear surface is a spherical surface; the front surface of the biconvex positive lens four 25 is a spherical surface, and the rear surface is an aspherical surface; the meniscus positive lens five 21, the meniscus positive lens seven 23, and the meniscus negative lens three 24 are spherical lenses.

[0049] The aspheric equation of the aspheric lens is 1:

[0050]

[0051] In the formula: H is the sum of the squares of the horizontal and vertical coordinates, H2=X2+Y2; K is the quadratic curve constant; C is the curvature, a2, a4, a6, a8, a10, a12 are aspheric coefficients.

[0052] The equation of the diffraction surface is 2:

[0053]

[0054] In the formula: H is the sum of the squares of the horizontal and vertical coordinates, H2=X2+Y2; m is the number of diffraction rings; n0 is the refractive index of the material; C1 is the secondary phase coefficient.

[0055] In this embodiment, the front surface of the wide-band objective lens group A2 is a spherical surface with a radius of -710.54 mm; the rear surface is an aspherical surface, and the surface parameters of the aspherical surface are: C=1 / -314.6 mm, K=0, A2=0, A4=3.487036×10-9, A6=2.612347×10-13, A8=-1.145066×10-17, A10=-7.334488×10-21, A12=-1.574239×10-24.

[0056] The front surface of the meniscus positive lens 3 15 in the long-wave infrared projection lens group D is an aspherical surface, and its aspherical surface parameters are: C=1 / 40.46mm, K=0, A2=0, A4=-2.208376×10-6, A6=6.414721×10-9, A8=-1.27708×10-11, A10=8.986841×10-15, A12=-3.94615×10-18; the rear surface is a spherical surface with a radius of 464.72mm.

[0057] The front surface of the meniscus negative lens 17 in the long-wave infrared projection lens group D is spherical with a radius of -38.74 mm; the rear surface is aspherical, and the surface parameters of the aspherical surface are: C=1 / -1336.7 mm, K=0, A2=0, A4=2.786039×10-6, A6=-5.629165×10-9, A8=-1.395341×10-12, A10=1.71505×10-15, A12=1.080346×10-17.

[0058] The front surface of the biconvex positive lens 3 18 in the long-wave infrared projection lens group D is a spherical surface with a radius of 433.05 mm; the rear surface is an aspherical surface and a diffractive surface, and the surface parameters of the aspherical surface are: C=1 / -61.86 mm, K=0.61, A2=0, A4=3.844725×10-7, A6=2.489772×10-10, A8=1.124467×10-12, A10=-4.650902×10-16, A12=-3.182392×10-19, and the parameters of the diffractive surface are: C1=-1.9204085×10-4, m=-35, -34, -33..., -3, -2, -1, and n=2.778.

[0059] The front surface of the meniscus positive lens 6 22 in the medium-wave infrared projection lens group E is aspherical, and its aspherical surface parameters are: C = 1 / 71.19mm, K = 6.215, A2 = 0, A4 = -1.000482×10-7, A6 = 1.5243346×10-10, A8 = 2.008378×10-13, A10 = -6.10596×10-16, A12 = 3.39379×10-19; the rear surface is spherical, with a radius of 66.8mm.

[0060] The front surface of the biconvex positive lens 25 in the medium-wave infrared projection lens group E is spherical with a radius of 82.6 mm; the rear surface is aspherical, and the surface parameters of the aspherical surface are: C=1 / -1060mm, K-2, A2=0, A4=3.239146×10-7, A6=1.801002×10-9, A8=-2.72946×10-12, A10=--7.550532×10-15, A12=1.49497×10-17.

[0061] In this embodiment, the biconvex positive lens 2 14 in the long-wave infrared projection lens group D is a spherical lens with a front surface radius of 40.46 mm and a rear surface radius of 464.72 mm; the meniscus negative lens 16 is a spherical lens with a front surface radius of -38.74 mm and a rear surface radius of -1336 mm; the meniscus positive lens 4 19 is a spherical lens with a front surface radius of 76.93 mm and a rear surface radius of 94.6 mm; the meniscus positive lens 5 21 is a spherical lens with a front surface radius of -204.7 mm and a rear surface radius of -180.08 mm.

[0062] The positive meniscus lens 7 23 in the medium-wave infrared projection lens group E is a spherical lens with a front surface radius of -79.82 mm and a rear surface radius of -49.76 mm; the negative meniscus lens 3 24 is a spherical lens with a front surface radius of -57.17 mm and a rear surface radius of -95.15 mm.

[0063] In this embodiment, the front surface radius of the biconcave negative lens 14 in the visible light projection lens group C is -163.72 mm, and the rear surface radius is 76.9 mm; the front surface radius of the double-cemented positive lens 15 is 111.9 mm, the cemented surface radius is 62.1 mm, and the rear surface radius is -207.8 mm; the front surface radius of the biconvex positive lens 17 is 658.9 mm, and the rear surface radius is -13.97 mm; the front surface radius of the double-cemented negative lens 18 is 71.76 mm, and the cemented surface radius is 62.1 mm. The radius of the combined surface is -723.7mm, and the radius of the back surface is 47.12mm; the front surface radius of the meniscus positive lens 2 9 is 41.06mm, and the radius of the back surface is -1620mm; the front surface radius of the double-cemented negative lens 2 10 is -108.82mm, the radius of the combined surface is 32.88mm, and the radius of the back surface is -857mm; the front surface radius of the double-cemented negative lens 3 11 is 25.76mm, the radius of the combined surface is -165.93mm, and the radius of the back surface is 26.42mm.

[0064] In this embodiment, the visible light medium-wavelength beam combiner 3 and the medium-wavelength beam combiner 13 in the spatial beam combiner group B both form an angle of 45° with the optical axis; the plane reflector 6 in the visible light projection mirror group C forms an angle of 45° with the optical axis.

[0065] In this embodiment, the working band of the long exit pupil distance wide band common aperture composite simulation optical system is 0.55μm~0.75μm, 3μm~5μm, 8μm~12μm, the field of view is 8°×6°, the resolution is 1280×1024, the exit pupil diameter is 35mm@0.55μm~0.75μm, 45mm@3μm~5μm, 70mm@8μm~12μm, and the exit pupil distance is 500mm; the field of view is 8°×6°, which is a composite simulation optical system with the characteristics of long exit pupil distance, wide working band and wide field of view.

[0066] In this embodiment, the overlap of the scenes simulated by the long exit pupil distance wide band common aperture composite simulation optical system in the visible light band, the medium wave infrared band and the long wave infrared band is 0.006°.

[0067] In this embodiment, the long exit pupil distance wide band common aperture composite analog optical system can convert the digital image signal into a multi-spectral scene optical signal, and realize the common aperture composite analog output of the optical signal, including scene image information of visible light characteristics, medium-wave infrared radiation characteristics, and long-wave infrared radiation characteristics.

[0068] In this embodiment, the long exit pupil distance wide band common aperture composite simulation optical system adopts a common aperture wide band optical path design structure to achieve high-precision coincidence characteristic simulation of multi-spectral scene images, with a coincidence accuracy of 0.006°.

[0069] In this embodiment, the long exit pupil distance wide band common aperture composite simulation optical system is designed as a three-way image conversion source in terms of visible light characteristics, medium wave infrared radiation characteristics, and long wave infrared radiation characteristics, which can realize simultaneous operation of a wide band or work independently.

[0070] In this embodiment, the long exit pupil distance wide band common aperture composite simulation optical system can work in pairs to form a common aperture high-precision composite simulation of visible light / medium wave scenes, a common aperture high-precision composite simulation of visible light / long wave scenes, or a common aperture high-precision composite simulation of medium wave / long wave scenes.

[0071] In this embodiment, the long exit pupil distance, wide band common aperture composite simulation optical system is designed with a long exit pupil distance, thereby ensuring that the composite simulation simulator or projection device using this optical system can adapt to the working requirements of the five-axis turntable, thereby realizing the miniaturized design of the long exit pupil distance, wide band common aperture composite simulation optical system.

[0072] In this embodiment, the long exit pupil distance wide band common aperture composite simulation optical system adopts a wide band objective lens group made of multi-spectral zinc sulfide and combines with a spatial beam combining design to achieve a miniaturized design of a multi-band, long exit pupil distance, common aperture composite simulation optical system.

[0073] In this embodiment, the long-exit-pupil-distance wide-band common-aperture composite simulation optical system can be applied to simulation tests of existing and pre-research imaging guidance equipment. For example, it can be applied to composite imaging guidance equipment, such as visible light / long-wave infrared imaging guidance equipment, infrared two-color imaging guidance equipment, single-mode imaging guidance equipment, such as simulation tests of visible light imaging guidance equipment, medium-wave infrared imaging guidance equipment, and long-wave infrared imaging guidance equipment. It can also be applied to technical testing and verification of visible light / medium-wave infrared imaging guidance equipment, visible light / medium-wave infrared / long-wave infrared imaging guidance equipment and related directions. The optical system has certain versatility and applicability, and can greatly improve the working efficiency of simulation equipment.

[0074] In a specific embodiment, in the visible light band of 0.55μm to 0.75μm, the modulation transfer function curve MTF in the full field of view is ≥0.64@58lp / mm, the distortion is ≤0.6%, and the relative illumination is ≥0.98; in the mid-wave infrared band of 3μm to 5μm, the modulation transfer function curve MTF in the full field of view is ≥0.34@37lp / mm, the distortion is ≤0.05%, and the relative illumination is ≥0.98; in the long-wave infrared band of 8μm to 12μm, the modulation transfer function curve MTF in the full field of view is ≥0.3@28lp / mm, the distortion is ≤0.6%, and the relative illumination is ≥0.97. The system has good imaging quality in each band and meets the requirements of multi-spectral scene simulation.

[0075] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite analog optical system with a long exit pupil distance and a wide band and a common aperture, characterized in that: The optical system is provided with a wide-band objective lens group A, a spatial beam combining lens group B and a long-wave infrared projection lens group D in sequence from left to right along the light beam; the visible light projection lens group C is located on the upper side of the spatial beam combining lens group B, and the visible light image plane is located on the right side of the visible light projection lens group C; the medium-wave infrared projection lens group E is located on the lower side of the spatial beam combining lens group B, the medium-wave infrared image plane (26) is located on the lower side of the medium-wave infrared projection lens group E, the long-wave infrared image plane (20) is located on the right side of the medium-wave infrared image plane (26), and the exit pupil position (1) is located on the left side of the wide-band objective lens group A; Image converter 1 is located on the visible light image plane (12), and the visible light image generated by it is incident on the spatial beam combining mirror group B through the visible light projection mirror group C, and is reflected; image converter 2 is located on the long-wave infrared image plane (20), and the long-wave infrared radiation image generated by it is incident on the spatial beam combining mirror group B through the long-wave infrared projection mirror group D, and is transmitted; The image converter 3 is located on the medium-wave infrared image plane (26), and the medium-wave infrared radiation image generated by the image converter is incident on the space beam combining mirror group B through the medium-wave infrared projection mirror group E and reflected; the visible light image, the long-wave infrared radiation image, and the medium-wave infrared radiation image are combined by the space beam combining mirror group B at a common aperture, and then collimated into parallel light by the wide-band objective lens group A and output to the exit pupil position (1) of the long-exit-pupil-distance wide-band common-aperture composite simulation optical system, simulating target and scene images with visible light imaging characteristics and long-wave and medium-wave infrared thermal radiation characteristics; The wide-band objective lens group A comprises a meniscus positive lens (2); the spatial beam combining lens group B comprises a visible light medium-wavelength beam combining lens (3) and a medium-wavelength beam combining lens (13); the visible light projection lens group C comprises a double concave negative lens (4), a double-cemented positive lens (5), a plane reflecting mirror (6), a double-convex positive lens (7), a double-cemented negative lens (8), a second meniscus positive lens (9), a second double-cemented negative lens (10), and a third double-cemented negative lens (11); The long-wave infrared projection lens group D comprises a second biconvex positive lens (14), a third meniscus positive lens (15), a first meniscus negative lens (16), a second meniscus negative lens (17), a third biconvex positive lens (18), and a fourth meniscus positive lens (19); the medium-wave infrared projection lens group E comprises a fifth meniscus positive lens (21), a sixth meniscus positive lens (22), a seventh meniscus positive lens (23), a third meniscus negative lens (24), and a fourth biconvex positive lens (25); The visible light medium wave beam combiner (3), medium wavelength beam combiner (13), and plane reflector (6) are all arranged at an inclination of 45 degrees; the air gap between the wide-band objective lens group A and the visible light medium wave beam combiner (3) in the space beam combiner group B is 539 mm; the air gap between the visible light medium wave beam combiner (3) and the medium wavelength beam combiner (13) in the space beam combiner group B is 98.5 mm; the air gap between the visible light medium wave beam combiner (3) in the space beam combiner group B and the double concave negative lens 1 (4) in the visible light projection lens group C is 165.5 mm; the air gap between the medium wavelength beam combiner (13) in the space beam combiner group B and the double convex positive lens 2 (14) in the long-wave infrared projection lens group D is 51 mm; the air gap between the medium wavelength beam combiner (13) in the space beam combiner group B and the meniscus positive lens 5 (21) in the medium-wave infrared projection lens group E is 58 mm; In the visible light projection lens group C, the air gap between the biconcave negative lens 1 (4) and the double-cemented positive lens 1 (5) is 7.7 mm, the air gap between the double-cemented positive lens 1 (5) and the plane reflector (6) is 92 mm, the air gap between the plane reflector (6) and the biconvex positive lens 1 (7) is 200 mm, the air gap between the biconvex positive lens 1 (7) and the double-cemented negative lens 1 (8) is 1.23 mm, the air gap between the double-cemented negative lens 1 (8) and the meniscus positive lens 2 (9) is 1 mm, the air gap between the meniscus positive lens 2 (9) and the double-cemented negative lens 2 (10) is 6.72 mm, and the air gap between the double-cemented negative lens 2 (10) and the double-cemented negative lens 3 (11) is 1 mm. In the long-wave infrared projection lens group D, the air gap between the biconvex positive lens 2 (14) and the meniscus positive lens 3 (15) is 100.5 mm, the air gap between the meniscus positive lens 3 (15) and the meniscus negative lens 1 (16) is 0.95 mm, the air gap between the meniscus negative lens 1 (16) and the meniscus negative lens 2 (17) is 17.6 mm, the air gap between the meniscus negative lens 2 (17) and the biconvex positive lens 3 (18) is 3.25 mm, and the air gap between the biconvex positive lens 3 (18) and the meniscus positive lens 4 (19) is 95.1 mm. In the medium-wave infrared projection lens group E: the air gap between the meniscus positive lens five (21) and the meniscus positive lens six (22) is 97.35 mm, the air gap between the meniscus positive lens six (22) and the meniscus positive lens seven (23) is 98.48 mm, the air gap between the meniscus positive lens seven (23) and the meniscus negative lens three (24) is 0.86 mm, and the air gap between the meniscus negative lens three (24) and the biconvex positive lens four (25) is 0.95 mm.

2. The long exit pupil distance, wide band, common aperture composite simulation optical system according to claim 1, characterized in that: The front surface of the wide-band objective lens group A is spherical, and the rear surface is aspherical; the front surface of the meniscus positive lens 3 (15) in the long-wave infrared projection lens group D is aspherical, and the rear surface is spherical; the front surface of the meniscus negative lens 2 (17) is spherical, and the rear surface is aspherical; the front surface of the biconvex positive lens 3 (18) is spherical, and the rear surface is aspherical and diffractive; the biconvex positive lens 2 (14), the meniscus negative lens 1 (16), and the meniscus positive lens 4 (19) are spherical lenses; the front surface of the meniscus positive lens 6 (22) in the medium-wave infrared projection lens group E is aspherical, and the rear surface is spherical; the front surface of the biconvex positive lens 4 (25) is spherical, and the rear surface is aspherical; the meniscus positive lens 5 (21), the meniscus positive lens 7 (23), and the meniscus negative lens 3 (24) are spherical lenses.

3. The long exit pupil distance, wide band, common aperture composite simulation optical system according to claim 1, characterized in that: The visible light medium-wavelength beam combining mirror (3) and the medium-wavelength beam combining mirror (13) in the spatial beam combining mirror group B both form an angle of 45° with the optical axis; and the plane reflector (6) in the visible light projection mirror group C forms an angle of 45° with the optical axis.

4. The long exit pupil distance, wide band, common aperture composite simulation optical system according to claim 1, characterized in that: The working band of the long exit pupil distance wide band common aperture composite simulation optical system is 0.55μm~0.75μm, 3μm~5μm, 8μm~12μm, the field of view is 8°×6°, the resolution is 1280×1024, the exit pupil diameter is 35mm@0.55μm~0.75μm, 45mm@3μm ~5μm, 70mm@8μm~12μm, the exit pupil distance is 500mm, and the overlap of visible light, medium-wave infrared and long-wave infrared simulation scenes is 0.006°.

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