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

Abstract

The invention 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] This invention belongs to the field of target scene composite simulation technology, and more specifically, it is a long-exit pupil distance wide-band common aperture composite simulation optical system. Background Technology

[0002] Typically, scene simulation optical systems operating in a single wavelength range include visible light simulation optical systems, mid-wave infrared simulation optical systems, and long-wave infrared simulation optical systems. That is, the operating wavelength of the designed optical simulation optical system varies depending on the operating wavelength. To meet the development requirements of multi-mode operation in optical imaging and guidance equipment, the demand for wide-band common-aperture composite simulation optical systems used in hardware-in-the-loop simulation and testing is increasing.

[0003] To meet the application requirements of hardware-in-the-loop simulation (HILS) testing, integrating multi-channel simulation scenarios with different operating wavelengths and using a common aperture design is one of the key directions for composite simulation applications. Wideband common-aperture composite simulation systems can be applied to the simulation testing of existing composite imaging guidance equipment (such as visible / long-wave infrared imaging guidance equipment, infrared dual-color imaging guidance equipment), single-mode imaging guidance equipment (such as visible light imaging guidance equipment, mid-wave infrared imaging guidance equipment, and long-wave infrared imaging guidance equipment), and can also be used for technical testing and verification of visible / mid-wave infrared imaging guidance equipment, visible / mid-wave infrared / long-wave infrared imaging guidance equipment, and related fields.

[0004] Single-channel target simulator systems are only suitable for simulation of imaging guidance equipment in specific bands, and are not applicable to hardware-in-the-loop simulation tests of three-mode composite imaging guidance equipment or two-mode composite imaging guidance equipment.

[0005] To address these issues, a wide-band, common-aperture composite analog optical system with a long external pupil distance is provided. Summary of the Invention

[0006] This invention provides a long exit pupil distance, wide-band common aperture composite simulation optical system, which can solve the problem that single-channel target simulator systems are only suitable for imaging guidance equipment simulation in specific bands and are not applicable to hardware-in-the-loop simulation tests of three-mode composite imaging guidance equipment and two-mode composite imaging guidance equipment.

[0007] A wide-band, common-aperture composite analog optical system with a long exit pupil distance is provided. The optical system comprises, from left to right along the light ray, a wide-band objective lens group A, a spatial beam combiner group B, and a long-wave infrared projection lens group D. A visible light projection lens group C is located above the spatial beam combiner group B, with the visible light image plane located to the right of the visible light projection lens group C. A mid-wave infrared projection lens group E is located below the spatial beam combiner group B, with the mid-wave infrared image plane located below the mid-wave infrared projection lens group E, and the long-wave infrared image plane located to the right of the mid-wave infrared image plane. The exit pupil position is located to the left of the wide-band objective lens group A.

[0008] Image converter one is located on the visible light image plane. The visible light image it generates is incident on the spatial beam combiner group B through the visible light projection lens group C and reflected. Image converter two is located on the long-wave infrared image plane. The long-wave infrared radiation image it generates is incident on the spatial beam combiner group B through the long-wave infrared projection lens group D and transmitted. Image converter three is located on the mid-wave infrared image plane. The mid-wave infrared radiation image it generates is incident on the spatial beam combiner group B through the mid-wave infrared projection lens group E and reflected. The visible light image, long-wave infrared radiation image, and mid-wave infrared radiation image are combined by the spatial beam combiner group B with a common aperture. The beam is then 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 to simulate target and scene images with visible light imaging characteristics and long-wave and mid-wave infrared thermal radiation characteristics.

[0009] The broadband objective lens group A includes a meniscus positive lens one; the spatial beam combiner group B includes a visible light mid-wave beam combiner and a mid-wavelength beam combiner; the visible light projection lens group C includes a biconcave negative lens one, a cemented doublet positive lens one, a plane mirror, a biconvex positive lens one, a cemented doublet negative lens one, a meniscus positive lens two, a cemented doublet negative lens two, and a cemented doublet negative lens three; the long-wave infrared projection lens group D includes a biconvex positive lens two, a meniscus positive lens three, a meniscus negative lens one, a meniscus negative lens two, a biconvex positive lens three, and a meniscus positive lens four; the mid-wave infrared projection lens group E includes a meniscus positive lens five, a meniscus positive lens six, a meniscus positive lens seven, a meniscus negative lens three, and a biconvex positive lens four.

[0010] The visible light mid-wave beam combiner, mid-wavelength beam combiner, and plane mirror are all tilted at 45°. The air gap between the visible light mid-wave beam combiner in the wide-band objective lens group A and the visible light mid-wave beam combiner in the space beam combiner group B is 539 mm; the air gap between the visible light mid-wave beam combiner and the mid-wavelength beam combiner in the space beam combiner group B is 98.5 mm; the air gap between the visible light mid-wave beam combiner in the space beam combiner group B and the first biconcave negative lens in the visible light projection lens group C is 165.5 mm; the air gap between the mid-wavelength beam combiner in the space beam combiner group B and the second biconvex positive lens in the long-wave infrared projection lens group D is 51 mm; and the air gap between the mid-wavelength beam combiner in the space beam combiner group B and the fifth meniscus positive lens in the mid-wave infrared projection lens group E is 58 mm.

[0011] In the visible light projection lens group C: the air gap between the first biconcave negative lens and the first cemented doublet positive lens is 7.7 mm, the air gap between the first cemented doublet positive lens and the plane mirror is 92 mm, the air gap between the plane mirror and the first biconvex positive lens is 200 mm, the air gap between the first biconvex positive lens and the first cemented doublet negative lens is 1.23 mm, the air gap between the first cemented doublet negative lens and the second meniscus positive lens is 1 mm, the air gap between the second meniscus positive lens and the second cemented doublet negative lens is 6.72 mm, and the air gap between the second cemented doublet negative lens and the third cemented doublet negative lens is 1 mm.

[0012] In the long-wave infrared projection lens group D: the air gap between the second biconvex positive lens and the third meniscus positive lens is 100.5 mm, the air gap between the third meniscus positive lens and the first meniscus negative lens is 0.95 mm, the air gap between the first meniscus negative lens and the second meniscus negative lens is 17.6 mm, the air gap between the second meniscus negative lens and the third biconvex positive lens is 3.25 mm, and the air gap between the third biconvex positive lens and the fourth meniscus positive lens is 95.1 mm.

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

[0014] Furthermore, in the wideband objective lens group A, the front surface is spherical and the rear surface is aspherical; in the long-wave infrared projection lens group D, the front surface of the third meniscus positive lens is aspherical and the rear surface is spherical; the front surface of the second meniscus negative lens is spherical and the rear surface is aspherical; the front surface of the third biconvex positive lens is spherical and the rear surface is aspherical and diffraction surface; the second biconvex positive lens, the first meniscus negative lens, and the fourth meniscus positive lens are spherical lenses; in the mid-wave infrared projection lens group E, the front surface of the sixth meniscus positive lens is aspherical and the rear surface is spherical; the front surface of the fourth biconvex positive lens is spherical and the rear surface is aspherical; the fifth meniscus positive lens, the seventh meniscus positive lens, and the third meniscus negative lens are spherical lenses.

[0015] Furthermore, the visible light mid-wave beam combiner and the mid-wavelength beam combiner in the spatial beam combiner group B are both at a 45° angle to the optical axis; the plane mirror in the visible light projection mirror group C is at a 45° angle to the optical axis.

[0016] Furthermore, the operating wavelengths of the long exit pupil distance wide-band common aperture composite analog optical system are 0.55μm~0.75μm, 3μm~5μm, and 8μm~12μm, with a field of view of 8°×6°, a resolution of 1280×1024, an exit pupil diameter of 35mm@0.55μm~0.75μm, 45mm@3μm~5μm, and 70mm@8μm~12μm, an exit pupil distance of 500mm, and an overlap of 0.006° between the visible light, mid-wave infrared, and long-wave infrared simulated scenes.

[0017] Beneficial effects:

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

[0019] 2. A common-aperture, wide-band optical path design structure is adopted to achieve high-precision simulation of the overlap characteristics of multispectral scene images, with an overlap accuracy of 0.006°;

[0020] 3. The example operates in the following wavelength ranges: 0.55μm~0.75μm, 3μm~5μm, and 8μm~12μm. The exit pupil distance is 500mm, and the exit pupil diameter is 35mm@0.55μm~0.75μm, 45mm@3μm~5μm, and 70mm@8μm~12μm. The field of view is 8°×6°. It is a composite analog optical system with long exit pupil distance, wide operating wavelength range, and wide field of view.

[0021] 4. The visible light characteristics, mid-wave infrared radiation characteristics, and long-wave infrared radiation characteristics are designed as three-way image conversion sources, which can achieve simultaneous operation in a wide band or operate independently.

[0022] 5. It can work in pairs to form a common aperture high-precision composite simulation of visible light / mid-wave scene, a common aperture high-precision composite simulation of visible light / long-wave scene, or a common aperture high-precision composite simulation of mid-wave / long-wave scene.

[0023] 6. The example uses a wide-band objective lens group made of multispectral 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 analog optical system.

[0024] 7. By designing a long exit pupil distance, the composite simulation simulator or projection device using this optical system is guaranteed to meet the working requirements of a five-axis turntable, thus realizing the miniaturized design of a long exit pupil distance wide-band common aperture composite simulation optical system.

[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, mid-wave infrared imaging guidance equipment, long-wave infrared imaging guidance equipment), and also to technical testing and verification of visible light / mid-wave infrared imaging guidance equipment, visible light / mid-wave infrared / long-wave infrared imaging guidance equipment, and related fields. This optical system has a certain degree of versatility and applicability, and can significantly improve the working efficiency of simulation equipment. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a long exit pupil distance, wide-band common aperture composite analog optical system according to an embodiment;

[0027] Figure 2 The following is a graph showing the modulation transfer function in the visible light band for an example.

[0028] Figure 3 This is a dot plot of an example in the visible light band;

[0029] Figure 4 The field region and distortion curves in the visible light band are shown in the example diagram;

[0030] Figure 5 The relative illuminance curves in the visible light band are for an example.

[0031] Figure 6 This is a modulation transfer function curve in the mid-wave infrared band of an example.

[0032] Figure 7 This is a dot plot of an example in the mid-infrared band;

[0033] Figure 8 The field area and distortion curves in the mid-infrared band are shown in the example diagram;

[0034] Figure 9 The relative illuminance curve for the example in the mid-infrared band is shown below.

[0035] Figure 10 The following is a modulation transfer function curve in the long-wave infrared band, as an example.

[0036] Figure 11 This is a dot plot in the long-wave infrared band of an example.

[0037] Figure 12 The field area and distortion curves in the long-wave infrared band are shown in the example diagram;

[0038] Figure 13 The diagram shows the relative illuminance curve in the long-wave infrared band for an example.

[0039] In the diagram: 1-Exit pupil; 2-Mendelian positive lens 1; 3-Visible mid-wave beam combiner; 4-Biconcave negative lens 1; 5-Cemented doublet positive lens 1; 6-Planet mirror; 7-Biconvex positive lens 1; 8-Cemented doublet negative lens 1; 9-Mendelian positive lens 2; 10-Cemented doublet negative lens 2; 11-Cemented doublet negative lens 3; 12-Visible image plane; 13-Mid-wave beam combiner; 14-Biconvex positive lens 2; 15-Mendelian positive lens 3; 16-Mendelian negative lens 1; 17-Mendelian negative lens 2; 18-Biconvex positive lens 3; 19-Mendelian positive lens 4; 20-Long-wave infrared image plane; 21-Mendelian positive lens 5; 22-Mendelian positive lens 6; 23-Mendelian positive lens 7; 24-Mendelian negative lens 3; 25-Biconvex positive lens 4; 26-Mid-wave infrared image plane. Detailed Implementation

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

[0041] Image converter one is located on the visible light image plane 12. The visible light image it generates is incident on the spatial beam combiner group B via the visible light projection lens group C and is reflected. Image converter two is located on the long-wave infrared image plane 20. The long-wave infrared radiation image it generates is incident on the spatial beam combiner group B via the long-wave infrared projection lens group D and is transmitted. Image converter three is located on the mid-wave infrared image plane 26. The mid-wave infrared radiation image it generates is incident on the spatial beam combiner group B via the mid-wave infrared projection lens group E and is reflected. The visible light image, long-wave infrared radiation image, and mid-wave infrared radiation image are combined by the spatial beam combiner group B with a common aperture. The combined light is 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 mid-wave infrared thermal radiation characteristics.

[0042] The wideband objective lens group A includes a meniscus positive lens 2; the spatial beam combiner group B includes a visible mid-wave beam combiner 3 and a mid-wavelength beam combiner 13; the visible light projection lens group C includes a biconcave negative lens 4, a cemented doublet positive lens 5, a plane mirror 6, a biconvex positive lens 7, a cemented doublet negative lens 8, a meniscus positive lens 9, a cemented doublet negative lens 10, and a cemented doublet negative lens 3 11; the long-wave infrared projection lens group D includes a biconvex positive lens 2 14, a meniscus positive lens 3 15, a meniscus negative lens 16, a meniscus negative lens 2 17, a biconvex positive lens 3 18, and a meniscus positive lens 4 19; the mid-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 biconvex positive lens 4 25.

[0043] In this embodiment, the visible light mid-wave beam combiner 3, the mid-wavelength beam combiner 13, and the plane mirror 6 are all tilted at 45°; the air gap between the wideband objective lens group A2 and the visible light mid-wavelength beam combiner 3 in the spatial beam combiner group B is 539 mm; the air gap between the visible light mid-wavelength beam combiner 3 and the mid-wavelength beam combiner 13 in the spatial beam combiner group B is 98.5 mm; the air gap between the visible light mid-wavelength beam combiner 3 and the biconcave negative lens 4 in the visible light projection lens group C is 165.5 mm; the air gap between the mid-wavelength beam combiner 13 and the biconvex positive lens 14 in the long-wave infrared projection lens group D is 51 mm; and the air gap between the mid-wavelength beam combiner 13 and the meniscus positive lens 21 in the mid-wave infrared projection lens group E is 58 mm.

[0044] In this embodiment, in the visible light projection lens group C: the air gap between the biconcave negative lens 4 and the cemented doublet positive lens 5 is 7.7 mm; the air gap between the cemented doublet positive lens 5 and the plane mirror 6 is 92 mm; the air gap between the plane mirror 6 and the biconvex positive lens 7 is 200 mm; the air gap between the biconvex positive lens 7 and the cemented doublet negative lens 8 is 1.23 mm; the air gap between the cemented doublet negative lens 8 and the meniscus positive lens 9 is 1 mm; the air gap between the meniscus positive lens 9 and the cemented doublet negative lens 10 is 6.72 mm; and the air gap between the cemented doublet negative lens 10 and the cemented doublet negative lens 11 is 1 mm.

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

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

[0047] In this embodiment, the material of the wideband objective lens group A2 is multispectral zinc sulfide; the visible light mid-wave beam combiner 3 and mid-wavelength beam combiner 13 in the space beam combiner group B are both parallel plates made of single-crystal germanium; in the visible light projection lens group C: the material of the biconcave negative lens 4 is H-BAK6, the materials of the cemented front and rear plates of the cemented positive lens 5 are H-ZF6 and H-LAK50A respectively, the material of the plane mirror 6 is H-K9L, the material of the biconvex positive lens 7 is H-ZK9A, the materials of the cemented front and rear plates of the cemented negative lens 8 are H-LAF3B and H-ZF72A respectively, the material of the meniscus positive lens 9 is H-LAF3B, and the material of the cemented negative lens 10 is medium cemented... The front and cemented back lenses are made of H-ZF72A and H-ZK9A, respectively. In the cemented negative lens 311, the front and back lenses are made of H-ZK9A and H-ZF72A, respectively. In the long-wave infrared projection lens group D, the biconvex positive lens 214, meniscus positive lens 315, meniscus negative lens 217, and meniscus positive lens 419 are made of single-crystal germanium; the meniscus negative lens 16 is made of multispectral zinc sulfide; and the biconvex positive lens 318 is made of chalcogenide glass. In the mid-wave infrared projection lens group E, the meniscus positive lens 521 and meniscus positive lens 723 are made of single-crystal silicon; the meniscus positive lens 622 and meniscus negative lens 324 are made of single-crystal germanium; and the biconvex positive lens 425 is made of chalcogenide glass.

[0048] In this embodiment, the front surface of the wideband objective lens group A2 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 3 15 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. In the mid-wave infrared projection lens group E, the front surface of the meniscus positive lens 6 22 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 front surface of the meniscus positive lens 5 21, the meniscus positive lens 7 23, and the meniscus negative lens 3 24 are spherical lenses.

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

[0050] (1)

[0052] In the formula: H is the sum of squares of the horizontal and vertical coordinates, H2 = X2 + Y2; K is the constant of the quadratic curve; C is the curvature; and a2, a4, a6, a8, a10, and a12 are aspherical coefficients.

[0053] The equation for the diffraction surface is 2:

[0054] (2)

[0056] In the formula: H is the sum of squares of the horizontal and vertical coordinates, H2 = X2 + Y2; m is the diffraction zone number; n0 is the refractive index of the material; C1 is the second phase coefficient.

[0057] In this embodiment, the front surface of the wideband objective lens group A2 is spherical with a radius of -710.54 mm; the rear surface is aspherical with the following surface parameters: 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.

[0058] The front surface of the meniscus positive lens 315 in the long-wave infrared projection lens group D is aspherical, and its aspherical surface parameters are: C = 1 / 40.46 mm, 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 spherical with a radius of 464.72 mm.

[0059] 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 with the following surface parameters: 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.

[0060] The front surface of the biconvex positive lens 18 in the long-wave infrared projection lens group D is spherical with a radius of 433.05 mm; the rear surface is aspherical and diffractive. The surface shape 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. The parameters of the diffractive surface are: C1 = -1.9204085 × 10-4, m = -35, -34, -33..., -3, -2, -1, n = 2.778.

[0061] The front surface of the meniscus positive lens 622 in the mid-wave infrared projection lens group E is aspherical, and its aspherical surface parameters are: C = 1 / 71.19 mm, 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 66.8 mm.

[0062] The biconvex positive lens 425 in the mid-wave infrared projection lens group E has a spherical front surface with a radius of 82.6 mm; the rear surface is aspherical with the following surface parameters: C = 1 / -1060 mm, 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.

[0063] In this embodiment, the biconvex positive lens 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 19 is a spherical lens with a front surface radius of 76.93 mm and a rear surface radius of 94.6 mm; and the meniscus positive lens 21 is a spherical lens with a front surface radius of -204.7 mm and a rear surface radius of -180.08 mm.

[0064] The meniscus positive lens 7 23 in the mid-wave infrared projection lens group E is a spherical lens with a front surface radius of -79.82mm and a rear surface radius of -49.76mm; the meniscus negative lens 3 24 is a spherical lens with a front surface radius of -57.17mm and a rear surface radius of -95.15mm.

[0065] In this embodiment, the biconcave negative lens 4 in the visible light projection lens group C has a front surface radius of -163.72 mm and a rear surface radius of 76.9 mm; the cemented doublet positive lens 5 has a front surface radius of 111.9 mm, a cemented surface radius of 62.1 mm, and a rear surface radius of -207.8 mm; the biconvex positive lens 7 has a front surface radius of 658.9 mm and a rear surface radius of -13.97 mm; and the cemented doublet negative lens 8 has a front surface radius of 71.76 mm and a cemented surface radius of -163.72 mm. The front surface radius of the cemented lens is -723.7mm, and the rear surface radius is 47.12mm; the front surface radius of the meniscus positive lens II 9 is 41.06mm, and the rear surface radius is -1620mm; the front surface radius of the cemented negative lens II 10 is -108.82mm, the cemented surface radius is 32.88mm, and the rear surface radius is -857mm; the front surface radius of the cemented negative lens III 11 is 25.76mm, the cemented surface radius is -165.93mm, and the rear surface radius is 26.42mm.

[0066] In this embodiment, the visible light mid-wave beam combiner 3 and the mid-wavelength beam combiner 13 in the spatial beam combiner group B are both at a 45° angle to the optical axis; the plane mirror 6 in the visible light projection mirror group C is at a 45° angle to the optical axis.

[0067] In this embodiment, the operating wavelengths of the long exit pupil distance, wide band, and common aperture composite analog optical system are 0.55μm~0.75μm, 3μm~5μm, and 8μm~12μm, with a field of view of 8°×6°, a resolution of 1280×1024, an exit pupil diameter of 35mm@0.55μm~0.75μm, 45mm@3μm~5μm, and 70mm@8μm~12μm, and an exit pupil distance of 500mm. The field of view is 8°×6°, making it a composite analog optical system with long exit pupil distance, wide operating wavelength, and wide field of view.

[0068] In this embodiment, the overlap of the simulated scenes in the visible light band, mid-wave infrared band, and long-wave infrared band by the long exit pupil distance wide-band common aperture composite simulation optical system is 0.006°.

[0069] In this embodiment, the long exit pupil distance wide-band common aperture composite analog optical system can convert digital image signals into multispectral scene optical signals and realize the common aperture composite analog output of the optical signals, including scene image information with visible light characteristics, mid-wave infrared radiation characteristics, and long-wave infrared radiation characteristics.

[0070] 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 simulation of the overlap characteristics of multispectral scene images, with an overlap accuracy of 0.006°.

[0071] In this embodiment, the wide-band common-aperture composite analog optical system with long exit pupil distance is designed as a three-way image conversion source with visible light characteristics, mid-wave infrared radiation characteristics, and long-wave infrared radiation characteristics, which can achieve simultaneous operation in a wide band or operate independently.

[0072] In this embodiment, the wide-band common-aperture composite simulation optical system with long exit pupil distance can work in pairs to form a common-aperture high-precision composite simulation of visible light / mid-wave scenes, a common-aperture high-precision composite simulation of visible light / long-wave scenes, or a common-aperture high-precision composite simulation of mid-wave / long-wave scenes.

[0073] In this embodiment, the long exit pupil distance wide-band common aperture composite simulation optical system, through the design of the long exit pupil distance, ensures 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 miniaturization design of the long exit pupil distance wide-band common aperture composite simulation optical system.

[0074] In this embodiment, the wide-band common-aperture composite analog optical system with long exit pupil distance adopts a wide-band objective lens group made of multispectral zinc sulfide and combined with a spatial beam-combining design to achieve a miniaturized design of a multi-band, long exit pupil distance, common-aperture composite analog optical system.

[0075] 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 the simulation tests of composite imaging guidance equipment, such as visible light / long-wave infrared imaging guidance equipment, infrared dual-color imaging guidance equipment, and single-mode imaging guidance equipment, such as visible light imaging guidance equipment, mid-wave infrared imaging guidance equipment, and long-wave infrared imaging guidance equipment. It can also be applied to the technical testing and verification of visible light / mid-wave infrared imaging guidance equipment, visible light / mid-wave infrared / long-wave infrared imaging guidance equipment, and related fields. This optical system has a certain degree of versatility and applicability, and can significantly improve the working efficiency of simulation equipment.

[0076] In one specific embodiment, in the visible light band (0.55μm–0.75μm), the modulation transfer function (MTF) curve across the entire field of view is ≥0.64@58lp / mm, distortion ≤0.6%, and relative illumination ≥0.98; in the mid-infrared band (3μm–5μm), the MTF curve across the entire field of view is ≥0.34@37lp / mm, distortion ≤0.05%, and relative illumination ≥0.98; in the long-wave infrared band (8μm–12μm), the MTF curve across the entire field of view is ≥0.3@28lp / mm, distortion ≤0.6%, and relative illumination ≥0.97. The system exhibits good imaging quality across all bands, meeting the requirements for multispectral scene simulation.

[0077] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wide-band, common-aperture composite analog optical system with long exit pupil distance, characterized in that, The optical system consists of a wideband objective lens group A (2), a spatial beam combiner group B (3, 13), and a long-wave infrared projection lens group D (14-19) arranged sequentially from left to right along the light rays. The visible light projection lens group C (4-11) is located above the spatial beam combiner group B (3, 13), and the visible light image plane (12) is located to the right of the visible light projection lens group C (4-11). The mid-wave infrared projection lens group E (21-25) is located below the spatial beam combiner group B (3, 13), the mid-wave infrared image plane (26) is located below the mid-wave infrared projection lens group E (21-25), the long-wave infrared image plane (20) is located to the right of the mid-wave infrared image plane (26), and the exit pupil position (1) is located to the left of the wideband objective lens group A (2). Image converter one is located on the visible light image plane (12). The visible light image generated by it is incident on the spatial beam combiner group B through the visible light projection lens group C and reflected. Image converter two is located on the long-wave infrared image plane (20). The long-wave infrared radiation image generated by it is incident on the spatial beam combiner group B through the long-wave infrared projection lens group D and transmitted. Image converter 3 is located on the mid-wave infrared image plane (26). The mid-wave infrared radiation image generated by it is incident on the space beam combiner group B through the mid-wave infrared projection lens group E and reflected. The visible light image, long-wave infrared radiation image and mid-wave infrared radiation image are combined by the space beam combiner group B with a common aperture. The beam is 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 to simulate the target and scene image with visible light imaging characteristics and long-wave and mid-wave infrared thermal radiation characteristics. The wideband objective lens group A includes a meniscus positive lens one (2); the spatial beam combiner group B (3, 13) includes a visible light mid-wave beam combiner (3) and a mid-wavelength beam combiner (13); the visible light projection lens group C includes a biconcave negative lens one (4), a cemented doublet positive lens one (5), a plane mirror (6), a biconvex positive lens one (7), a cemented doublet negative lens one (8), a meniscus positive lens two (9), a cemented doublet negative lens two (10), and a cemented doublet negative lens three (11). 1); The long-wave infrared projection lens group D includes a biconvex positive lens 2 (14), a meniscus positive lens 3 (15), a meniscus negative lens 1 (16), a meniscus negative lens 2 (17), a biconvex positive lens 3 (18), and a meniscus positive lens 4 (19); The mid-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 biconvex positive lens 4 (25); The visible light mid-wave beam combiner (3), mid-wavelength beam combiner (13), and plane mirror (6) are all tilted at 45°; the air gap between the wide-band objective lens group A (2) and the visible light mid-wavelength beam combiner (3) in the space beam combiner group B is 539 mm; the air gap between the visible light mid-wavelength beam combiner (3) and the mid-wavelength beam combiner (13) in the space beam combiner group B is 98.5 mm; the visible light mid-wavelength beam combiner (6) in the space beam combiner group B... The air gap between the beam combiner (3) and the first biconcave negative lens (4) in the visible light projection lens group C is 165.5 mm; the air gap between the mid-wavelength beam combiner (13) in the spatial beam combiner group B and the second biconvex positive lens (14) in the long-wave infrared projection lens group D is 51 mm; the air gap between the mid-wavelength beam combiner (13) in the spatial beam combiner group B and the fifth meniscus positive lens (21) in the mid-wave infrared projection lens group E is 58 mm. In the visible light projection lens group C: the air gap between the first biconcave negative lens (4) and the first cemented doublet positive lens (5) is 7.7 mm, the air gap between the first cemented doublet positive lens (5) and the plane mirror (6) is 92 mm, the air gap between the plane mirror (6) and the first biconvex positive lens (7) is 200 mm, the air gap between the first biconvex positive lens (7) and the first cemented doublet negative lens (8) is 1.23 mm, the air gap between the first cemented doublet negative lens (8) and the second meniscus positive lens (9) is 1 mm, the air gap between the second meniscus positive lens (9) and the second cemented doublet negative lens (10) is 6.72 mm, and the air gap between the second cemented doublet negative lens (10) and the third cemented doublet negative lens (11) is 1 mm. In the long-wave infrared projection lens group D: the air gap between the second biconvex positive lens (14) and the third meniscus positive lens (15) is 100.5 mm, the air gap between the third meniscus positive lens (15) and the first meniscus negative lens (16) is 0.95 mm, the air gap between the first meniscus negative lens (16) and the second meniscus negative lens (17) is 17.6 mm, the air gap between the second meniscus negative lens (17) and the third biconvex positive lens (18) is 3.25 mm, and the air gap between the third biconvex positive lens (18) and the fourth meniscus positive lens (19) is 95.1 mm. In the mid-wave infrared projection lens group E: the air gap between the five (21) and the six (22) meniscus positive lens is 97.35 mm, the air gap between the six (22) and the seven (23) meniscus positive lens is 98.48 mm, the air gap between the seven (23) and the three (24) meniscus negative lens is 0.86 mm, and the air gap between the three (24) and the four (25) biconvex positive lens is 0.95 mm.

2. The long exit pupil distance, wide-band common aperture composite analog optical system according to claim 1, characterized in that, In the wideband objective lens group A(2), the front surface 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(15) is aspherical and the rear surface is spherical; the front surface of the meniscus negative lens two(17) is spherical and the rear surface is aspherical; the front surface of the biconvex positive lens three(18) is spherical and the rear surface is aspherical and 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 mid-wave infrared projection lens group E, the front surface of the meniscus positive lens six(22) is aspherical and the rear surface is spherical; the front surface of the biconvex positive lens four(25) is spherical and the rear surface is aspherical; the front surface of the meniscus positive lens five(21), the meniscus positive lens seven(23), and the meniscus negative lens three(24) are spherical lenses.

3. The long exit pupil distance, wide-band common aperture composite analog optical system according to claim 1, characterized in that, The visible light mid-wave beam combiner (3) and mid-wave long-wave beam combiner (13) in the spatial beam combiner group B are both at a 45° angle to the optical axis; the plane mirror (6) in the visible light projection mirror group C is at a 45° angle to the optical axis.

4. The wide-band common-aperture composite analog optical system with long exit pupil distance according to claim 1, characterized in that, The operating wavelengths of the wide-band common-aperture composite analog optical system with long exit pupil distance are 0.55μm~0.75μm, 3μm~5μm, and 8μm~12μm, with a field of view of 8°×6°, a resolution of 1280×1024, exit pupil diameters of 35mm@0.55μm~0.75μm, 45mm@3μm~5μm, and 70mm@8μm~12μm, an exit pupil distance of 500mm, and an overlap of 0.006° between the simulated scenes in visible light, mid-wave infrared, and long-wave infrared.

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