Lightweight high-stability space optical camera structure

Abstract

The invention relates to the technical field of space optical remote sensing, in particular to a light-weight high-stability space optical camera structure, and solves the problems that the light-weight design of a space optical camera causes insufficient rigidity of a camera structure, and weight increase and whole machine light weight are difficult to achieve simultaneously due to the use of an independent temperature control unit. The camera mainly comprises a light shield, a camera main body, an optical machine main body, a heat dissipation plate and an externally-pasted heat pipe. The M40J resin-based carbon fiber material adopted by the invention has the advantages of low density, relatively high damping characteristic and modulus and relatively good thermal stability. Through combined use of bearing structures such as resin-based carbon fibers and aluminum alloy plates, the weight of the whole machine can be obviously reduced, the mechanical stability of the optical camera is ensured, and the optical camera can be widely applied to space cameras with large view fields and high stray light requirements. The high temperature control precision of the optical camera can be realized by reasonably configuring the bearing structure, the thermal control assembly and the like, so that the dimensional stability of the optical-mechanical structure is improved, and the imaging quality stability of the optical camera is further ensured.

Description

Technical Field

[0001] The present invention relates to the field of space optical remote sensing technology, and in particular to a lightweight and highly stable space optical camera structure. Background Art

[0002] At present, space optical remote sensing technology is developing rapidly and has been widely used in earth radiation measurement, atmospheric observation and space environment detection. The requirements for optical camera's width, resolution and optical axis stability are getting higher and higher. At the same time, optical cameras are also developing towards lightweight, high integration and high stability.

[0003] Off-axis reflective optical cameras have a large field of view and high imaging quality, which can greatly improve the technical indicators of optical cameras. However, since a large field of view often requires a large-sized sunshade with an opening angle, it brings challenges to the rigidity and strength design of the sunshade. In addition, the stray light outside the field of view introduced by the large field of view will reduce the transfer function and affect the imaging quality. At the same time, the off-axis reflective optical system is large in size and complex to install and adjust, but the weight and size resources of the satellite payload platform are limited.

[0004] In addition, the thermal environment of space optical cameras in orbit is harsh. The temperature gradient caused by the huge temperature difference can cause the camera structure to shift, affecting the position and surface shape of optical components and reducing the imaging quality of the optical camera. Summary of the invention

[0005] It is necessary to further design the optical camera structure to be lightweight and integrated while ensuring the mechanical stability requirements. The optical camera structure needs to be independently temperature-controlled to improve the thermal stability of the structure and ensure the performance of the optical camera. Generally, the heat dissipation surface resources of satellite platforms are limited. In independent temperature control, the optical camera structure needs to be designed with an independent heat dissipation surface. Therefore, the camera structure needs to be optimized to provide an effective heat dissipation path and ensure the mechanical stability of the optical camera structure, while not occupying the weight resources of the satellite platform.

[0006] In order to solve the problems existing in the prior art, the present invention provides a lightweight and highly stable space optical camera structure. The camera structure has the characteristics of easy installation and adjustment, high integration, light weight, and high mechanical and structural thermal stability, which effectively improves the on-orbit stability of the space optical camera, and at the same time saves resources such as installation size, heat dissipation surface and weight for the satellite payload platform.

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

[0008] A lightweight and highly stable space optical camera structure, the structure comprising: a light shield 1, a camera frame 2, and an optical machine body 3, the lightweight and highly stable space optical camera structure also comprising a heat sink 4 and an externally attached heat pipe 5 arranged on the -X surface of the heat sink 4; the -X surface of the light shield 1 is provided with a reinforcing rib 103, and an embedded part 102 is bonded on the reinforcing rib 103 to provide a mounting interface for the heat sink 4; the heat sink 4 serves as a load-bearing structure and is fixed to the -X surface of the camera frame 2 and the mounting interface of the light shield 1 at the same time, the light shield 1 is connected to the +Z surface of the camera frame 2, and the three are mutually constrained; the optical machine body 3 is provided with a scanning mechanism assembly 31, a detector assembly 36, a detector circuit box 37, and a high-voltage circuit box 38 and the optical machine main frame 39; the scanning mechanism assembly 31 includes an aluminum-based silicon carbide U-shaped frame 311 and a scanning mechanism L-shaped heat pipe 314; the evaporation section of the L-shaped heat pipe 314 is thermally connected to the aluminum-based silicon carbide U-shaped frame 311 through a flange, and the condensation section is thermally connected to the heat sink 4 through a flange, so as to form a heat dissipation channel of the scanning mechanism assembly 31; the detector assembly 36 is thermally insulated from the optical machine main frame 39, and the heat generated by the detector assembly 36 can be thermally conducted to the heat sink 4 through the MCP bracket 362, the L-shaped heat sink 364, and the detector L-shaped heat pipe 365; the detector circuit box 37 and the high-voltage circuit box 38 both transfer heat to the heat sink 4 through heat pipes or direct thermal connections.

[0009] The light shield is made of lightweight material M40J resin-based carbon fiber. The light shield adopts an inverted cone design for field of view constraint, has a larger field of view angle in the +Y direction, and can detect the edge by using the swing scanning function of the scanning mechanism.

[0010] The interior of the light shield is provided with a light blocking ring and sprayed with stray light eliminating black paint to suppress stray light in the field of view.

[0011] Preferably, the sunshade is designed with vertical reinforcement ribs in the X direction, the reinforcement ribs on the -X surface are lightweight and hollowed out and provide mounting interfaces for the heat sink, the reinforcement ribs and the light-blocking ring increase the lateral and vertical stiffness of the sunshade, and the side walls and the light-blocking ring of the sunshade are designed with variable thickness from the fixed end to the free end to enhance the stiffness strength of the sunshade.

[0012] Preferably, the side walls of the light shield and the light blocking ring are designed with variable thickness from the fixed end to the free end, so as to improve the structural stability of the light shield.

[0013] The camera frame includes a frame body, a bracket, a +Y plate, a -Y plate, a +X plate and a +Z plate. The frame body is an integrated hollow design, and six surfaces are provided with mounting interfaces.

[0014] The bracket is made of M40J resin-based carbon fiber lightweight material, with a structural optimization design to reduce weight and is formed by integral winding of layers. The bracket is installed in a heat-insulated manner with the satellite platform, which increases the height of the camera on the satellite platform and reduces the stray light from the higher reflective surface on the satellite platform entering the field of view.

[0015] The +Z surface of the bracket is provided with a titanium alloy embedded threaded hole, which is the installation interface of the outer frame body and the optical machine body. The optical machine body and the bracket are installed in a heat-insulated manner. The +Z plate of the camera outer frame provides a mounting surface for the light shield, and the -Y plate of the camera outer frame provides an external installation interface for power supply and communication for the camera.

[0016] The camera frame is used to provide a support envelope for the optical machine body and the lens hood.

[0017] The optical machine body adopts an off-axis three-mirror optical system.

[0018] The optical machine body comprises a scanning mechanism component, an off-axis three-mirror optical component, a detector component, an optical machine body frame, a detector component, a detector circuit box and a high-voltage circuit box.

[0019] The off-axis three-mirror optical assembly comprises a telescope, a slit, a collimator, a grating and other reflector assemblies.

[0020] The off-axis three-mirror optical components can be installed and adjusted on the outside of the main frame of the optical machine, and the inside of the main frame of the optical machine is sprayed with black paint to eliminate stray light. The reflectors are made of microcrystalline glass with high thermal stability, and the frames of the reflector components are made of titanium alloy with high thermal stability, ensuring that the reflectors have good surface indicators in the track thermal environment.

[0021] Preferably, the optical machine main frame is integrally formed and lightweight by means of a weight-reducing groove structure, and adopts 2A12 duralumin material with good thermal and mechanical properties. Its higher thermal conductivity reduces the temperature gradient of the structure, reduces the thermal deformation of the optical machine main frame, and ensures the imaging stability of the optical camera when working.

[0022] The scanning mechanism component has a one-dimensional swing scanning function and can detect the nadir and the limb along the Y direction.

[0023] The scanning mechanism assembly includes an aluminum-based silicon carbide U-shaped frame, a motor drive shaft system assembly, a scanning mirror assembly and an L-shaped heat pipe.

[0024] Preferably, the scanning mechanism assembly is thermally insulated from the main frame of the optical machine, and the two ends of the L-shaped heat pipe of the scanning mechanism are respectively connected to the U-shaped frame and the +X surface of the heat sink through flanges, so that the scanning mechanism has a good heat dissipation channel. The interior of the L-shaped heat pipe is a capillary porous structure filled with liquid, the side close to the scanning mechanism is the evaporation section, and the side close to the heat sink is the condensation section.

[0025] Preferably, the aluminum-based silicon carbide has a high thermal conductivity, so that the U-shaped frame has a good temperature gradient, reduces thermal deformation caused by temperature difference, reduces friction torque caused by thermal deformation, and ensures the driving torque margin of the scanning mechanism.

[0026] The detector assembly comprises an MCP assembly, an MCP bracket, a voltage divider assembly, an L-shaped heat sink, a detector L-shaped heat pipe and a heat collection plate.

[0027] Preferably, the detector assembly is thermally insulated from the main frame of the optical machine. The heat generated by the pressure divider assembly and the MCP assembly can be led to the heat dissipation plate through the MCP bracket, the L-shaped heat sink, the heat collection plate and the detector L-shaped heat pipe. This design enables the detector assembly to have an independent heat dissipation path, improves the temperature control accuracy of the detector assembly, and ensures the stability of the optical imaging of the detector assembly.

[0028] Preferably, the upper part of the heat sink +X surface is sprayed with s781 thermal control white paint to form a cold end, and two external heat pipes are arranged on the +X surface, which can not only improve the heat dissipation efficiency but also increase the rigidity of the heat sink and the external heat pipes.

[0029] Preferably, the -X surfaces of the detector circuit box and the high-voltage circuit box are thermally connected to the heat sink, and the +X surfaces of the detector circuit box and the high-voltage circuit box are thermally insulatedly connected to the optical machine body. The heat generated by the high-power electronic components and circuit boards is transferred to the -X surface of the circuit box cover through the circuit box thermal conductive sheet and the circuit box frame. This thermal conduction path can quickly transfer the heat to the cold end of the heat sink, ensuring that the circuit box has a stable operating temperature.

[0030] Preferably, the detector circuit box and the high-voltage circuit box serve as load-bearing structures to connect the optical machine body and the heat sink in the X direction, thereby increasing the rigidity of the optical camera in the X direction and improving the mechanical stability of the optical camera. The versatility of the circuit box improves the integration of the entire machine and saves weight resources.

[0031] Preferably, the optical machine main frame is installed in a heat-insulated manner together with the internal heat source component and the camera outer frame to avoid the influence of the internal heat source and the heat flow outside the space on the temperature of the optical machine main frame. The optical machine main frame is affixed with a heating sheet, and high-precision temperature control can be achieved by controlling the heating power, thereby reducing the thermal deformation of the optical machine structure and improving the dimensional stability of the camera.

[0032] Preferably, the heat sink is fixed to the -X surface of the camera frame and the mounting interface of the light shield, and the light shield is connected to the +Z surface of the camera frame. The three are mutually constrained to further improve the mechanical stability of the optical camera.

[0033] Beneficial effects of the present invention:

[0034] 1. The present invention adopts lightweight materials such as carbon fiber and aluminum alloy to significantly reduce the weight of the whole machine. At the same time, the camera structure is lightweight and mechanically resistant, thereby improving the mechanical stability of the camera structure.

[0035] 2. The carbon fiber sunshade of the present invention adopts an inverted cone design to ensure the camera field of view index requirements, so that the camera can have the functions of nadir and limb detection. At the same time, the sunshade and the bracket are used in combination to reduce the influence of stray light from other reflective surfaces on the satellite platform on the optical performance.

[0036] 3. The heat sink of the present invention is both a load-bearing structure of the camera and a heat sink component, and is mutually constrained with the external heat pipe and the light shield, which can not only improve the structural rigidity and strength of the three at the same time, but also ensure the effectiveness of the heat sink component in independent temperature control of the camera structure.

[0037] 4. The circuit box of the present invention is installed with heat insulation on the optical machine body on the +X surface, and heat conduction on the -X surface and the heat sink, which not only provides a good heat dissipation channel for the electronic device, but also greatly reduces the influence of external heat flow on the optical machine body. By combining with the heater, the temperature control accuracy of the optical camera structure can be guaranteed. At the same time, the circuit box also serves as a load-bearing structural member to connect the internal optical machine structure and the external heat sink, further improving the structural rigidity of the optical camera.

[0038] 5. The scanning structure component and the detector component of the present invention are both active components that can generate heat. The heat is dissipated to the heat sink through independent heat dissipation channels, and the heat is not introduced into the optical machine body. The temperature control accuracy of the optical machine body is guaranteed while effective heat dissipation is performed.

[0039] 6. The heat generated by the optical camera of the present invention is dissipated through the camera body, thereby reducing the heat dissipation burden of the entire satellite.

[0040] 7. The optical machine body of the present invention adopts a modular passive component design, which is convenient for optical assembly and various optical tests.

[0041] The present invention optimizes the design of the optical camera structure, increases the versatility of the structural parts, improves the integration of the camera structure, ensures the stability of the optical camera imaging quality while having mechanical stability and thermal stability, saves resources such as size, weight and heat dissipation for the satellite platform, and this type of structure can be widely used in various types of space optical cameras. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic diagram of a lightweight and highly stable space optical camera structure before assembly according to the present invention;

[0043] Figure 2 This is a schematic diagram of a lightweight and highly stable space optical camera structure after assembly according to the present invention;

[0044] Figure 3It is a schematic diagram of the sunshade of the present invention;

[0045] Figure 4 It is a schematic diagram of the camera frame structure of the present invention;

[0046] Figure 5 A schematic diagram of the optical path propagation of the off-axis three-mirror optical system of the present invention;

[0047] Figure 6 It is a schematic diagram of the optical machine body of the present invention;

[0048] Figure 7 It is a schematic diagram of the detector assembly of the present invention;

[0049] Figure 8 It is a schematic diagram of the scanning mechanism components of the present invention;

[0050] Fig. 9 It is a schematic diagram of the detector circuit box of the present invention;

[0051] Fig.10 It is a schematic diagram of the installation relationship of the heat sink of the present invention.

[0052] Reference numerals

[0053] 1-light shield 101-light shield mounting flange 102-titanium alloy embedded parts

[0054] 103—X-surface reinforcement 104-light blocking ring 105-+X-direction reinforcement

[0055] 106-side wall of lens hood 2-camera frame 21-bracket

[0056] 22-outer frame body 23-+Y plate 24—Y plate

[0057] 25-+z plate 26-+X plate 211-bracket installation interface

[0058] 212-Titanium alloy embedded parts 221-Heat sink installation interface 241-Power supply and communication interface

[0059] 3- Optical machine body 31- Scanning mechanism assembly 32- Telescope assembly

[0060] 33-slit 34-collimator assembly 35-grating assembly

[0061] 36-Detector assembly 37-Detector circuit box 38-High voltage circuit box

[0062] 39-optical machine main frame 311-aluminum-based silicon carbide U-shaped frame 312-scanning mirror assembly

[0063] 313-Motor drive shaft assembly 314-Scanning mechanism L-type heat pipe 361-MCP, 362-MCP bracket

[0064] 363-pressure dividing assembly 364-L-type heat sink 365-detector L-type heat pipe

[0065] 366-heat collection board 371-detector circuit box cover 372-detector circuit board

[0066] 373-Detector circuit box heat conducting sheet 374-Detector circuit box frame 375-High power power supply module

[0067] 376-Insulation pad 381-High voltage circuit box cover 391-Optical machine body installation interface

[0068] 4- heat sink 5- external heat pipe DETAILED DESCRIPTION

[0069] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0070] Figure 1 It is the assembled space optical camera structure. Figure 2 The lens hood 1, the heat sink 4 and the camera frame 2 are not assembled. Figure 2 As shown, the structure of the lightweight and highly stable space optical camera includes: a light shield 1, a camera frame 2, an optical machine body 3, a heat sink 4 and an external heat pipe 5.

[0071] Figure 3 In order to better illustrate the components and their relationships on the sunshade 1, the combination of two perspectives (a) and (b) is used for illustration. Part (a) is a schematic diagram of the sunshade 1 from a first perspective, and part (b) is a schematic diagram of the sunshade 1 from a second perspective. Figure 3 As shown, the sunshade 1 includes a sunshade mounting flange 101 , a first titanium alloy embedded part 102 , a -X-plane reinforcing rib 103 , a light-blocking ring 104 , a +X-direction reinforcing rib 105 and a sunshade side wall 106 .

[0072] The sunshade 1 is made of M40J resin-based carbon fiber material, which has a low density, good damping properties and stiffness, as well as low thermal conductivity and thermal expansion coefficient, which enables the sunshade 1 structure to occupy lower weight resources while having good mechanical stability and thermal stability.

[0073] The structural parts of the sunshade 1 are formed by winding the layers together and fixed by gluing.

[0074] The side wall 106 of the light shield adopts an inverted cone design to meet the detection field of view requirements of the optical camera. A larger light entrance angle is set in the +Y direction of the light shield 1 to meet the camera's detection of the edge of the earth. The scanning mechanism assembly 31 can perform push-scan detection along the -Y to +Y direction of the light shield 1.

[0075] Light-blocking rings 104 are arranged inside the sunshade 1. The arrangement of the light-blocking rings 104 along the light incident direction - Z direction gradually becomes denser. The light-blocking rings are all sprayed with stray light-eliminating black paint. The light-blocking ring structure and the stray light-eliminating black paint can effectively suppress stray light outside the field of view entering the sunshade.

[0076] The light shield 1 is provided with -X surface reinforcement ribs 103 , and the first titanium alloy embedded part 102 is bonded and fixed on the -X surface reinforcement ribs 103 to provide a mounting interface for the heat sink 4 , and the first titanium alloy embedded part 102 is threadedly connected to the heat sink 4 .

[0077] -X-plane reinforcement ribs 103, +X-direction reinforcement ribs 105 and light-blocking rings 104 provide lateral and longitudinal support for the side wall 106 of the light shield. The side wall 106 of the light shield adopts a variable thickness design along the +Z direction, and the thickness gradually decreases from the constrained end to the free end. The above technical solution reduces the weight of the light shield 1 by using lightweight materials and structural optimization design, improves the rigidity and strength of the light shield 1, and ensures the mechanical stability and thermal stability of the light shield 1.

[0078] like Figure 4 As shown, the camera frame 2 includes a bracket 21, a frame body 22, a +Y plate 23, a -Y plate 24, a +Z plate 25 and a +X plate 26.

[0079] The bracket 21 adopts M40J resin-based carbon fiber lightweight material with good mechanical and thermal properties. Furthermore, the bracket structure is optimized to design a weight reduction groove and is formed by layering and winding. The layering method is selected according to the mechanical properties. While the structure is lightweight, it ensures that it has good structural stability and improves the pointing accuracy of the optical camera.

[0080] The bracket mounting interface 211 fixes the camera on the satellite platform and is thermally insulated with the satellite platform. The bracket increases the height of the camera on the satellite platform and cooperates with the sunshade 1 to reduce the stray light scattered by the higher reflective surface on the satellite platform from entering the field of view.

[0081] A second titanium alloy embedded part 212 is provided on the +Z surface of the bracket 21 , which serves as an installation interface between the outer frame body 22 and the optical machine body 3 . Furthermore, the optical machine body 3 and the bracket 21 are installed in a heat-insulated manner.

[0082] The outer frame body 22 is an integrated hollow design, so that the camera outer frame 2 has good structural stability, and the six faces of the outer frame body 22 are provided with five mounting interfaces of the plate and the bracket 21. Furthermore, the -Z face of the outer frame body 22 is connected to the bracket 21, the -X face of the outer frame body 22 is connected to the heat sink 4, the +Z plate 25 provides a mounting surface for the hood mounting flange 101, and is thermally insulated from the hood 1, and the -Y plate 24 is provided with a power supply and communication interface 241 for the camera, and the cables inside the camera are connected to the outside through the power supply and communication interface 241.

[0083] The camera frame 2 is used to provide support and envelopment for the optical machine body 3 and the lens hood 1.

[0084] like Figure 5 As shown, the optical machine body 3 adopts an off-axis three-mirror optical system, which has the characteristics of a large field of view and high imaging quality.

[0085] like Figure 5 and Figure 6 As shown, the optical machine body 3 includes a scanning mechanism assembly 31, a telescope assembly 32, a slit 33, a collimating lens assembly 34, a grating assembly 35, a detector assembly 36, a detector circuit box 37, a high-voltage circuit box 38 and an optical machine body frame 39.

[0086] The reflector components such as the telescope assembly 32, the slit 33, the collimator assembly 34 and the grating assembly 35 are all fixed from the outside to the reserved installation interface of the optical machine main frame 39 through the installation adapter flange, which is convenient for optical assembly and testing.

[0087] The telescope assembly 32 , the slit 33 , the collimator assembly 34 and the grating assembly 35 are heat-conductingly mounted on the optical machine main frame 39 , and the temperature of the reflector assembly can be indirectly controlled by attaching a heater to the optical machine main frame 39 .

[0088] The reflectors are all microcrystalline glass with a low thermal expansion coefficient. In order to ensure the surface index of the reflector, the reflector frame is made of titanium alloy material that matches the thermal expansion coefficient of the microcrystalline glass. Preferably, a heater is attached to the back of the reflector assembly to heat and keep the reflector assembly warm.

[0089] The optical machine main frame 39 is processed by one-piece molding, and the weight-reducing groove is designed for lightweight structure design, which not only effectively reduces the weight of the whole machine but also ensures the mechanical stability of the optical machine structure. The optical machine main frame 39 adopts 2A12 hard aluminum material with good thermal properties. Its high thermal conductivity reduces the temperature gradient of the optical machine main frame 39, reduces the thermal deformation of the optomechanical structure, improves the dimensional stability of the optical system, and ensures the imaging quality when the camera is working.

[0090] The inside of the optical machine main frame 39 is sprayed with stray light-eliminating black paint to suppress stray light from entering the optical system.

[0091] like Figure 7 As shown, the scanning mechanism assembly 31 includes an aluminum-based silicon carbide U-shaped frame 311, a scanning mirror assembly 312, a motor drive shaft assembly 313 and a scanning mechanism L-shaped heat pipe 314.

[0092] The scanning mechanism assembly 31 is installed in a heat-insulated manner from the optical machine main frame 39 to reduce the uncontrollable heat generated by the motor from entering the optical machine main frame 39 .

[0093] The evaporation section of the L-shaped heat pipe 314 is thermally connected to the aluminum-based silicon carbide U-shaped frame 311 through a flange, and the condensation section is thermally connected to the heat sink 4 through a flange, so that the scanning mechanism component 31 has a good heat dissipation channel. The inside of the tube body of the scanning mechanism L-shaped heat pipe 314 is a capillary porous structure filled with liquid, and the tube body and the flange are integrally formed. The aluminum-based silicon carbide has a high thermal conductivity, which ensures that the U-shaped frame 311 has a good temperature gradient, reduces the thermal deformation caused by the temperature difference, reduces the friction torque caused by the thermal deformation, ensures the driving torque margin of the scanning mechanism, and improves the reliability of the scanning mechanism component 31.

[0094] like Figure 8 and Fig.10 As shown, the detector assembly 36 includes an MCP assembly 361 , an MCP bracket 362 , a voltage divider assembly 363 , an L-shaped heat sink 364 , a detector L-shaped heat pipe 365 and a heat collection plate 366 .

[0095] The detector assembly 36 is thermally insulated from the main optical machine frame 39. The heat generated by the pressure divider assembly 363 and the MCP assembly 361 can be led to the heat collection plate 366 through the MCP bracket 362 and the L-shaped heat sink 364. The heat collection plate 366 is connected to the +X surface of the heat sink 4 through the detector L-shaped heat pipe 365. This technical solution enables the detector assembly to have an independent heat dissipation path and will not introduce the uncontrollable heat generated by it into the main optical machine frame 39. The heat dissipation path improves the temperature control accuracy of the detector assembly 36, reduces its thermal deformation, and ensures the stability of optical imaging.

[0096] The detector assembly 36 can be optically adjusted in the optical machine main frame 39 using a translation stage.

[0097] Fig. 9 In order to better illustrate the components and their relationships on the detector circuit box assembly 37, two state diagrams are combined for illustration. Among them, (a) is an overall diagram of the detector circuit box assembly 37, and (b) is an exploded diagram of the detector circuit box assembly 37. Fig. 9 As shown, the detector circuit box assembly 37 includes a detector circuit box cover 371 , a detector circuit board 372 , a detector circuit box heat conductive sheet 373 , a detector circuit box frame 374 , a high-power power supply module 375 , and a thermal insulation pad 376 .

[0098] The detector circuit board 372 and the high-power power module 375 are thermally connected to the detector circuit box heat conductive sheet 373. The high-power power module 375 is welded on the circuit board through the through hole of the detector circuit box heat conductive sheet 373. The heat generated by the detector circuit board 372 and the high-power power module 375 is transferred to the detector circuit box frame 374, and further transferred to the detector circuit box cover 371. The detector circuit box 37 is thermally insulated and connected to the optical machine main frame 39 through the thermal insulation pad 376.

[0099] like Fig.10 As shown, the +X surface of the detector circuit box 37 and the high-voltage circuit box 38 are both heat-insulated and installed with the optical machine main frame 39; the detector circuit box cover 371 and the high-voltage circuit box cover 381 are both connected to the +X surface of the heat sink 4, and the heat of the electronic components in the circuit box is transferred to the heat sink through the circuit box structure. At the same time, the circuit box structure, as a load-bearing structure, connects the optical machine main body 3 and the heat sink 4 in the X direction, increases the rigidity of the optical camera in the X direction, and improves the mechanical stability of the optical camera; this technical solution enables the circuit box to have the functions of load-bearing and heat-conducting, and improves the integration of the whole machine.

[0100] like Fig.10 As shown, the scanning mechanism L-shaped heat pipe 314 serves as the only heat dissipation channel of the scanning mechanism component 31, and directs the heat generated by it to the heat sink 4; the heat collection plate 366 and the detector L-shaped heat pipe 365 ensure the heat transfer path from the detector component 36 to the heat sink 4; the detector circuit box 37 and the high-voltage circuit box 38 are thermally connected to the heat sink 4 through their respective -X surfaces; the heat generated by the components with heating devices is uncontrollable, and the heat is effectively dissipated by directing the heat pipe or direct thermal connection to the heat sink 4; the heat pipe 5 installed on the -X surface of the heat sink 4 can quickly transfer the heat on the lower side of the heat sink 4 to the upper cold end, thereby improving the heat dissipation efficiency and ensuring that each heating component has a stable operating temperature.

[0101] The optical machine main frame 39 and the connected heating components are all installed in a heat-insulating manner and are insulated from the camera outer frame 2 to avoid the influence of the internal heat source of the optical camera and the heat flow outside the space on the temperature of the optical machine main frame 39. At the same time, a heating plate is attached to the optical machine main frame 39 for insulation. By controlling the power of the heating plate, a very high temperature control accuracy of the optical machine main body 39 can be achieved, thereby reducing the thermal deformation of the optical machine structure and improving the stability of the optical camera working in the complex temperature environment of outer space.

[0102] Two external heat pipes 5 are arranged on the -X surface of the heat sink 4, which not only ensures the uniformity of heat distribution of the heat sink and improves the heat dissipation efficiency, but also enhances the lateral rigidity of the heat sink.

[0103] The heat sink 4 is installed on the -X surface of the camera frame 2 as a load-bearing structure, and the upper part of the heat sink 4 is thermally connected to the light shield 1. The three are mutually constrained, further improving the rigidity of the optical camera in the X direction and ensuring the strength of the whole machine.

[0104] The above technical solution uses camera parts as single-machine heat dissipation surfaces for independent temperature control, reducing the heat dissipation burden for the entire satellite while ensuring that the camera has a suitable operating temperature. By optimizing the structure and layout of the heat dissipation path, the integration and heat dissipation efficiency of the entire machine are improved, which also saves weight and size resources for the entire satellite.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that any modification or equivalent replacement of the technical solutions of the present invention does not depart from the spirit and scope of the technical solutions of the present invention and should be included in the scope of the claims of the present invention.

Claims

1. A lightweight and highly stable space optical camera structure, comprising: A light shield (1), a camera frame (2), and an optical machine body (3), characterized in that the light shield (1) and a high-stability space optical camera structure further include a heat sink (4) and an external heat pipe (5) arranged on the -X surface of the heat sink (4); the -X surface of the light shield (1) is provided with reinforcing ribs (103), and embedded parts (102) are bonded on the reinforcing ribs (103) to provide a mounting interface for the heat sink (4); the heat sink (4) serves as a load-bearing structure and is fixed to the -X surface of the camera frame (2) and the mounting interface of the light shield (1); the light shield (1) is connected to the +Z surface of the camera frame (2), and the three are mutually constrained; The optical machine body (3) is provided with a scanning mechanism assembly (31), a detector assembly (36), a detector circuit box (37), a high-voltage circuit box (38) and an optical machine body frame (39); the scanning mechanism assembly (31) comprises an aluminum-based silicon carbide U-shaped frame (311) and a scanning mechanism L-shaped heat pipe (314); the evaporation section of the L-shaped heat pipe (314) is thermally connected to the aluminum-based silicon carbide U-shaped frame (311) through a flange, and the condensation section is thermally connected to a heat sink (4) through a flange, so as to form a heat dissipation channel of the scanning mechanism assembly (31); the detector assembly (36) and the optical machine body frame (39) are thermally insulated, and the heat generated by the detector assembly (36) can be thermally conducted to the heat sink (4) through an MCP bracket (362), an L-shaped heat sink (364), and a detector L-shaped heat pipe (365); the detector circuit box (37) and the high-voltage circuit box (38) both conduct the heat to the heat sink (4) through a heat pipe or a direct thermal connection.

2. The lightweight and highly stable spatial optical camera structure according to claim 1, characterized in that: The light shield (1) further comprises a light shield mounting flange (101), a light blocking ring (104), a +X direction reinforcing rib (105) and a light shield side wall (106); The -X-direction reinforcing ribs (103), the +X-direction reinforcing ribs (105) and the light-blocking ring (104) provide lateral and longitudinal support for the side wall (106) of the light shield; wherein: The side wall (106) of the light shield is in an inverted cone shape, and a plurality of light blocking rings (104) are arranged inside the light shield (1) and are arranged gradually denser along the -Z direction of incident light. The side wall (106) of the light shield and the light blocking rings (104) have a progressive thickness along the +Z direction.

3. The lightweight and highly stable spatial optical camera structure according to claim 1, characterized in that: The camera outer frame (2) has a bracket (21); the bracket (21) has a bracket mounting interface (211) for fixing the camera on the satellite platform and is thermally insulatedly connected to the satellite platform; the bracket (21) increases the height of the camera on the satellite platform.

4. The lightweight and highly stable spatial optical camera structure according to claim 1, characterized in that: The detector assembly (36) comprises an MCP assembly (361), an MCP bracket (362), a voltage divider assembly (363), an L-shaped heat sink (364), a detector L-shaped heat pipe (365) and a heat collection plate (366), wherein The heat generated by the pressure divider component (363) and the MCP component (361) passes through the MCP bracket (362), and the L-shaped heat sink (364) leads to the heat collection plate (366), and the heat collection plate (366) is connected to the +X surface of the heat sink (4) through the detector L-shaped heat pipe (365).

5. The lightweight and highly stable spatial optical camera structure according to claim 1, characterized in that: The first embedded part (102) is threadedly connected to the heat dissipation plate (4).

6. The lightweight and highly stable spatial optical camera structure according to claim 1, characterized in that: The material of the sunshade (1) and the bracket (21) includes M40J resin-based carbon fiber, and is integrally wound and formed by ply laying.

7. The lightweight and highly stable spatial optical camera structure according to claim 1, characterized in that: The optical machine main frame (39) is integrally formed and has a weight-reducing groove structure, and its material is hard aluminum.

8. The lightweight and highly stable spatial optical camera structure according to claim 1, characterized in that: The detector circuit box (37) and the high-voltage circuit box (38) are respectively connected to the optical machine main frame (39) in a heat-insulating manner in the +X direction and are heat-conductively connected to the heat sink (4) in the -X direction.

9. The lightweight and highly stable spatial optical camera structure according to claim 1, characterized in that: The optical machine main frame (39) is thermally insulated from the internal heating components and the camera outer frame (2); a heating sheet is attached to the optical machine main frame (39) for heat preservation, and the temperature is controlled by controlling the power of the heating sheet.

10. The lightweight and highly stable spatial optical camera structure according to claim 1, characterized in that: The +Z surface of the bracket (21) is provided with a second titanium alloy embedded part (212), which serves as a mounting interface for the outer frame body (22) and the optical machine body (3).

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