A common light path compound eye optical system based on hexagonal ring arrangement

Abstract

The present invention is a common optical path compound eye optical system based on hexagonal annular arrangement, which solves the problems of small sub-aperture, low space utilization, narrow imaging spectrum range, insufficient integration of multi-band system, and inconsistent information collection in existing bionic compound eye optical systems. The system includes a curved multi-aperture array, an optical relay image receiving system, and an infrared two-color detector arranged in sequence; the curved multi-aperture array adopts a hexagonal annular arrangement, and the optical parameters of each sub-aperture unit are the same; the optical relay image receiving system is used to convert the focal curved surface image information obtained by the curved multi-aperture array into focal plane image information, which is then received by the plane detector; the infrared two-color detector is used to receive the dual-band image information collected by the sub-aperture units at different spatial positions; wherein the sub-aperture optical system and the relay image receiving system both adopt a dual-band common optical path imaging structure.

Description

Technical field:

[0001] The invention belongs to the technical field of bionic optics and infrared photoelectric detection, and relates to a common light path compound eye optical system based on hexagonal ring belt arrangement. Background technology:

[0002] In recent years, infrared imaging technology has been widely used. Compared with the visible light band, the infrared spectrum has a wider spectrum, so it contains more object information. In addition, infrared radiation has strong penetration and anti-interference capabilities, is not affected by the surrounding environment, and has no day or night restrictions. Among them, infrared medium waves (3-5μm) and long waves (8-12μm) are the two most widely used atmospheric windows, and they each have their own radiation characteristics. Infrared long waves have a stronger detection capability for targets close to heat sources or in stray noise environments, while infrared medium waves have a stronger detection capability for targets in humid and hot environments. Therefore, receiving and fusing infrared medium and long wave dual-band target imaging information has become the future development direction of infrared photoelectric detection equipment. Infrared imaging technology is widely used in defense, remote sensing, industry, medicine and other fields, such as infrared guidance equipment, infrared search and tracking systems, satellite infrared remote sensing exploration, etc.

[0003] The traditional imaging system belongs to a single-aperture imaging system. The single-aperture imaging system only records the light intensity distribution projected on the two-dimensional plane in the three-dimensional space, and cannot effectively obtain information such as the depth, precise position and movement speed of the target in the field of view. In addition, the large field of view and high resolution of the traditional single-aperture optical system are a pair of mutually restrictive factors, resulting in the optical system's inability to fully utilize its parallel processing capabilities. Although the ultra-wide-angle fisheye lens can achieve a large field of view, it has problems such as large aberrations and complex lens structure.

[0004] In nature, the compound eye structure of insects is composed of many small eyes (sub-eyes). Sub-eyes at different positions obtain a small part of the information of the large field of view image surface. The images obtained by all sub-eyes are stitched together to finally complete the acquisition of the entire object surface information. Compared with the monocular single-aperture vision system of mammals, the compound eye vision system has advantages that traditional single-aperture optical systems cannot match, such as large field of view, small volume, three-dimensional reconstruction of targets, rapid positioning and identification of moving objects, etc. Because biological compound eyes have many unique properties and functions, scientists apply the working principles of biological compound eyes to the design of optical systems, and the multi-aperture bionic compound eye optical system is born. Since the beginning of research, the multi-aperture bionic compound eye optical system has played a huge scientific research and application value in the fields of military, medical, and engineering applications.

[0005] At present, most bionic compound eye systems are designed as microlens array compound eyes, which have the advantages of large field of view and small size, but cannot overcome the limitations of small sub-eye aperture and short focal length on the detection distance of the system, and most of them are single-band imaging, which cannot achieve detection and identification of targets in all-weather and complex environments. Since dual-band compound eyes use multiple detectors to receive images, there is an inconsistency problem in multi-band information collection, and the sub-aperture arrangement is mostly the traditional curved circular arrangement. In summary, the bionic compound eye system currently still has problems such as small sub-aperture, narrow imaging spectral range, poor data collection consistency, and low space utilization. Summary of the invention:

[0006] The purpose of the present invention is to provide a common light path compound eye optical system based on a hexagonal ring arrangement, which overcomes the problems of small sub-aperture, narrow imaging spectral range, poor data acquisition consistency and low space utilization existing in the existing bionic compound eye optical system design. The present invention can realize long-focus long-distance detection, wide spectrum, high filling rate and compact bionic compound eye photoelectric imaging.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A common light path compound eye optical system based on hexagonal annular arrangement, characterized in that it comprises a curved surface multi-aperture array, an optical relay image receiving system and an infrared two-color detector arranged in sequence; wherein the curved surface multi-aperture array is arranged in a hexagonal annular arrangement model, and the optical parameters of each sub-aperture unit are the same, and it is used to collect infrared radiation emitted by a target in a large field of view scene and form a large-aperture focal curved surface infrared image, and the sub-aperture optical system is composed of a plurality of groups of infrared optical lenses; the optical relay image receiving system is used to convert the large-aperture focal curved surface infrared image information obtained by the curved surface multi-aperture array into focal plane infrared image information, which is then received by the infrared two-color detector, and the optical relay image receiving system is composed of a plurality of groups of infrared optical lenses; the infrared two-color detector is used to collect infrared dual-band image information received by sub-aperture units at different spatial positions received by the optical image relay system, and after analog-to-digital conversion, image splicing, image reconstruction and image processing links, the restored large-field infrared image information is displayed by a computer device.

[0009] The curved multi-aperture array and the optical relay image receiving system are both infrared dual-band common optical path imaging structures.

[0010] The sub-aperture optical system is a uniform optical system. The sub-aperture optical system is composed of zinc sulfide, zinc selenide and chalcogenide IRG series glass. It consists of four pieces of infrared glass, which are arranged as sub-aperture first lens, sub-aperture second lens, sub-aperture third lens and sub-aperture fourth lens in sequence. The rear surface of the sub-aperture second lens is an even-order aspherical surface concave to the image plane, and the surfaces of the other lenses are all spherical designs.

[0011] The optical relay image receiving system is composed of three infrared optical glasses, namely zinc sulfide, barium fluoride and germanium, in combination with chalcogenide IRG series glass. It consists of eight pieces of infrared glass, which are arranged in sequence as the first lens to the eighth lens of the relay system. The rear surface of the fourth lens is a binary diffraction surface concave to the image plane. The eighth lens is a convex lens, and its front and rear surfaces are both even-order aspherical surfaces. The surfaces of the remaining lenses are all spherical surfaces. A detector protection glass is arranged behind the eighth lens.

[0012] A cold aperture of the optical relay image receiving system is arranged behind the rear surface of the detector protection glass.

[0013] The angle between adjacent sub-aperture optical axes of the curved multi-aperture array is 8.7°, the field angle of each imaging sub-aperture is 9°, and the curvature radius of the curved multi-aperture array substrate is 111 mm.

[0014] The focal length of the sub-aperture optical system is 48mm, the relative aperture is 1 / 3, and the maximum aperture is less than 17mm.

[0015] The focal length of the optical relay image receiving system is 7.14mm, the relative aperture is 1 / 2, the field of view angle is 99°, the radius of curvature of the large field of view curved object surface is 85mm, the semi-aperture of the curved object surface is 61.76mm, and the maximum aperture of the optical relay image receiving system is less than 81mm;

[0016] The large-aperture infrared dual-band common-path compound eye optical system arranged in hexagonal rings has a total synthetic field of view of 98°×85°, a relative aperture of 1 / 2, a maximum total mechanical aperture of less than 200mm, and a total optical length of 240mm.

[0017] The infrared dual-color detector is a cooled infrared detector with a target size of 12.29mm; the resolution of the infrared dual-color detector is 320×256, and the pixel size is 30μm; the working band of the infrared dual-color detector is 3.7~4.8μm and 7.7~9.5μm.

[0018] Compared with the prior art, the present invention has the following advantages and effects:

[0019] 1. The present invention belongs to a large-aperture bionic compound eye optical system. Compared with the traditional microlens array compound eye, it overcomes the limitation of small sub-eye aperture and short focal length on the detection distance of the system, and improves the detection capability of the bionic compound eye optical system;

[0020] 2. The neutron aperture array of the present invention adopts a hexagonal ring arrangement model, which has a higher space utilization rate and a more compact arrangement compared with the common circular arrangement model of the traditional large-aperture bionic compound eye, and also improves the light energy utilization rate of the bionic compound eye system;

[0021] 3. The bionic compound eye optical system proposed in the present invention adopts infrared medium-wave / long-wave dual-band imaging for the first time, which solves the problem of limited target information acquisition by single-band imaging of the traditional compound eye system, realizes all-weather detection of the compound eye system, and improves the ability of the compound eye system to identify targets in complex environments;

[0022] 4. The neutron aperture optical system and the optical image transfer receiving system of the present invention both adopt a dual-band common optical path imaging structure and are equipped with an infrared dual-color detector for reception for the first time. Compared with the dual-band split optical path multi-detection imaging bionic compound eye system, the compactness of the system structure and the consistency of multi-band acquisition information are improved;

[0023] 5. The common optical path compound eye system with hexagonal ring arrangement proposed in the present invention has the characteristics of high space utilization, wide imaging spectrum range, multi-band integration, and good consistency of information collection. It is suitable for all-weather multi-target detection and identification, UAV reconnaissance and other fields in complex environments. Description of the drawings:

[0024] Figure 1 This is a schematic diagram of the common light path compound eye optical system based on the hexagonal ring arrangement of the present invention;

[0025] Figure 2 This is a diagram of the hexagonal ring arrangement model of the present invention;

[0026] Figure 3 This is a schematic diagram of the projection of sub-apertures arranged in a hexagonal ring belt according to the present invention;

[0027] Figure 4 This is a schematic diagram of the projection of sub-apertures arranged in a circular manner on a reference group of curved surfaces of the present invention;

[0028] Figure 5 This is a diagram of the imaging optical path structure of the sub-aperture optical system of the present invention;

[0029] Figure 6 It is a two-dimensional diagram of all subapertures arranged in the meridian section direction (XOZ plane) of the hexagonal annular array model;

[0030] Figure 7 This is a three-dimensional model diagram of the arranged 4-layer sub-aperture array;

[0031] Figure 8 This is the imaging optical path structure diagram of the optical relay image receiving system;

[0032] Fig. 9 The imaging optical path diagram of the combined hexagonal annular arrangement of the common optical path compound eye optical system in the meridian section direction (XOZ plane);

[0033] Fig.10 The light path diagram of the three-dimensional imaging structure of the combined hexagonal ring-shaped common light path compound eye optical system;

[0034] Fig.11 The MTF curves of the modulation transfer function generated by simulating the center and edge imaging sub-channels respectively using ZEMAX optical design software;

[0035] (a) Central subchannel medium wave band;

[0036] (b) long wave band of the central subchannel;

[0037] (c) edge subchannel mid-wave band;

[0038] (d) edge subchannel long wave band;

[0039] Fig.12 The RMS wavefront difference field of view diagram generated by simulating the center and edge imaging sub-channels respectively using ZEMAX optical design software;

[0040] (a) Central subchannel medium wave band;

[0041] (b) long wave band of the central subchannel;

[0042] (c) edge subchannel mid-wave band;

[0043] (d) edge subchannel long wave band;

[0044] In the figure: 1-curved multi-aperture array, 2-optical relay image receiving system, 3-infrared dual-color detector, 4-sub-aperture optical system, 5-front surface of sub-aperture first lens, 6-rear surface of sub-aperture first lens, 7-front surface of sub-aperture second lens, 8-rear surface of sub-aperture second lens, 9-front surface of sub-aperture third lens, 10-rear surface of sub-aperture third lens, 11-front surface of sub-aperture fourth lens, 12-rear surface of sub-aperture fourth lens, 13-sub-aperture image plane, 14-curved object surface of optical relay image receiving system, 15-front surface of relay system first lens, 16-rear surface of relay system first lens, 17-front surface of relay system second lens, 18-relay system first lens The back surface of the second lens, 19- the front surface of the third lens of the relay system, 20- the back surface of the third lens of the relay system, 21- the front surface of the fourth lens of the relay system, 22- the back surface of the fourth lens of the relay system, 23- the front surface of the fifth lens of the relay system, 24- the back surface of the fifth lens of the relay system, 25- the front surface of the sixth lens of the relay system, 26- the back surface of the sixth lens of the relay system, 27- the front surface of the seventh lens of the relay system, 28- the back surface of the seventh lens of the relay system, 29- the front surface of the eighth lens of the relay system, 30- the back surface of the eighth lens of the relay system, 31- the front surface of the detector protection glass, 32- the back surface of the detector protection glass, 33- cold stop, 34- the image plane of the relay system. Specific implementation method:

[0045] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0046] The present invention is a common optical path compound eye optical system based on hexagonal annular arrangement, comprising a curved surface multi-aperture array 1, an optical relay image receiving system 2 and an infrared two-color detector 3 arranged in sequence. The curved surface multi-aperture array 1 is arranged in a hexagonal annular arrangement model, and the optical parameters of each sub-aperture unit are the same. It is used to collect infrared radiation emitted by a target in a large field of view scene and form a large-aperture focal curved surface infrared image. The sub-aperture optical system 4 is composed of multiple groups of infrared optical lenses. The optical relay image receiving system 2 is used to convert the large-aperture focal curved surface infrared image information obtained by the curved surface multi-aperture array 1 into focal plane infrared image information, which is then received by the infrared two-color detector. The optical relay image receiving system 2 is composed of multiple groups of infrared optical lenses. The infrared two-color detector 3 is used to collect infrared dual-band image information received by sub-aperture units at different spatial positions received by the optical relay image receiving system 2, and after analog-to-digital conversion, image splicing, image reconstruction and other image processing links, the restored large-field infrared image information is displayed by a computer device.

[0047] The curved multi-aperture array 1 and the optical relay image receiving system 2 are both designed as infrared dual-band common optical path imaging structures.

[0048] The sub-aperture optical system 4 is composed of zinc sulfide, zinc selenide and chalcogenide IRG series glass, and is composed of four pieces of infrared glass. The rear surface 8 of the sub-aperture second lens is an even-order aspherical surface concave to the image plane, and the remaining surfaces are all spherical designs.

[0049] The optical relay image receiving system 2 is composed of three infrared optical glasses of zinc sulfide, barium fluoride and germanium in combination with chalcogenide IRG series glass, and is composed of eight pieces of infrared glass in total, wherein the rear surface 22 of the fourth lens is a binary diffraction surface concave toward the image plane, and the eighth lens is a convex lens, whose front and rear surfaces are both even-order aspherical surfaces, and the remaining surfaces are all spherical designs.

[0050] The angle between adjacent sub-aperture optical axes of the curved multi-aperture array 1 is 8.7°, the field angle of each imaging sub-aperture is 9°, and the curvature radius of the curved multi-aperture array 1 substrate is 111mm. The focal length of the sub-aperture system is 48mm, the relative aperture is 1 / 3, and the maximum aperture is less than 17mm;

[0051] The focal length of the optical relay image receiving system 2 is 7.14mm, the relative aperture is 1 / 2, the field angle is 99°, the radius of curvature of the large field object surface is 85mm, the semi-aperture of the curved object surface is 61.76mm, and the maximum aperture of the optical relay image receiving system 2 is less than 81mm. The aperture STO of the optical relay image receiving system 2 is set at the last position of the system, so that the exit pupil of the optical system coincides with the cold aperture 33 of the infrared two-color refrigerated detector, achieving 100% cold aperture efficiency.

[0052] The dual-band common optical path compound eye optical system arranged in hexagonal rings has a total synthetic field of view of 98°×85°, a relative aperture of 1 / 2, a maximum mechanical aperture of less than 200mm, and a total optical length of 240mm.

[0053] The infrared two-color detector 3 is a cooling infrared detector with a target size of 12.29 mm; the resolution of the infrared two-color detector 3 is 320×256, and the pixel size is 30 μm; the working bands of the infrared two-color detector 3 are 3.7-4.8 μm and 7.7-9.5 μm.

[0054] Example:

[0055] like Figure 1 As shown, the common optical path compound eye optical system arranged in hexagonal annular belts includes a curved multi-aperture array 1, an optical relay image receiving system 2, and an infrared two-color detector 3 arranged in sequence from the object side to the image side. The curved multi-aperture array 1 is used to collect target information within a large field of view, and the main body is obtained by a plurality of sub-aperture optical systems 4 arranged in a hexagonal annular belt model array.

[0056] Figure 2 This is a model diagram of hexagonal ring arrangement, in which the subapertures on the same layer are all located on the same regular hexagon, and the intervals between adjacent rings are the same, extending from the center of the spherical shell base to the periphery in the form of regular hexagonal rings. The small circles arranged in hexagonal rings in the figure represent the optical systems of each subaperture, and the large circles represent the curved spherical shell base. The projection filling factor is defined as the ratio of the sum of the areas of all projected subapertures to the area of ​​the minimum circumscribed projected spherical shell. Its size reflects the density of the subaperture arrangement on the base surface, and characterizes the level of space utilization of the compound eye system. The subapertures arranged on the curved surface are all projected onto the XOY plane, and the XOY plane is defined as the bottom surface of all subaperture projections. Figure 3 This is a schematic diagram of the projection of sub-apertures arranged in a hexagonal ring. Figure 4 This is a schematic diagram of the projection of the sub-aperture arranged in a circular pattern on a curved surface. The projection filling factor theory is used to prove that when the optical parameters of the sub-apertures are the same, the filling factor of the hexagonal annular arrangement model is 11.73% higher than that of the traditional circular pattern, so it has a higher space utilization rate.

[0057] Figure 5The following is a diagram of the imaging optical path structure of the sub-aperture optical system 4. The sub-aperture optical system 4 adopts the infrared medium-wave / long-wave confocal common optical path form, and contains four infrared lenses in total. The rear surface 8 of the second lens is an even-order aspheric surface concave to the image plane, and the remaining surfaces are all spherical designs. Common zinc sulfide and zinc selenide are used in combination with chalcogenide IRG glass. Zinc sulfide and zinc selenide have good refractive index uniformity and high transmittance in infrared medium-wave and long-wave. Chalcogenide glass has a low refractive index temperature coefficient dn / dt and dispersion coefficient, which is conducive to infrared dual-band confocal and athermal processing.

[0058] The basic optical parameters of the sub-aperture optical system 4 in this specific embodiment are shown in Table 1.

[0059] Table 1 Basic optical parameters of sub-aperture optical system 4

[0060]

[0061] The detailed optical data of the sub-aperture optical system 4 in this specific embodiment are shown in Table 2.

[0062] Table 2 Detailed optical data of sub-aperture optical system 4

[0063]

[0064] Detailed parameter data of the even-order aspheric surface of the surface 8 in the sub-aperture optical system 4 are shown in Table 3.

[0065] Table 3 Specific optical parameters of the even-order aspheric surface 8 in the sub-aperture optical system 4

[0066]

[0067] The equations for the object side and image side curves of an aspheric lens are expressed as follows:

[0068]

[0069] Where: z is the height of the aspheric surface at a height of h along the optical axis, from the vertex of the aspheric surface; c is the curvature of the vertex of the aspheric surface; k is the cone coefficient (conic); is the radial distance; α 1 ~a 4 All are high-order coefficients;

[0070] Figure 6 It is a two-dimensional diagram of all subapertures arranged in the meridian section direction (XOZ plane) of the hexagonal annular array model. Figure 7 The three-dimensional model diagram of the arranged 4-layer sub-aperture array, where the number of sub-apertures n and the number of hexagonal layers S satisfy n = 3S 2-3S+1 relationship, there is no collision or overlap between all sub-apertures in the model, and the air spacing between them leaves a certain margin value for the supporting mechanical structure of the compound eye system; there is no overlapping area between the imaging surfaces of adjacent sub-apertures on the focal surface, ensuring that no image aliasing will occur when the sub-aperture images are collected later.

[0071] The optical relay image receiving system 2 is used to convert the large-aperture focal curved surface infrared image information obtained by the curved multi-aperture array into focal plane infrared image information, which is then received by the infrared dual-color detector 3 and restored to a large-field-of-view object surface scene through image stitching, image reconstruction and other algorithm processing. The optical relay image receiving system 2 should have an object surface with the same curvature radius as the focal curved surface of the curved multi-aperture array, and the object surface aperture of the optical relay image receiving system 2 needs to be larger than the sub-aperture focal curved surface aperture to ensure that all light emitted by the sub-apertures can be received by the optical relay image receiving system 2.

[0072] Figure 8 This is a diagram of the imaging optical path structure of the optical relay image receiving system 2. The optical relay image receiving system 2 adopts the infrared medium wave / long wave confocal common optical path form, and contains eight infrared lenses in total. The rear surface 22 of the fourth lens is a binary diffraction surface concave to the image plane, and the eighth lens is a convex lens. Its front and rear surfaces are both even-order aspherical surfaces, and the remaining surfaces are all spherical designs. It adopts three infrared optical glasses of zinc sulfide, barium fluoride, and germanium with chalcogenide IRG series glass.

[0073] The basic optical parameters of the optical relay image receiving system 2 in this specific embodiment are shown in Table 4.

[0074] Table 4 Basic optical parameters of optical relay image receiving system 2

[0075]

[0076] The detailed optical data of the optical relay image receiving system 2 in this specific embodiment are shown in Table 5.

[0077] Table 5 Detailed optical data of optical relay image receiving system 2

[0078]

[0079]

[0080] Specific parameters of the binary diffraction surface of the surface 22 in the optical relay image receiving system 2 are shown in Table 6.

[0081] Table 6 Specific optical parameters of the binary diffraction surface of surface 22 in the optical relay image receiving system 2

[0082]

[0083] Detailed data of the even-order aspheric surfaces of the front surface 29 of the eighth lens and the rear surface 30 of the eighth lens in the optical relay image receiving system 2 are shown in Table 7.

[0084] Table 7 Specific optical parameters of even-order aspheric surfaces of surface 29 and surface 30 in optical relay image receiving system 2

[0085]

[0086] The infrared dual-color detector 3 is used to collect infrared dual-band image information received by the sub-aperture optical system 4 at different spatial positions received by the optical image relay receiving system 2, and after analog-to-digital conversion, image stitching, image reconstruction and other image processing links, the restored large-field infrared image information is displayed through computer equipment.

[0087] The infrared two-color detector 3 is a cooling type infrared medium-wave and long-wave two-color detector, with an operating band of 3.7-4.8 μm and 7.7-9.5 μm, a resolution of 320×256, a pixel size of 30 μm, and a target surface size of 12.29 mm;

[0088] The splicing combination of the curved multi-aperture array 1 and the optical relay image receiving system 2 must follow the pupil connection principle, that is, the exit pupil of the sub-aperture optical system 4 must coincide with the entrance pupil position of the optical relay image receiving system 2. In addition, the four basic requirements for docking must be met: (1) The object plane range of the optical relay image receiving system should be larger than the focal surface aperture of the curved multi-aperture array, and the two should have the same radius of curvature; (2) The aperture value of the first lens of the optical relay image receiving system should be larger than the light area range of the two sub-aperture optical systems at the edge position (±43.5°) projected to the optical relay image receiving system; (3) The light beam aperture angle of each sub-aperture optical system should be less than or equal to the aperture angle of the optical relay image receiving system; (4) The optical axis of the sub-aperture optical system at different spatial positions should be at an angle of 0° with the main light of the corresponding optical relay image receiving system.

[0089] Fig. 9 This is the imaging optical path diagram of the combined hexagonal annular arrangement of the common optical path compound eye optical system in the meridian section direction (XOZ plane). The figure only shows the schematic diagram of the imaging of the main light rays of each field of view, where the rotation angles of the optical axes of each sub-aperture optical system on the XOZ plane relative to the optical axis of the central sub-aperture optical system are 0°, ±8.7°, ±17.4°, ±26.1°, ±34.8°, and ±43.5°, respectively. The exit pupil of the compound eye combination system coincides with the cold aperture of the two-color cooled detector, and the system achieves 100% cold aperture efficiency.

[0090] The imaging unit field angle of a single sub-aperture optical system in the common optical path compound eye optical system arranged in hexagonal annuli is 9°, the angle between adjacent sub-aperture optical axes is 8.7°, the number of sub-apertures is 91, the focal length is 48 mm, the focal length of the optical relay image receiving system is 7.14 mm, the total focal length of the system is 32.24 mm, the total synthetic field of view is 98°×85°, the relative aperture is 1 / 2, the maximum mechanical aperture is less than 200 mm, the total optical length is 240 mm, and a target of 2 m in size at a working distance of 1 km can be detected.

[0091] Fig.10 This is the three-dimensional imaging structure light path diagram of the combined hexagonal ring-arranged common light path compound eye optical system. In the figure, 4 layers of 37 sub-aperture systems are arranged.

[0092] Fig.11 The figure shows the modulation transfer function MTF curve diagram generated by simulating the center and edge imaging sub-channels respectively using ZEMAX optical design software in the present invention, wherein the abscissa represents the spatial frequency and the ordinate represents the MTF value. Fig.11 (a), 11(b), 11(c), and 11(d) show that at a spatial frequency of 17lp / mm, the MTF values ​​of the center and edge sub-channels in the infrared mid-wave / long-wave operating band are both above 0.5 and close to the diffraction limit, indicating that the imaging performance of the present invention is good.

[0093] Fig.12 The figure shows the RMS wavefront difference field diagram generated by simulating the central and edge imaging sub-channels respectively using ZEMAX optical design software in the present invention, wherein the horizontal and vertical coordinates represent the RMS wavefront difference values ​​at each field point on the image plane in the XY directions respectively. Fig.12 (a), 12(b), 12(c), and 12(d) show that the maximum RMS wavefront difference of the center and edge sub-channels in the infrared mid-wave / long-wave working band is 0.0775λ, close to 1 / 14λ, and the imaging quality of each sub-channel is good.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any equivalent structural changes made using the contents of the description and drawings of the present invention should be included in the patent protection scope of the invention.

Claims

1. A common light path compound eye optical system based on hexagonal ring arrangement, characterized in that: The invention comprises a curved surface multi-aperture array (1), an optical relay image receiving system (2) and an infrared two-color detector (3) which are arranged in sequence; wherein the curved surface multi-aperture array (1) is arranged in a hexagonal ring belt arrangement model, and the optical parameters of each sub-aperture unit are the same, and is used to collect infrared radiation emitted by a target in a large field of view scene and form a large-aperture focal curved surface infrared image, and the sub-aperture optical system (4) is composed of a plurality of groups of infrared optical lenses; the optical relay image receiving system (2) is used to convert the large-aperture focal curved surface infrared image information obtained by the curved surface multi-aperture array (1) into focal plane infrared image information, which is then received by the infrared two-color detector (3), and the optical relay image receiving system (2) is composed of a plurality of groups of infrared optical lenses; the infrared two-color detector (3) is used to collect infrared dual-band image information received by the sub-aperture units at different spatial positions received by the optical relay image system, and after analog-to-digital conversion, image stitching, image reconstruction and image processing, the restored large-field infrared image information is displayed by a computer device; The sub-aperture optical system (4) is a uniform optical system. The sub-aperture optical system (4) is formed by zinc sulfide, zinc selenide and sulfur-based IRG series glass. It is composed of four infrared glasses, which are arranged in sequence as a sub-aperture first lens, a sub-aperture second lens, a sub-aperture third lens and a sub-aperture fourth lens. The rear surface (8) of the sub-aperture second lens is an even-order aspheric surface concave toward the image plane, and the surfaces of the other lenses are all spherical designs. The optical relay image receiving system (2) is composed of three infrared optical glasses, namely zinc sulfide, barium fluoride and germanium, in combination with sulfur-based IRG series glass. It is composed of eight pieces of infrared glass, which are arranged in sequence as the first lens of the relay system to the eighth lens of the relay system, wherein the rear surface (22) of the fourth lens is a binary diffraction surface concave toward the image plane, the eighth lens is a convex lens, and its front and rear surfaces are both even-order aspherical surfaces, and the remaining lens surfaces are all spherical surfaces; a detector protection glass is arranged behind the eighth lens.

2. The common light path compound eye optical system based on hexagonal annular arrangement according to claim 1, characterized in that: The curved multi-aperture array (1) and the optical relay image receiving system (2) are both infrared dual-band common optical path imaging structures.

3. The common light path compound eye optical system based on hexagonal annular arrangement according to claim 2, characterized in that: An optical relay image receiving system cold diaphragm (33) is arranged behind the rear surface (32) of the detector protection glass.

4. The common light path compound eye optical system based on hexagonal annular arrangement according to claim 3, characterized in that: The angle between adjacent sub-aperture optical axes of the curved multi-aperture array (1) is 8.7°, the field angle of each imaging sub-aperture is 9°, and the curvature radius of the base of the curved multi-aperture array (1) is 111 mm.

5. The common light path compound eye optical system based on hexagonal annular arrangement according to claim 4, characterized in that: The focal length of the sub-aperture optical system (4) is 48 mm, the relative aperture is 1 / 3, and the maximum aperture is less than 17 mm.

6. The common light path compound eye optical system based on hexagonal annular arrangement according to claim 5, characterized in that: The focal length of the optical relay image receiving system (2) is 7.14mm, the relative aperture is 1 / 2, the field of view angle is 99°, the radius of curvature of the large field of view curved object surface is 85mm, the semi-aperture of the curved object surface is 61.76mm, and the maximum aperture of the optical relay image receiving system is less than 81mm.

7. The common light path compound eye optical system based on hexagonal annular arrangement according to claim 6, characterized in that: The large-aperture infrared dual-band common-path compound eye optical system arranged in hexagonal rings has a total synthetic field of view of 98°×85°, a relative aperture of 1 / 2, a maximum total mechanical aperture of less than 200mm, and a total optical length of 240mm.

8. The common light path compound eye optical system based on hexagonal annular arrangement according to claim 7, characterized in that: The infrared dual-color detector (3) is a cooling type infrared detector with a target surface size of 12.29 mm; the infrared dual-color detector (3) has a resolution of 320×256 and a pixel size of 30 μm; and the infrared dual-color detector (3) has an operating band of 3.7 to 4.8 μm and 7.7 to 9.5 μm.

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