Light and small athermalization infrared high-sensitivity camera structure

Abstract

The invention discloses a light and small athermalization infrared high-sensitivity camera structure, and belongs to the technical field of space cameras. Incident light is divided into a medium-wave spectrum band and a long-wave spectrum band through a color separation film, each spectrum band is subdivided into five sub-spectrum bands through a filter wheel, infrared ten-spectrum-band imaging is achieved, and the spectrum band ranges from 3.7 micrometers to 4.8 micrometers and from 8 micrometers to 12.5 micrometers. All components of the camera are installed on the same substrate, a light path is folded through the folding mirror, the structure is compact, the size is small, and the weight is light; the camera adopts athermalization design, and the camera normally images in a temperature range from-55 DEG C to + 60 DEG C in a state without thermal control equipment.

Description

Technical Field

[0001] The present invention relates to a light and small athermal infrared high-sensitivity camera structure, belonging to the technical field of space cameras, in particular to a light and small athermal infrared multi-spectral camera carried on a stratospheric floating platform or an aviation airborne platform, with a working spectrum of mid-wave infrared 3.7um-4.8um and a long-wave spectrum of 8um-12.5um. Background Art

[0002] High-resolution infrared imaging of the Earth in the stratosphere is a hot topic of current research. The environment of the stratosphere is characterized by low temperature and low pressure. The carrying capacity and power supply capacity of airships flying in the stratosphere are limited. The equipment carried on them must be small in size, light in weight, and low in power consumption. The current satellite-borne cameras cannot meet the requirements of high-sensitivity imaging of temperature on stratospheric airship platforms. The main reasons are as follows:

[0003] (1) Infrared optical materials have different refractive indices at different temperatures. This causes the focal length of cameras installed and tested in laboratory environments to change in high or low temperature environments, resulting in the inability to clearly image the camera, and the reduction of spatial resolution and temperature resolution. Therefore, current satellite-borne and airborne cameras have a complete temperature control system, which consists of a thermal controller, a heating device, and a radiation heat dissipation device. The entire system is heavy, power-hungry, and large in size, and the system is complex. When the ambient temperature is lower than the normal operating temperature range of the camera, the thermal controller controls the heating plate to heat the camera; when the camera's own temperature is higher than the normal operating temperature range, the radiation heat dissipation device starts to radiate the heat to ensure that the camera temperature does not exceed the allowable temperature range. In the stratospheric environment, due to the limitation of power supply capacity, the platform layer floating platform cannot provide sufficient heating power consumption for the camera; at the same time, due to the weight and volume limitations of the aerostat pod, the camera cannot carry a radiation heat dissipation device. Therefore, the current satellite-borne cameras cannot be adapted to the current stratospheric aerostat pod.

[0004] (2) The infrared imaging spectrum of the camera is in the mid-wave infrared range of 3.7um to 4.8um and 8um to 12.5um. The spectrum is relatively wide and the infrared detector is not sensitive in this spectrum range. Currently, the infrared noise equivalent temperature difference (NETD) of the same type of satellite-borne infrared cameras in the mid-wave spectrum is about 30mK and the infrared noise equivalent temperature difference (NETD) in the long-wave spectrum is about 100mK, with low temperature resolution.

[0005] (3) Currently, satellite-borne infrared cameras do not have the ability to perform filter splitting and ten-band imaging.

[0006] (4) Currently, satellite-borne infrared cameras are not capable of operating normally in the temperature range of -55°C to +60°C. Summary of the invention

[0007] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and provide a lightweight, small, athermal infrared high-sensitivity camera structure, which uses a color separation plate to divide the incident light into a medium-wave spectrum and a long-wave spectrum, and each spectrum is further subdivided into five sub-spectral bands by a filter wheel, thereby realizing infrared ten-spectral band imaging.

[0008] The technical solution of the present invention is: a light and small athermal infrared high-sensitivity camera structure, comprising:

[0009] The base plate of the double-layer frame is the load-bearing structure of the camera, which is used to install the color separation film assembly, the medium wave channel and the long wave channel, and includes an upper plate and a lower plate; the upper plate is used to install the camera electronic equipment, and the lower plate is provided with a light inlet; the color separation film assembly is hoisted on the upper plate;

[0010] The color separation film component has a surface coating layer, which is used to separate the medium-wave and long-wave spectrum of the incident light, reflect the medium-wave spectrum light into the medium-wave channel, and transmit the long-wave spectrum light into the long-wave channel;

[0011] The medium wave channel is installed on the substrate, receives the incident light of the medium wave spectrum reflected by the color separation filter assembly, and subdivides the spectrum into five sub-spectral bands through the medium wave filter wheel to achieve medium wave five-spectral band imaging;

[0012] The long-wave channel is installed on the substrate, receives the incident light of the long-wave spectrum band transmitted by the color separation film assembly, and subdivides the spectrum band into 5 sub-spectral bands through the long-wave filter wheel to achieve long-wave 5-spectral band imaging.

[0013] Furthermore, the substrate also includes vertical plates; the vertical plates isolate the double-layer frame structure of the substrate into different areas, so as to strengthen the rigidity of the double-layer frame structure and shield external stray light.

[0014] Furthermore, the lower surface of the lower plate is the reference surface of the camera, the assembly and testing of the camera optical components are based on the lower surface of the lower plate, and the mechanical processing of the substrate is based on the lower surface of the lower plate.

[0015] Furthermore, the color separation film assembly includes a color separation film, a color separation film bracket, and an adhesive spot; the color separation film is fixedly connected to the color separation film bracket, and a circular adhesive spot is injected into the gap between the two through a small hole on the side of the color separation film bracket. The adhesive spot has a thickness of 0.3 mm and a diameter of 3 mm, and there are eight of them in total, which are distributed in a circle on the outer side of the color separation film; the light incident surface coating layer of the color separation film is used to reflect the medium-wave spectrum and transmit the long-wave spectrum, and the exit surface of the color separation film is coated with an anti-reflection film.

[0016] Furthermore, the color separation sheet is a circular plane lens with a diameter of 55 mm and a thickness of 3 mm; the color separation sheet material is zinc tin, the color separation sheet bracket material is aluminum alloy, and is bonded to the color separation sheet bracket. The bonding glue is low-temperature silicone rubber, which is used to compensate for the mismatch between thermal expansion and contraction of the two.

[0017] Further, the medium wave channel includes a medium wave front lens group, a medium wave folding mirror, a medium wave focusing lens group, a medium wave rear lens group, a medium wave filter wheel assembly, and a medium wave detector refrigerator assembly;

[0018] The medium wave front lens group includes a medium wave front lens barrel, a medium wave front lens bracket, and a first medium wave front lens and a second medium wave front lens. The two medium wave front lenses are fixedly connected in the medium wave front lens barrel; the medium wave front lens barrel is installed on the medium wave front lens bracket; the medium wave front lens bracket is hoisted on the upper plate; the surfaces of the first medium wave front lens and the second medium wave front lens are plated with anti-reflection films that transmit the medium wave spectrum; the surfaces of the medium wave front lens barrel and the medium wave front lens bracket are black anodized; the medium wave front lens group is hoisted and installed on the upper plate;

[0019] The medium fold mirror is a reflector, and its mirror body and bracket are an integrated structure. The material is aluminum alloy material used for space reflectors, the reflective surface is plated with aluminum film, and the surface of other parts is black anodized. The bracket of the reflector is fixed to the lower plate by 3 screws, and the screw holes are cut with 0.5mm unloading grooves.

[0020] The medium wave focusing lens assembly 3-3 includes a medium wave focusing spherical lens, a medium wave focusing lens frame, a medium wave focusing lens bracket, a focusing mechanism, and a focusing mechanism mounting seat; the medium wave focusing spherical lens is bonded to the medium wave focusing lens frame, and the bonding glue is low-temperature silicone rubber; the outer side of the medium wave focusing lens frame is processed with threads and fixed to the medium wave focusing lens bracket through a thread pair; the focusing mechanism is fixed to the focusing mechanism mounting seat through 4 screws; the medium wave focusing spherical lens is made of single crystal silicon, and the surface is coated with an anti-reflection film that transmits the medium wave spectrum; the medium wave focusing lens frame, the medium wave focusing lens bracket, and the focusing mechanism mounting seat are all made of aluminum alloy, and the surface is black anodized; the focusing mechanism is a one-dimensional lifting platform, which is used for the one-dimensional movement of the medium wave focusing spherical lens along the central axis direction, and the movement range is ±6mm;

[0021] The medium wave rear lens group includes a first medium wave rear lens, a second medium wave rear lens, a third medium wave rear lens, a medium wave rear lens barrel, and a medium wave rear lens support; the first medium wave rear lens, the second medium wave rear lens, and the third medium wave rear lens are bonded to corresponding positions in the inner cavity of the medium wave rear lens barrel, and the bonding glue is low-temperature silicone rubber; threads are processed on the outer side of the medium wave rear lens barrel, and the medium wave rear lens support is installed on the medium wave rear lens support through a thread pair; the three medium wave rear lenses are all spherical lenses, made of single crystal silicon, and coated with an anti-reflection film that transmits the medium wave spectrum; the medium wave rear lens barrel and the medium wave rear lens support are made of aluminum alloy, and the surface is black anodized; the medium wave rear lens support is installed on the lower plate through 4 screws;

[0022] The medium wave filter wheel assembly includes a filter, a filter frame, a turntable, a motor, a gear pair, a bearing, and a medium wave filter wheel mounting seat; the filter is bonded to the filter frame, and the bonding glue is low-temperature silicone rubber; the filter frame is fixed to the turntable by 3 screws; the gear pair is mounted on the medium wave filter wheel mounting seat through the bearing; the motor drives the turntable to rotate through the gear pair; the filter material is single crystal germanium, a total of 5 pieces, mounted on the turntable, each filter film layer is different from each other, used to transmit light of different spectrum bands;

[0023] The medium wave detector refrigerator assembly includes a dewar, a refrigerator, and a medium wave detector refrigerator bracket; the medium wave detector refrigerator bracket is made of aluminum alloy material, and the surface is black anodized; the dewar and refrigerator are installed on the bracket, and the bracket is installed on the lower plate of the base plate;

[0024] The medium wave folding mirror, the medium wave focusing lens group, the medium wave rear lens group and the medium wave filter wheel assembly are installed on the lower plate.

[0025] Furthermore, the two medium wave front lenses are bonded in the medium wave front lens barrel, and the bonding glue is low-temperature silicone rubber; threads are processed on the outer side of the medium wave front lens barrel and installed on the medium wave front lens bracket through a thread pair; the first medium wave front lens and the second medium wave front lens are made of single crystal silicon, and the medium wave front lens barrel and the medium wave front lens bracket are made of aluminum alloy; the medium wave front lens bracket is hoisted to the upper plate by 4 screws.

[0026] Further, the long-wave channel includes a long-wave focusing lens assembly, a long-wave folding mirror assembly, a long-wave lens assembly, a long-wave filter wheel assembly, and a long-wave detector refrigerator assembly;

[0027] The long-wave focusing lens assembly includes a long-wave focusing lens, a long-wave focusing lens frame, a long-wave focusing lens bracket, a one-dimensional lifting platform, and a long-wave focusing lens base; the long-wave focusing lens is a spherical mirror, fixedly connected in the long-wave focusing lens frame, and the bonding glue is low-temperature silicone rubber; the long-wave focusing lens frame is installed on the long-wave focusing lens bracket; the long-wave focusing lens bracket is installed on the one-dimensional lifting platform; the lifting platform is installed on the long-wave focusing lens base; the long-wave focusing lens base is installed on the lower plate; the surface of the long-wave focusing lens is plated with an anti-reflection film that transmits the long-wave spectrum;

[0028] The long wave fold mirror assembly includes a long wave fold mirror and a long wave fold mirror bracket; the number of the long wave fold mirrors is 2, which are used to fold the light path and are installed on the long wave fold mirror bracket through 3 screws; the long wave fold mirror bracket is installed on the lower plate through 4 screws; the surface of the long wave fold mirror is coated with an aluminum reflective film, and the surface of the long wave fold mirror bracket is black anodized;

[0029] The long-wave lens assembly comprises a first long-wave lens, a second long-wave lens, a third long-wave lens, an inner lens barrel, an outer lens barrel and a long-wave lens base; the first long-wave lens is bonded to the inner side of the inner lens barrel, and the bonding glue is low-temperature silicone rubber; the second long-wave lens and the third long-wave lens are bonded to the inner side of the outer lens barrel, and the bonding glue is low-temperature silicone rubber; the openings at both ends of the inner lens barrel are different in size, and an internal thread is processed on the side with the larger opening, and an external thread matching therewith is processed on the side with the larger opening of the outer lens barrel, and the two are fixed by a thread pair; an external thread is processed on the outer side of the middle part of the outer lens barrel, which matches with the internal thread of the long-wave lens base, and is fixed to the long-wave lens base by a thread pair; the long-wave lens base is mounted on the lower plate by 4 screws; the materials of the first long-wave lens, the second long-wave lens and the third long-wave lens are all single-crystal germanium, and the surface is coated with an anti-reflection film that transmits the long-wave spectrum; the inner lens barrel, the outer lens barrel and the long-wave lens base are all made of aluminum alloy, and the surface is black anodized; the long-wave lens assembly is hoisted and mounted on the upper plate;

[0030] The structures of the long-wave filter wheel assembly and the medium-wave filter wheel assembly are the same except that the surface film layer of the five filters is an anti-reflection film used to increase the transmittance of the long-wave spectrum; the long-wave focusing lens assembly, the long-wave folding mirror assembly, and the long-wave filter wheel assembly are installed on the lower plate;

[0031] The long-wave detector refrigerator assembly comprises a Dewar assembly and a refrigerator assembly, and the two are independently mounted on a vertical plate of a base plate.

[0032] Furthermore, the long-wave focusing lens is bonded to the long-wave focusing lens frame, and the bonding glue is low-temperature silicone rubber; threads are processed on the outer side of the long-wave focusing lens frame and are installed on the long-wave focusing lens bracket through a threaded pair; the long-wave focusing lens bracket is installed on the one-dimensional lifting platform through 4 screws; the long-wave focusing lens base is installed on the lower plate through 4 screws; the material of the long-wave focusing lens is single crystal germanium, and the surface is coated with an anti-reflection film that transmits the long-wave spectrum; the long-wave focusing lens frame, the long-wave focusing lens bracket, and the long-wave focusing lens base are all made of aluminum alloy, and the surface is black anodized; the one-dimensional lifting platform drives the long-wave focusing lens to move along the central axis direction, with a stroke of ±6mm.

[0033] Furthermore, the substrate is made of aluminum alloy and is integrally formed by 3D printing, with a base frequency greater than 600 Hz; the medium-wave spectrum is 3.7um to 4.8um, and the long-wave spectrum is 8um to 12.5um.

[0034] The advantages of the present invention compared with the prior art are:

[0035] 1. Compared with similar infrared multi-spectral cameras, this camera adopts a non-thermal control design, without thermal control instruments, heating equipment, radiation heat dissipation equipment and other supporting equipment. The camera power consumption requirement is less than 70w, which is 20w~30w lower than the current power consumption of similar equipment; the total weight of the camera is 13kg, which is 4kg lighter than similar equipment; the volume is 310mm×310mm×150mm, which can be adapted to the stratospheric aerostat pod with a diameter of 350mm and the aircraft-borne optoelectronic pod;

[0036] 2. Compared with the same type of infrared multi-spectral cameras, all components of the present invention are installed on the same substrate, and the processing, installation and testing standards are unified, which is conducive to ensuring the strict positional relationship of each important optical element of the camera, improving the image quality of the camera, and reducing the difficulty of camera installation and adjustment;

[0037] 3. The base plate adopts a double-layer duplex structure. The upper plate, lower plate and vertical plate can all provide installation interfaces. The color separation plate assembly, medium-wave front lens assembly and long-wave lens assembly are hoisted on the upper plate. The medium-wave detector refrigerator assembly and long-wave detector refrigerator assembly are installed on the middle wall of the base plate. Other equipment is installed on the lower plate, which solves the difficulty of insufficient installation space caused by the minimum gap of 5mm between adjacent optical parts and is conducive to the compact, lightweight and miniaturized design of the camera; the vertical plate has a shielding effect on light, reduces the background noise caused by stray light, and helps to improve the system signal-to-noise ratio;

[0038] 4. The substrate structure is one-piece, suitable for the development of 3D laser printing technology, with a short development cycle; the wall panel in the middle of the substrate divides the substrate into different cabins, increasing the overall rigidity, while also having the function of shading and preventing excess objects from entering the optical path; the one-piece configuration is conducive to heat conduction, the optical and mechanical temperature is uniform, and the thermal stress has little effect on the surface shape of the optical parts, which is conducive to improving image quality;

[0039] 5. The color separation sheet, lens, filter and structural frame are bonded with low-temperature silicone rubber, which can adapt to temperature changes of -55℃ to +60℃ without affecting the optical performance of the lens;

[0040] 6. The filter wheel spectroscopic technology is adopted to realize infrared ten-band subdivision imaging, with the spectral range of 3.7um~4.8um and 8um~12.5um; the medium-wave filter wheel and long-wave filter wheel work independently, and the corresponding filter can be cut into the optical path according to the needs to obtain the image information of different spectral bands of the target, with flexible working mode; the motors of the medium-wave filter wheel assembly and the long-wave filter wheel assembly are mature motor products, which can adapt to the working environment of -55℃~+60℃ and have high reliability;

[0041] 7. The medium wave channel and long wave channel of the camera can independently image and can also image the same target at the same time; the medium wave detector and long wave detector have the same specifications, with a pixel size of 640×512 and a pixel size of 25um, which is convenient for medium wave and long wave image fusion processing and improves the accuracy of target recognition;

[0042] 8. After testing, the temperature resolution of the medium-wave infrared channel is 18mk, and the temperature resolution of the long-wave channel is 59.8mk. The indicators are better than the temperature resolution of on-orbit satellite infrared cameras (30mk, 100mk), reaching the domestic leading level. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0044] Figure 1 This is a schematic diagram of the overall configuration of the camera of the present invention;

[0045] Figure 2 This is the optical path diagram of the camera of the present invention;

[0046] Figure 3 It is a configuration diagram of the base 1 of the present invention;

[0047] Figure 4 This is a structural diagram of the color separation sheet assembly 2 of the present invention;

[0048] Figure 5 This is a structural diagram of the wavefront lens group 3-1 in the present invention;

[0049] Figure 6 This is a structural diagram of the folding mirror 3-2 in the present invention;

[0050] Figure 7 It is a structural diagram of the medium wave focusing lens assembly 3-3 of the present invention;

[0051] Figure 8 This is a structural diagram of the medium wave rear lens group 3-4 of the present invention;

[0052] Fig. 9 It is a structural diagram of the medium wave filter wheel assembly 3-5 of the present invention;

[0053] Fig.10 This is a structural diagram of the medium wave detector refrigerator 3-6 of the present invention;

[0054] Fig.11 This is a structural diagram of the long-wave focusing lens assembly 4-1 of the present invention;

[0055] Fig.12 This is a structural diagram of the long wave fold mirror assembly 4-2 of the present invention;

[0056] Fig.13 This is a structural diagram of the long-wave lens assembly 4-3 of the present invention;

[0057] Fig.14 This is a structural diagram of the long-wave detector refrigerator assembly 4-5 of the present invention. DETAILED DESCRIPTION

[0058] In order to better understand the above technical scheme, the technical scheme of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical scheme of the present invention, rather than limitations on the technical scheme of the present invention. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0059] In the solution provided in the embodiment of the present invention, Figure 1 , Figure 2 As shown, the present invention includes a substrate 1, a color separation film assembly 2, a medium wave channel 3, and a long wave channel 4; in accordance with the order in which light enters, the components included in the medium wave channel 3 are, in sequence, a medium wave front lens group 3-1, a medium wave folding mirror 3-2, a medium wave focusing lens assembly 3-3, a medium wave rear path group 3-4, a medium wave filter wheel assembly 3-5, and a medium wave detector refrigerator assembly 3-6; in accordance with the order in which light enters, the components included in the long wave channel 4 are, in sequence, a long wave focusing lens assembly 4-1, a long wave folding mirror assembly 4-2, a long wave lens assembly 4-3, a long wave filter wheel assembly 4-4, and a long wave detector refrigerator assembly 4-5; all components of the color separation film assembly 2, the medium wave channel 3, and the long wave channel 4 are mounted on the substrate 1.

[0060] The optical path of the present invention is as follows Figure 2 As shown, the external light is split by the color separation plate assembly 2, reflecting the medium-wave spectrum and transmitting the long-wave spectrum; the reflected medium-wave spectrum light enters the medium-wave front lens assembly 3-1, the medium-wave folding mirror assembly 3-2, the medium-wave focusing lens assembly 3-3, the medium-wave rear lens assembly 3-4, and the medium-wave filter wheel assembly 3-5 in sequence, and finally reaches the medium-wave detector refrigerator assembly 3-6; the transmitted long-wave spectrum light enters the long-wave focusing lens assembly 4-1, the long-wave folding mirror assembly 4-2, the long-wave lens assembly 4-3, and the long-wave filter wheel assembly 4-4 in sequence, and finally reaches the long-wave detector refrigerator assembly 4-5.

[0061] like Figure 3 As shown, the substrate is a double-layer composite configuration. The upper plate 1-1, the lower plate 1-2, and the vertical plate 1-3 can all provide installation interfaces. The vertical plate has a reinforced structure and a light shielding function. The substrate is recommended to be made of aluminum alloy material 3D printing technology, one-piece molding, high rigidity, good thermal conductivity, can ensure the stability of the camera structure and uniform temperature; the surface of the substrate is black anodized to eliminate stray light.

[0062] like Figure 4 As shown, the color separation film assembly 2 includes a color separation film 2-1, a color separation film bracket 2-2, and an adhesive spot 2-3; the color separation film is a circular plane lens with a diameter of 55mm and a thickness of 3mm, which is bonded to the annular cavity of the color separation film bracket 2-2, and the adhesive is low-temperature silicone rubber; the adhesive is injected through the small hole on the side of the color separation film bracket 2-2 to form a circular adhesive spot in the gap between the two, the adhesive spot is 0.3mm thick and 3mm in diameter, and there are eight of them, which are distributed in a circle on the outer side of the color separation film 2-1; the light incident surface of the color separation film 2-1 is coated with a special film layer, which can reflect the medium-wave spectrum and transmit the long-wave spectrum, and the exit surface is coated with an anti-reflection film; the material of the color separation film 2-1 is zinc tin, and the material of the color separation film bracket 2-2 is aluminum alloy, and the low-temperature silicone rubber is used to bond the lens and the bracket, and can compensate for the mismatch of thermal expansion and contraction between the two.

[0063] like Figure 5 As shown, the medium wave front lens group 3-1 includes lens 3-1-1 and lens 3-1-2. The two lenses are bonded in the cavity of the lens barrel 3-1-3, and the lens surface is close to the step in the lens barrel; low-temperature silicone rubber is injected through the small hole in the wall of the lens barrel to bond the lens to the lens barrel; the outer side of the lens barrel 3-1-3 is processed with an external thread, and the inner thread is processed in the annular cavity of the bracket 3-1-4. The two are fastened together by a threaded pair, and anti-loosening glue is applied at the interface; the material of the lens 3-1-1 and lens 3-1-2 is single crystal silicon, and the lens barrel 3-1-2 and bracket 3-1-4 are made of aluminum alloy; the bracket 3-1-4 is hoisted on the upper plate of the substrate 1 by 4 screws; the surface of the lens 3-1-1 and lens 3-1-2 is coated with an anti-reflection film that transmits the medium wave spectrum; the surface of the lens barrel 3-1-2 and bracket 3-1-4 is black anodized.

[0064] like Figure 6 As shown, the medium wave refraction mirror 3-2 is a reflector, and the mirror body and the bracket are designed as an integrated whole. The material is aluminum alloy material for space reflectors, the reflecting surface is plated with aluminum film, and the surface of other parts is black anodized; the reflector bracket is fixed to the lower plate of the substrate 1 by 3 screws, and a 0.5mm unloading groove is cut near the screw hole.

[0065] like Figure 7As shown, the medium wave focusing lens assembly 3-3 includes a spherical lens 3-3-1, a lens frame 3-3-2, a bracket 3-3-3, a focusing mechanism 3-3-4, and a focusing mechanism mounting seat 3-3-5; the lens 3-3-1 is bonded to the lens frame 3-3-2, and the bonding glue is low-temperature silicone rubber; the outer side of the lens frame 3-3-2 is processed with an external thread, and the inner side of the annular cavity of the bracket 3-3-3 is processed with an internal thread, and the two are fixed by a thread pair; the focusing mechanism 3-3-4 is a commercial micro-one-dimensional lift The focusing mechanism 3-3-4 is fixed to the mounting seat 3-3-5 by 4 screws. The lens 3-3-1 is made of single crystal silicon, and its surface is coated with an anti-reflection film that transmits the medium-wave spectrum. The lens frame 3-3-2, the bracket 3-3-3, and the focusing mechanism mounting seat 3-3-5 are all made of aluminum alloy, and their surfaces are black anodized. The focusing mechanism 3-3-4 is a commercially mature miniature one-dimensional lifting platform, which is used for the one-dimensional movement of the lens 3-3-1 along the central axis, and the movement range is ±6mm.

[0066] like Figure 8 As shown, the medium-wave rear lens group 3-4 includes a rear lens 3-4-1, a rear lens 3-4-2, a rear lens 3-4-3, a lens barrel 3-4-4, and a support 3-4-5; the three lenses are bonded to the lens barrel 3-4-4 by low-temperature silicone rubber; the lens assembly sequence is as follows: place the rear lens 3-4-3 on the bottom surface of the lens barrel, inject adhesive through the small holes at the corresponding positions of the side wall of the lens barrel, and cure for 3 days; then assemble the rear lens 3-4-2 and the rear lens 3-4-3 in sequence; the outer side of the lens barrel 3-4-4 is processed with an external thread, and the inner side of the annular cavity of the support 3-4-5 is processed with an internal thread, and the two are fastened by a threaded pair; the lenses are all spherical lenses, made of single crystal silicon, and coated with an anti-reflection film that transmits the medium-wave spectrum; the lens barrel 3-4-4 and the support 3-4-5 are made of aluminum alloy, and the surface is black anodized; the support 3-4-5 is installed on the lower plate of the substrate 1 by 4 screws.

[0067] like Fig. 9As shown, the medium wave filter wheel assembly 3-5 includes a filter 3-5-1, a filter frame 3-5-2, a turntable 3-5-3, a motor 3-5-4, a gear pair 3-5-5, a bearing 3-5-6, and a mounting seat 3-5-7; the filter 3-5-1 is bonded to the filter frame 3-5-2, and the bonding glue is low-temperature silicone rubber; the filter frame is fixed to the turntable 3-5-3 by 3 screws; the gear pair 3-5-5 is mounted on the mounting seat by the bearing 3-5-6 3-5-7; motor 3-5-4 drives turntable 3-5-3 to rotate through gear pair 3-5-5; filter 3-5-1 is made of single crystal germanium, with a total of 5 pieces, each filter has a different film layer, used to transmit light of different spectrum bands; filter frame 3-5-2, turntable 3-5-3, and mounting seat 3-5-7 are made of aluminum alloy, with black anodized surface to eliminate stray light; gear pair 3-5-5 is made of aluminum alloy, with molybdenum disulfide coated on the surface to prevent cold welding. The configuration of long-wave filter wheel assembly 4-4 is exactly the same as that of medium-wave filter wheel assembly 3-5, the filter substrate material is single crystal germanium, and each filter is coated with different anti-reflection films to transmit different long-wave spectrum bands.

[0068] like Fig.10 As shown, the medium wave detector refrigerator assembly 3-6 includes a dewar 3-6-1, a refrigerator 3-6-2, and a bracket 3-6-3; the refrigerator is a small Stirling refrigerator, the effective pixel scale of the medium wave detector in the dewar is 640×512, the pixel size is 25um, the NETD≤15mk@300k, and the focal plane operating temperature is 80K±3K; the bracket 3-6-3 is made of aluminum alloy material, and the surface is black anodized; the copper tube between the dewar and the refrigerator is 3mm in diameter and about 300mm in length, and its configuration is bent and formed according to the layout.

[0069] like Fig.11 As shown, the long-wave focusing lens assembly 4-1 includes a lens 4-1-1, a lens frame 4-1-2, a bracket 4-1-3, a micro one-dimensional lifting platform 4-1-4, and a base 4-1-5; the lens is a spherical mirror, bonded to the lens frame 4-1-2, and the bonding glue is low-temperature silicone rubber; the outer side of the lens frame 4-1-2 is processed with an external thread, and the inner side of the annular cavity of the bracket 4-1-3 is internally threaded, and the two are fastened by a threaded pair; the bracket 4-1-3 is installed on the micro one-dimensional lifting platform by 4 screws Platform 4-1-4, lifting platform 4-1-4 is a mature commercial product, installed on base 4-1-5; base 4-1-5 is installed on the lower plate of substrate 1 by 4 screws; lens material is single crystal germanium, and the surface is coated with anti-reflection film that transmits long-wave spectrum; lens frame 4-1-2, bracket 4-1-3, base 4-1-5 are all made of aluminum alloy, and the surface is black anodized; one-dimensional lifting platform 4-1-4 drives lens 4-1-1 to move along the central axis direction, and the stroke is ±6mm.

[0070] like Fig.12As shown, the long-wave folding mirror assembly 4-2 includes a folding mirror 4-2-1 and a bracket 4-2-2; there are 2 folding mirrors, which are used to fold the light path and are made of aluminum alloy. Each folding mirror is installed on the bracket 4-2-2 by 3 screws; the normals of the two folding mirrors are perpendicular, and the light path is parallel to the original light path after folding; the bracket 4-2-2 is installed on the lower plate of the substrate 1 by 4 screws; the surface of the folding mirror 4-2-1 is coated with an aluminum reflective film, and the surface of the folding mirror bracket 4-2-2 is black anodized.

[0071] like Fig.13 As shown, the long-wave lens assembly 4-3 includes three spherical lenses, a long-wave lens 4-3-1, a lens 4-3-2, a lens 4-3-3, an inner lens barrel 4-3-4, an outer lens barrel 4-3-5, and a base 4-3-6; the long-wave lens 4-3-1 is bonded to the inner side of the inner lens barrel 4-3-4, and the bonding glue is low-temperature silicone rubber; the assembly sequence of the lens 4-3-2, the lens 4-3-3 and the outer lens barrel 4-3-5 is as follows: place the small plane of the lens 4-3-2 on the bottom surface of the outer lens barrel 4-3-5, and inject the bonding glue through the small hole in the barrel wall. The curing time is 3 days. The lens 4-3-3 is assembled in the same way; the inner lens barrel 4-3-4 has a flange in the middle, with external threads on both sides, the left external thread is screwed to the outer lens barrel 4-3-5, and the right external thread is screwed to the base; the base 4-3-6 is installed on the lower plate of the substrate 1 by 4 screws; the materials of lens 4-3-1, lens 4-3-2 and lens 4-3-3 are all single crystal germanium, and the surface is coated with an anti-reflection film that transmits the long-wave spectrum; the lens barrel 4-3-4, lens barrel 4-3-5 and base 4-3-6 are all made of aluminum alloy, and the surface is black anodized.

[0072] like Fig.14 As shown, the long-wave detector refrigerator assembly 4-5 includes a Dewar assembly 4-5-1 and a refrigerator assembly 4-5-2, and the refrigerator is a small Stirling refrigerator. The effective pixel size of the long-wave detector is 640×512, the pixel size is 25um, the NETD≤35mk@300K, and the focal plane operating temperature is 60K±3K; the refrigerator controller 4-5-3 is a dedicated controller for the refrigerator; the bracket 4-5-4 is made of aluminum alloy, and the surface is black anodized; the long-wave detector refrigerator assembly 4-5 is a mature commercial product.

[0073] Working principle of the present invention:

[0074] The incident light is split at the color separator, the middle infrared spectrum is reflected into the medium wave channel, and the long wave infrared spectrum is transmitted into the long wave infrared channel. The split medium wave infrared spectrum is converged by the lens, reflected by the folding mirror, and subdivided by the filter before entering the medium wave infrared detector. The optical signal is converted into an electrical signal, which is then processed by the camera electronics and outputs the medium wave infrared image. Similarly, the long wave infrared spectrum is converged by the lens, reflected by the folding mirror, and subdivided by the filter before entering the long wave infrared detector. Finally, it is processed by the electronics and outputs the long wave infrared image. The folding mirror is used to fold the light path and reduce the size of the camera. The filter wheel assembly is used to subdivide the spectrum. The medium wave / long wave filter wheel subdivides the spectrum into five sub-spectral bands, so the camera has the imaging capability of ten spectral bands.

[0075] All subassemblies of the camera are installed on the base plate and have the same assembly and testing standards. The double-layer composite configuration of the base plate ensures that the whole machine has high structural rigidity (base frequency is greater than 600HZ). The base plate material is made of aluminum alloy with good thermal conductivity, and is integrated using 3D printing technology to ensure the uniformity of camera temperature. The linear expansion coefficients of the camera optical material, optical bracket, and base plate material are matched. The optical parts and the supporting structure are bonded by low-temperature silicone rubber. The rubber can compensate for the stress caused by thermal expansion and contraction between the optical parts and the metal structure, realizing the athermal design of the camera, ensuring high-resolution imaging in the temperature range of -55℃ to +60℃ without thermal control equipment, and the actual measured temperature resolution in the long-wave spectrum is 59.8mk.

[0076] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0077] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A lightweight, small-sized, athermal infrared high-sensitivity camera structure, characterized in that: include: The base plate (1) of the double-layer frame is a load-bearing structure of the camera and is used to install the color separation filter assembly (2), the medium wave channel (3) and the long wave channel (4), and comprises an upper plate (1-1) and a lower plate (1-2); the upper plate (1-1) is used to install the electronic equipment of the camera, and the lower plate (1-2) is provided with a light inlet; the color separation filter assembly (2) is hoisted on the upper plate (1-1); A color separation sheet component (2) having a coating layer on its surface, used for splitting the medium-wave and long-wave spectrums of incident light, reflecting the medium-wave spectrum light into the medium-wave channel (3), and transmitting the long-wave spectrum light into the long-wave channel (4); The medium wave channel (3) is installed on the substrate (1), receives incident light of the medium wave spectrum band reflected by the color separation film assembly (2), and subdivides the spectrum band into five sub-spectral bands through the medium wave filter wheel (3-5), thereby realizing medium wave five-spectral band imaging; The long-wave channel (4) is installed on the substrate (1), receives incident light of the long-wave spectrum band transmitted by the color separation film assembly (2), and subdivides the spectrum band into five sub-spectral bands through the long-wave filter wheel (4-4), thereby realizing long-wave five-spectral band imaging.

2. A light and small athermal infrared high-sensitivity camera structure according to claim 1, characterized in that: The substrate (1) also includes vertical plates (1-3); the vertical plates (1-3) isolate the double-layer frame structure of the substrate (1) into different areas, so as to strengthen the rigidity of the double-layer frame structure and shield external stray light.

3. A light and small athermal infrared high-sensitivity camera structure according to claim 1, characterized in that: The lower surface of the lower plate (1-2) is the reference surface of the camera. The assembly, adjustment and testing of the camera optical parts are all based on the lower surface of the lower plate (1-2). The mechanical processing of the substrate (1) is based on the lower surface of the lower plate (1-2).

4. The light and small athermal infrared high-sensitivity camera structure according to claim 1, characterized in that: The color separation film assembly (2) comprises a color separation film (2-1), a color separation film bracket (2-2), and an adhesive patch (2-3); the color separation film (2-1) is fixedly connected to the color separation film bracket (2-2), and a circular adhesive patch (2-3) is injected into the gap between the two through a small hole on the side of the color separation film bracket (2-2); the adhesive patch (2-3) has a thickness of 0.3 mm and a diameter of 3 mm, and there are eight of them in total, which are distributed on the outer side of the color separation film (2-1) in a circle; the light incident surface coating layer of the color separation film (2-1) is used to reflect the medium-wave spectrum and transmit the long-wave spectrum, and the light exit surface of the color separation film (2-1) is coated with an anti-reflection film.

5. The light and small athermal infrared high-sensitivity camera structure according to claim 4, characterized in that: The color separation sheet (2-1) is a circular plane lens with a diameter of 55 mm and a thickness of 3 mm. The color separation sheet (2-1) is made of zinc tin, and the color separation sheet bracket (2-2) is made of aluminum alloy. The color separation sheet is bonded to the color separation sheet bracket (2-2), and the bonding glue is low-temperature silicone rubber, which is used to compensate for the mismatch between thermal expansion and contraction of the two.

6. The light and small athermal infrared high-sensitivity camera structure according to claim 1, characterized in that: The medium wave channel (3) comprises a medium wave front lens group (3-1), a medium wave folding mirror (3-2), a medium wave focusing lens group (3-3), a medium wave rear lens group (3-4), a medium wave filter wheel assembly (3-5), and a medium wave detector refrigerator assembly (3-6); The medium wave front lens group (3-1) comprises a medium wave front lens barrel (3-1-3), a medium wave front lens bracket (3-1-4), a first medium wave front lens (3-1-1) and a second medium wave front lens (3-1-2); the two medium wave front lenses are fixedly connected in the medium wave front lens barrel (3-1-3); the medium wave front lens barrel (3-1-3) is mounted on the medium wave front lens bracket (3-1-4); the medium wave front lens bracket (3-1-4) is hoisted on the upper plate (1-1); the surfaces of the first medium wave front lens (3-1-1) and the second medium wave front lens (3-1-2) are plated with anti-reflection films that transmit the medium wave spectrum; the surfaces of the medium wave front lens barrel (3-1-3) and the medium wave front lens bracket (3-1-4) are black anodized; the medium wave front lens group (3-1) is hoisted and mounted on the upper plate (1-1); The middle fold mirror (3-2) is a reflector, and its mirror body and bracket are an integrated structure. The material is aluminum alloy material used for space reflectors, the reflective surface is plated with aluminum film, and the surface of other parts is black anodized. The bracket of the reflector is fixed to the lower plate (1-2) by 3 screws, and the screw holes are cut with 0.5mm unloading grooves. The medium wave focusing lens assembly 3-3 comprises a medium wave focusing spherical lens (3-3-1), a medium wave focusing lens frame (3-3-2), a medium wave focusing lens bracket (3-3-3), a focusing mechanism (3-3-4), and a focusing mechanism mounting seat (3-3-5); the medium wave focusing spherical lens (3-3-1) is bonded to the medium wave focusing lens frame (3-3-2), and the bonding glue is low temperature silicone rubber; the outer side of the medium wave focusing lens frame (3-3-2) is processed with threads and is fixed to the medium wave focusing lens bracket (3-3-3) through a thread pair; the focusing mechanism (3-3-4) is bonded to the medium wave focusing lens frame (3-3-2) and the ...) is provided with a focusing mechanism (3-3-5); the focusing mechanism (3-3-5) is bonded to the medium wave focusing lens frame (3-3-2) and the focusing mechanism mounting seat (3-3-5) is provided with a focusing mechanism (3-3-5); the focusing mechanism (3-3-1) is bonded to the medium wave focusing lens frame (3-3-2) and the focusing mechanism mounting seat (3-3-5) is provided with a focusing mechanism (3-3-5); the focusing mechanism (3-3-1) is bonded to the medium wave focusing lens frame (3-3-2) and the focusing mechanism mounting seat (3-3-5) is provided with a focusing mechanism (3-3-5); the focusing mechanism (3-3-1) is 3-4) is fixed to the focusing mechanism mounting seat (3-3-5) by 4 screws; the medium wave focusing spherical lens (3-3-1) is made of single crystal silicon, and the surface is coated with an anti-reflection film that transmits the medium wave spectrum; the medium wave focusing lens frame (3-3-2), the medium wave focusing lens bracket (3-3-3), and the focusing mechanism mounting seat (3-3-5) are all made of aluminum alloy, and the surface is black anodized; the focusing mechanism (3-3-4) is a one-dimensional lifting platform, which is used for the medium wave focusing spherical lens (3-3-1) to move one dimensionally along the central axis direction, and the movement range is ±6mm; The medium wave rear lens group (3-4) includes a first medium wave rear lens (3-4-1), a second medium wave rear lens (3-4-2), a third medium wave rear lens (3-4-3), a medium wave rear lens barrel (3-4-4), and a medium wave rear lens support (3-4-5); the first medium wave rear lens (3-4-1), the second medium wave rear lens (3-4-2), and the third medium wave rear lens (3-4-3) are bonded to corresponding positions of the inner cavity of the medium wave rear lens barrel (3-4-4), and the bonding glue is low The medium wave rear lens barrel (3-4-4) is threaded on the outside and is installed on the medium wave rear lens support (3-4-5) through a thread pair; the three medium wave rear lenses are all spherical mirrors, made of single crystal silicon, and coated with an anti-reflection film that transmits the medium wave spectrum; the medium wave rear lens barrel (3-4-4) and the medium wave rear lens support (3-4-5) are made of aluminum alloy, and the surface is black anodized; the medium wave rear lens support (3-4-5) is installed on the lower plate (1-2) through 4 screws; The medium wave filter wheel assembly (3-5) comprises a filter (3-5-1), a filter frame (3-5-2), a turntable (3-5-3), a motor (3-5-4), a gear pair (3-5-5), a bearing (3-5-6), and a medium wave filter wheel mounting seat (3-5-7); the filter (3-5-1) is bonded to the filter frame (3-5-2), and the bonding glue is low temperature silicone rubber; the filter frame (3-5-2) is fixed by three screws. The rotating disk (3-5-3) is fixed on the rotating disk (3-5-3); the gear pair (3-5-5) is installed on the medium wave filter wheel mounting seat (3-5-7) through the bearing (3-5-6); the motor (3-5-4) drives the rotating disk (3-5-3) to rotate through the gear pair (3-5-5); the filter (3-5-1) is made of single crystal germanium, with a total of 5 pieces, which are installed on the rotating disk (3-5-3), and the film layers of each filter are different from each other, and are used to transmit light of different spectral bands; The medium wave detector refrigerator assembly (3-6) includes a dewar (3-6-1), a refrigerator (3-6-2), and a medium wave detector refrigerator bracket (3-6-3); the medium wave detector refrigerator bracket (3-6-3) is made of aluminum alloy material, and the surface is black anodized; the dewar (3-6-1) and the refrigerator (3-6-2) are installed on the bracket (3-6-3), and the bracket is installed on the lower plate (1-2) of the substrate; A medium wave folding mirror (3-2), a medium wave focusing lens group (3-3), a medium wave rear lens group (3-4), and a medium wave filter wheel assembly (3-5) are installed on the lower plate (1-2).

7. A light and small athermal infrared high-sensitivity camera structure according to claim 6, characterized in that: The two medium wave front lenses are bonded in a medium wave front lens barrel (3-1-3), and the bonding glue is low-temperature silicone rubber; threads are processed on the outer side of the medium wave front lens barrel (3-1-3), and the medium wave front lens bracket (3-1-4) is installed on the medium wave front lens bracket (3-1-4) through a thread pair; the first medium wave front lens (3-1-1) and the second medium wave front lens (3-1-2) are made of single crystal silicon, and the medium wave front lens barrel (3-1-3) and the medium wave front lens bracket (3-1-4) are made of aluminum alloy; the medium wave front lens bracket (3-1-4) is hoisted on the upper plate (1-1) through four screws.

8. The light and small athermal infrared high-sensitivity camera structure according to claim 1, characterized in that: The long-wave channel (4) comprises a long-wave focusing lens assembly (4-1), a long-wave folding mirror assembly (4-2), a long-wave lens assembly (4-3), a long-wave filter wheel assembly (4-4), and a long-wave detector refrigerator assembly (4-5); The long-wave focusing lens assembly (4-1) comprises a long-wave focusing lens (4-1-1), a long-wave focusing lens frame (4-1-2), a long-wave focusing lens bracket (4-1-3), a one-dimensional lifting platform (4-1-4), and a long-wave focusing lens base (4-1-5); the long-wave focusing lens (4-1-1) is a spherical mirror, fixedly connected in the long-wave focusing lens frame (4-1-2), and the bonding glue is low-temperature silicone rubber; the long-wave focusing lens frame (4-1-2) is installed on the long-wave focusing lens bracket (4-1-3); the long-wave focusing lens bracket (4-1-3) is installed on the one-dimensional lifting platform (4-1-4); the lifting platform (4-1-4) is installed on the long-wave focusing lens base (4-1-5); the long-wave focusing lens base (4-1-5) is installed on the lower plate (1-2); the surface of the long-wave focusing lens (4-1-1) is coated with an anti-reflection film that transmits the long-wave spectrum; The long-wave fold mirror assembly (4-2) comprises a long-wave fold mirror (4-2-1) and a long-wave fold mirror bracket (4-2-2); the number of the long-wave fold mirrors (4-2-1) is 2, which are used to fold the light path and are installed on the long-wave fold mirror bracket (4-2-2) by means of 3 screws; the long-wave fold mirror bracket (4-2-2) is installed on the lower plate (1-2) by means of 4 screws; the surface of the long-wave fold mirror (4-2-1) is coated with an aluminum reflective film, and the surface of the long-wave fold mirror bracket (4-2-2) is black anodized; The long-wave lens assembly (4-3) comprises a first long-wave lens (4-3-1), a second long-wave lens (4-3-2), a third long-wave lens (4-3-3), an inner lens barrel (4-3-4), an outer lens barrel (4-3-5), and a long-wave lens base (4-3-6); the first long-wave lens (4-3-1) is bonded to the inner side of the inner lens barrel (4-3-4), and the bonding glue is low-temperature silicone rubber; the second long-wave lens (4-3-2) and the third long-wave lens (4-3-3) are bonded to the inner side of the outer lens barrel (4-3-5), and the bonding glue is low-temperature silicone rubber; the openings at both ends of the inner lens barrel (4-3-4) are different in size, and the side with the larger opening is processed with an internal thread, and the side with the larger opening of the outer lens barrel (4-3-5) is processed with an external thread matching therewith, and the two are connected. The outer lens barrel (4-3-5) is fixed by a threaded pair; an outer thread is processed on the outer side of the middle part, which cooperates with the inner thread of the long-wave lens base (4-3-6) and is fixed to the long-wave lens base (4-3-6) by a threaded pair; the long-wave lens base (4-3-6) is installed on the lower plate (1-2) by four screws; the first long-wave lens (4-3-1), the second long-wave lens (4-3-2) and the third long-wave lens (4-3-3) are all made of single crystal germanium, and the surface is coated with an anti-reflection film that transmits the long-wave spectrum; the inner lens barrel (4-3-4), the outer lens barrel (4-3-5) and the long-wave lens base (4-3-6) are all made of aluminum alloy, and the surface is black anodized; the long-wave lens assembly (4-3) is hoisted and installed on the upper plate (1-1); The structures of the long-wave filter wheel assembly (4-4) and the medium-wave filter wheel assembly (3-5) are the same except that the surface film layer of the five filters is an anti-reflection film for anti-reflection of the long-wave spectrum band; the long-wave focusing lens assembly (4-1), the long-wave folding mirror assembly (4-2), and the long-wave filter wheel assembly (4-4) are installed on the lower plate (1-2); The long-wave detector refrigerator assembly (4-5) comprises a Dewar assembly (4-5-1) and a refrigerator assembly (4-5-2), both of which are independently mounted on a vertical plate (1-3) of a base plate (1).

9. The light and small athermal infrared high-sensitivity camera structure according to claim 8, characterized in that: The long-wave focusing lens (4-1-1) is bonded to the long-wave focusing lens frame (4-1-2), and the bonding glue is low-temperature silicone rubber; threads are processed on the outer side of the long-wave focusing lens frame (4-1-2), and the long-wave focusing lens frame (4-1-2) is installed on the long-wave focusing lens bracket (4-1-3) through a thread pair; the long-wave focusing lens bracket (4-1-3) is installed on the one-dimensional lifting platform (4-1-4) through four screws; the long-wave focusing lens base (4-1-5) is installed on the lower layer through four screws On the plate (1-2); the material of the long-wave focusing lens (4-1-1) is single crystal germanium, and the surface is coated with an anti-reflection film that transmits the long-wave spectrum; the long-wave focusing lens frame (4-1-2), the long-wave focusing lens bracket (4-1-3), and the long-wave focusing lens base (4-1-5) are all made of aluminum alloy materials, and the surface is black anodized; the one-dimensional lifting platform (4-1-4) drives the long-wave focusing lens (4-1-1) to move along the central axis direction, with a stroke of ±6mm.

10. The light and small athermal infrared high-sensitivity camera structure according to claim 1, characterized in that: The substrate (1) is made of aluminum alloy and is integrally formed by 3D printing, with a base frequency greater than 600 Hz; the medium-wave spectrum range is 3.7 um to 4.8 um, and the long-wave spectrum range is 8 um to 12.5 um.

Images