On-board layout structure of laser optical head

Abstract

This invention provides an on-board layout structure for a laser optical head, including a laser optical head, a head support, a thermal radiator, an L-shaped external heat pipe, and a slanted support structure. The head support is mounted on the outer surface of the satellite's ground plane, the slanted support structure is mounted below the ground plane at the bottom of the head support, the laser optical head is mounted on the head support, the thermal radiator is mounted on the side of the ground plane, the first end of the L-shaped external heat pipe is connected and fixed to the heat dissipation part of the laser optical head, and the opposite second end of the L-shaped external heat pipe is connected and fixed to the outer surface of the thermal radiator; and a cerium glass silver-plated secondary surface mirror is attached to the outer surface of the thermal radiator. Thus, this invention can solve the problem of thermal control layout for satellite laser optical head payloads.

Description

Technical Field

[0001] This invention relates to the field of satellite laser technology, and in particular to an on-board layout structure for a laser optical head. Background Technology

[0002] A laser terminal payload is a payload device capable of high-speed data communication transmission, with the optical head being a crucial component. With the development of satellite technology, communication satellites have increasingly higher requirements for high-speed data transmission. Traditional satellite communication technology, using microwaves as a medium, is limited by bandwidth, making it difficult to significantly increase data transmission capacity and rate. Satellite laser communication technology, with its large communication capacity, high communication rate, low power consumption, and strong anti-interference capabilities, has enormous development potential, and the application of laser terminals has gradually moved from on-orbit testing to commercial operation and application.

[0003] Humans began researching satellite laser technology in the mid-1960s and conducted experimental verification in the 1990s. Currently, the technology is rapidly advancing. For example, the optical module of the US LLCD program uses an L-shaped gimbal configuration, the optical head of the US QE company uses a periscope configuration, the optical head of the Tesat company uses a variable stiffness shaft system for support, giving it high rigidity, and the JAXA laser pointing mechanism uses a single-mirror configuration. Generally, optical heads are located on the satellite surface, and data is transmitted to the target user through lens pointing adjustment. However, some laser terminal payloads still face technical challenges in practice, and successful experience has not yet been achieved in the thermal control layout of optical head payloads for GEO communication satellites.

[0004] Existing patent "A Thermal Control Method for a GEO Orbit Satellite Laser Device" proposes measures to control the heat conduction and radiation of the laser device, designing a reasonable heat transfer path to transfer the internal heat dissipation of the laser device to the heat dissipation surface for dissipation. Existing patent "Inter-Satellite Laser Communication Terminal Optical Box Thermal Control System and Method" proposes a thermal control method for controlling the temperature stability of the inter-satellite laser communication optical box to achieve precise temperature control. While the above methods can guarantee the temperature requirements of the laser device, the on-board layout of the laser is complex. These methods do not practically consider the layout of the laser optical head, laser terminal, etc., and cannot meet the layout requirements of other large external components such as the pyrotechnic clamping seat, 1 square meter heat dissipation area, fiber optic winding box fiber length, and antenna near the optical head.

[0005] Therefore, there is an urgent need for an on-board layout of a laser optical head that is adapted to laser communication and has a reasonable thermal control design. Summary of the Invention

[0006] The purpose of this invention is to provide an on-board layout structure for a laser optical head that can solve the problems of layout and thermal control design of the laser optical head payload for geostationary orbit satellites.

[0007] To achieve the above objectives, the present invention provides an on-board layout structure for a laser optical head, comprising a laser optical head, a head support, a thermal radiator, an L-shaped external heat pipe, and a slanted support structure. The head support is mounted on the outer surface of the satellite's ground plane, the slanted support structure is mounted below the ground plane at the bottom of the head support, the laser optical head is mounted on the head support, the thermal radiator is mounted on the side of the ground plane, the first end of the L-shaped external heat pipe is connected and fixed to the heat dissipation part of the laser optical head, and the opposite second end of the L-shaped external heat pipe is connected and fixed to the outer surface of the thermal radiator; and a cerium glass silver-plated secondary surface mirror is attached to the outer surface of the thermal radiator.

[0008] Furthermore, the laser inclined support structure includes a sealing plate, at least one inclined support triangle plate, and at least one lifting structure plate. The sealing plate is perpendicularly connected to the opposing floor. The inclined support triangle plate is located on the side of the sealing plate and is connected and fixed to the bottom surface of the opposing floor below the head support. The lifting structure plate is located on the side of the sealing plate and extends outward to be connected and fixed to the heat radiator, so as to provide a fixed connection point for the lower part of the heat radiator.

[0009] Furthermore, the probe structure plate is a carbon-skinned aluminum honeycomb sandwich structure, and lateral embedded parts are provided on both sides of the structure plate. The lateral embedded parts are used to connect the sealing plate and the heat radiator, and provide a fixed connection point for the lower part of the heat radiator.

[0010] Furthermore, the first and second ends of the L-shaped external heat pipe are distributed at right angles. The first and second ends are respectively fixed to the heat dissipation part of the laser optical head and the outer surface of the heat radiator by clamps. Thermal grease is applied between the L-shaped external heat pipe and the heat dissipation part and the heat radiator.

[0011] Furthermore, the heat radiator is connected to the floor via at least one fixed corner box.

[0012] Furthermore, the heat radiator is composed of an aluminum skin and an aluminum honeycomb core structure. The aluminum skin includes an outer skin and an inner skin, and the aluminum honeycomb core structure is disposed between the outer skin and the inner skin.

[0013] Furthermore, the aluminum honeycomb core structure is pre-embedded with a plurality of first-direction I-shaped single-hole axial groove aluminum and a plurality of second-direction I-shaped single-hole axial groove aluminum. The first-direction I-shaped single-hole axial groove aluminum and the second-direction I-shaped single-hole axial groove aluminum are perpendicularly intersecting each other, and both the first-direction I-shaped single-hole axial groove aluminum and the second-direction I-shaped single-hole axial groove aluminum penetrate the aluminum skin.

[0014] Furthermore, the thickness of the thermal radiator is 25.6 mm; the outer surface of the aluminum skin is covered with the cerium glass silver-plated secondary surface mirror, and the inner surface of the aluminum skin is covered with a multi-layer heat insulation component.

[0015] Furthermore, the head support includes a support body and a plurality of inner and outer sleeves disposed on the support body. The support body is manufactured using a composite material processing technology, and the inner and outer sleeves are manufactured using a machining process.

[0016] Furthermore, heat insulation pads are provided between the head support and the laser optical head and the mounting surface of the floor, respectively.

[0017] The onboard layout structure of the laser optical head provided by this invention is highly compatible with large, long-life geostationary orbit satellite platforms on the market, and can be widely applied to all GEO orbit satellites based on this platform and configured with similar laser optical heads. The heat dissipation design, which combines the laser optical head support with a thermal radiator, has passed qualification-level thermal balance tests. Under various operating conditions, the highest temperature of the laser optical head barrel at the end of the satellite's lifespan is 19.3℃, leaving a margin of 4.7℃ from the upper limit of the operating temperature (24℃). This heat dissipation method can be applied to the layout and thermal design of laser optical head equipment in satellites with complex configurations. It meets the mechanical environment requirements of the DFH-4 series platform satellites and can serve as a design reference for related equipment supports. The configuration is simple and easy to install, overcoming the shortcomings of complex heat pipe conduction forming processes, high assembly precision requirements, and complex assembly. After qualification-level mechanical testing, it meets the mechanical environment requirements of the DFH-4 series platform satellites. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the on-board layout structure of the laser optical head provided in the first embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the support structure for the thermal radiator in the on-board layout structure of the laser optical head provided in the first embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the head support structure of the on-board layout structure of the laser optical head provided in the first embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the internal structure of the thermal radiator in the on-board layout structure of the laser optical head provided in the first embodiment of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0023] It should be noted that references to "an embodiment," "embodiment," "example embodiment," etc., in this specification refer to the described embodiment including specific features, structures, or characteristics, but not every embodiment must include these specific features, structures, or characteristics. Furthermore, such expressions do not refer to the same embodiment. Moreover, when describing specific features, structures, or characteristics in conjunction with embodiments, whether or not explicitly described, it is indicated that incorporating such features, structures, or characteristics into other embodiments is within the knowledge of those skilled in the art.

[0024] Furthermore, certain terms are used in the specification and subsequent claims to refer to specific components or parts. Those skilled in the art will understand that manufacturers may use different names or terms to refer to the same component or part. This specification and subsequent claims do not distinguish components or parts by differences in name, but rather by differences in function. The terms "comprising" and "including" used throughout the specification and subsequent claims are open-ended and should be interpreted as "including but not limited to." Additionally, the term "connection" here includes any direct and indirect electrical connection means. Indirect electrical connection means include connections made through other means.

[0025] Figure 1This invention illustrates an onboard layout structure of a laser optical head according to an embodiment of the present invention, including a laser optical head 1, a head support 2, a thermal radiator 3, an L-shaped external heat pipe 6, and a slanted support structure. The head support 2 is mounted on the outer surface of the satellite's ground plane 7, and the slanted support structure is mounted below the ground plane 7 at the bottom of the head support 2. The laser optical head 1 is mounted on top of the head support 2, and the thermal radiator 3 is mounted on the side of the ground plane 7. The first end of the L-shaped external heat pipe 6 is connected and fixed to the heat dissipation part of the laser optical head 1, and the opposite second end of the L-shaped external heat pipe 6 is connected and fixed to the outer surface of the thermal radiator 3. A cerium glass silver-plated secondary surface mirror is attached to the outer surface of the thermal radiator 3. The heat generated by the laser optical head 1 is transferred from the heat dissipation part to the thermal radiator 3 for heat dissipation through the L-shaped external heat pipe 6; that is, the thermal radiator 3 provides more heat dissipation area for the laser optical head 1, and the thermal radiator 3 is located away from the laser optical head 1 to avoid the heat affecting the instrument's function. The thermal radiator 3 dissipates heat into the surrounding environment through the cerium glass silver-plated secondary surface mirror on its outer surface.

[0026] The laser optical head 1 can be a 150mm diameter latitude and longitude laser optical head load; of course, other types of laser optical head loads can also be used.

[0027] See Figure 2 The laser inclined support structure includes a sealing plate 8, at least one inclined support triangle plate, and at least one lifting structure plate 5. The sealing plate 8 is perpendicularly connected to the ground plane 7. The inclined support triangle plate is located on the side of the sealing plate 8 and is fixedly connected to the bottom surface of the ground plane 7 below the head support 2. The lifting structure plate 5 is located on the side of the sealing plate 8 and extends outward to connect and fix to the heat radiator 3, providing a fixed connection point for the lower part of the heat radiator 3. That is, one end of the lifting structure plate 5 is connected to the side of the sealing plate 8, and the other end extends outward to connect to the heat radiator 3 at the edge of the ground plane 7, so as to support the heat radiator 3 from the side.

[0028] The sealing plate 8 is a quadrilateral plate; the sealing plate 8 is fixed to the lower surface of the floor 7 using corner boxes; this embodiment includes two inclined support triangular plates and two lifting structure plates 5, and the inclined support triangular plates are also fixed to the sealing plate 8 using corner boxes.

[0029] In this embodiment, the probe structure plate 5 is preferably a carbon-skinned aluminum honeycomb sandwich structure. Lateral embedded parts are designed at both ends of the probe structure plate 5 to connect to the sealing plate 8 and the heat radiator 3, respectively, to provide fixed connection points for the lower part of the heat radiator. Specifically, the probe structure plate 5 can adopt a 21mm thick carbon skin combined with an aluminum honeycomb core structure, that is, the aluminum honeycomb core structure is encapsulated in the carbon skin structure. M4-sized lateral embedded parts can be used for connection to the sealing plate 8 and the heat radiator 3, respectively.

[0030] A heat insulation pad is installed between the mounting surface of the probe structure plate 5 and the heat radiator 3.

[0031] This embodiment specifically includes two L-shaped external heat pipes 6, with each L-shaped external heat pipe 6 having its two ends connected to the heat dissipation part of the laser optical head 1 and the outer surface of the heat radiator 3, respectively.

[0032] Furthermore, the first and second ends of the L-shaped external heat pipe 6 are arranged at right angles. The first and second ends are respectively fixed to the heat dissipation part of the laser optical head 1 and the outer surface of the heat radiator 3 by clamps. Thermal grease is applied between the L-shaped external heat pipe 6 and the heat dissipation part and the heat radiator 3. Specifically, the L-shaped external heat pipe 6 is a single-hole I-shaped rectangular channel heat pipe CDRG-NH3-G1-30×12(J). The two ends of the heat pipe are connected and fixed to the heat dissipation part of the laser optical head 1 and the outer surface of the heat radiator 3 by clamps, respectively, to transfer the heat of the optical head to the radiator for heat dissipation.

[0033] The heat radiator 3 is connected to the floor 7 via at least one fixed corner box 4. Specifically, the fixed corner box 4 is a thin-shell tripod made of 2A12T4 aluminum alloy with a conductive anodized surface and is machined. It is used to fix the heat radiator 3 to the edge of the floor 7 and provide connection rigidity between the heat radiator 3 and the floor 7. In addition, a heat insulation pad is installed between the fixed corner box 4 and the heat radiator 3.

[0034] The heat radiator 3 in this embodiment is composed of an aluminum skin and an aluminum honeycomb core structure. The aluminum skin includes an outer skin 14 and an inner skin 15, and the aluminum honeycomb core structure is disposed between the outer skin 14 and the inner skin 15. Specifically, the thickness of the heat radiator 3 is 25.6 mm; wherein, the thickness of both the outer skin 14 and the inner skin 15 is 0.3 mm, and the height of the aluminum honeycomb core structure is 25 mm; a cerium glass silver-plated secondary surface mirror is attached to the outer surface of the aluminum skin 14, and a multi-layer heat insulation component is covered on the inner surface of the aluminum skin 15.

[0035] See Figure 4The aluminum honeycomb core structure contains several first-direction I-shaped single-hole axial slot aluminum 9s and several second-direction I-shaped single-hole axial slot aluminum 10s. The first-direction I-shaped single-hole axial slot aluminum 9s and the second-direction I-shaped single-hole axial slot aluminum 10s are perpendicularly intersecting each other, and both the first-direction I-shaped single-hole axial slot aluminum 9s and the second-direction I-shaped single-hole axial slot aluminum 10s penetrate the aluminum honeycomb core structure. Specifically, in this embodiment, two X-direction I-shaped single-hole axial slot aluminum-ammonia heat pipes 9 (near the inner skin 15) and four Z-direction I-shaped single-hole axial slot aluminum-ammonia heat pipes 10 (near the outer skin 14) are pre-embedded in the honeycomb panel interlayer of the heat radiator 3 to form a heat pipe network. The X-direction I-shaped single-hole axial groove aluminum 9 is CDRG-NH3-G1-30×12.8(J) and is located near the inner skin; the Z-direction I-shaped single-hole axial groove aluminum 10 is CDRG-NH3-G1-30×12(J) and is located near the outer skin; the heat pipes in both the X and Z directions penetrate the entire radiant plate.

[0036] Four Φ6.5 inner hole sleeves 11 are also installed on the thermal radiator 3. The screw heads are fixed to the probe structure plate 5 with four M5 screws at the +Y direction surface of the thermal radiator 3.

[0037] The L-shaped external heat pipe 6 connected to the outer surface of the heat radiator 3 is fixed with clamps and M3 screws. Specifically, multiple M3 embedded parts 12 need to be pre-embedded on the outer surface of the heat radiator 3.

[0038] Eight holes 13 on the +Z side of the inner surface of the heat radiator 3 are used for installation and fixation with the fixing corner box 4 of the floor 7.

[0039] In this embodiment, the thermal radiator 3 has an OSR / UV-OSR sheet (a silver-plated cerium-doped glass secondary surface mirror) attached to its outer surface, providing approximately 0.225 μm of heat to the laser optical head 1. 2 The heat dissipation area is large. The inner surface of the heat radiator 3 is connected to the side of the probe structure plate 5 and the fixed corner box 4 by screws. The L-shaped external heat pipe 6 is fixed to the outer surface of the heat radiator 3 by clamps.

[0040] The thermal radiator 3 used in this embodiment weighs 1.15 kg, and the L-shaped external heat pipe 6 weighs 0.5 kg. The configuration is simple and easy to install, which solves the shortcomings of complex heat pipe conduction forming process, high assembly precision requirements and complicated assembly. After qualification level mechanical test, it can meet the mechanical environment requirements of DFH-4 series platform satellites.

[0041] Furthermore, the head support 2 includes a support body and multiple inner and outer sleeves disposed on the support body. The support body is manufactured using a composite material processing technology, while the inner and outer sleeves are manufactured using a machining process. In this embodiment, the head support is made of CCM40J composite material and 2A12T4 aluminum alloy. The support body is manufactured using a composite material processing technology, while the inner and outer sleeves are manufactured using a machining process. The support body is entirely made of CCM40J composite material, with a symmetrical ply layout of [0° / +45° / -45° / 90° / 0° / +45° / -45° / 90° / 0° / +45° / -45° / 90° / ], a single layer thickness of 0.125 mm, and a total of 24 layers. See also Figure 3 The mounting surface of the head support 2, opposite the laser optical head 1, is designed with 15 M5 threaded holes for securing the equipment with fasteners. These threaded holes are provided by inner and outer bushings. The head support 2 and the spacecraft panel are designed with 15 through holes corresponding to M5 screws for mounting the optical head and support assembly onto the satellite. Thermal pads are installed between the head support 2 and the mounting surfaces of the laser optical head 1 and the ground plane 7. Thermal pads are also installed between the head support 2 and the spacecraft panel.

[0042] The head support 2 used in this embodiment is lightweight, weighing only 1.8 kg. After the support stiffness and accuracy retention have been tested at the qualification level, the accuracy change in all directions of the laser optical head 1 is less than 0.01°, which can meet the mechanical environment requirements of the DFH-4 series platform satellite and can be used as a design reference for related equipment supports.

[0043] In summary, the on-board layout structure of the laser optical head provided by this invention has good compatibility with large, long-life geostationary orbit satellite platforms on the market, and can be widely applied to all GEO orbit satellites based on this platform and configured with similar laser optical heads. The heat dissipation design, which combines the laser optical head support with thermal radiator cooling, has passed qualification-level thermal balance tests. Under various operating conditions, the highest temperature of the laser optical head barrel at the end of the satellite's lifespan is 19.3℃, leaving a margin of 4.7℃ from the upper limit of the operating temperature (24℃). This heat dissipation method can be applied to the layout and thermal design of laser optical head equipment in satellites with complex configurations. It meets the mechanical environment requirements of the DFH-4 series platform satellites and can serve as a design reference for related equipment supports. The configuration is simple and easy to install, overcoming the shortcomings of complex heat pipe conduction forming processes, high assembly precision requirements, and complex assembly. After qualification-level mechanical testing, it meets the mechanical environment requirements of the DFH-4 series platform satellites.

[0044] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. An on-board layout structure of a laser optical head, characterized by, The laser optical head, the head support, the heat radiator, the L-shaped external heat pipe and the inclined support structure, the head support is installed on the outer surface of the satellite's earth board, the inclined support structure is installed below the earth board at the bottom of the head support, the laser optical head is installed on the head support, the heat radiator is installed on the side end of the earth board, the first end of the L-shaped external heat pipe is connected and fixed with the heat dissipation part of the laser optical head, the second end opposite to the L-shaped external heat pipe is connected and fixed with the outer surface of the heat radiator, and the outer surface of the heat radiator is pasted with a cerium glass silver-coated secondary surface mirror. The inclined support structure comprises a blocking plate, at least one inclined support triangular plate and at least one probe lifting structure plate, the blocking plate is connected with the earth board vertically, the inclined support triangular plate is arranged on the side of the blocking plate and is connected and fixed with the bottom surface of the earth board below the head support, and the probe lifting structure plate is arranged on the side of the blocking plate and extends outward to be connected and fixed with the heat radiator to provide a fixed connection point for the lower end part of the heat radiator. The probe lifting structure plate is a carbon skin aluminum honeycomb sandwich structure, and lateral embedded parts are arranged on both sides of the structure plate respectively, the lateral embedded parts are used to connect the blocking plate and the heat radiator to provide a fixed connection point for the lower end part of the heat radiator. The first end and the second end of the L-shaped external heat pipe are distributed at right angles, the first end and the second end are respectively installed and fixed on the heat dissipation part of the laser optical head and the outer surface of the heat radiator through a clamp, and the L-shaped external heat pipe is coated with thermal conductive silicone grease between the heat dissipation part and the heat radiator respectively.

2. The on-board layout of a laser optical head according to claim 1, characterized in that, The heat radiator and the earth board are connected through at least one fixed angle box.

3. The on-board layout of a laser optical head according to claim 1, characterized in that, The heat radiator is composed of an aluminum skin and an aluminum honeycomb core structure, the aluminum skin comprises an outer skin and an inner skin, and the aluminum honeycomb core structure is arranged between the outer skin and the inner skin.

4. The on-board layout of a laser optical head according to claim 3, characterized in that, A plurality of first I-shaped single-hole axial groove aluminums and a plurality of second I-shaped single-hole axial groove aluminums are pre-embedded in the aluminum honeycomb core structure, the first I-shaped single-hole axial groove aluminums and the second I-shaped single-hole axial groove aluminums are distributed vertically, and the first I-shaped single-hole axial groove aluminums and the second I-shaped single-hole axial groove aluminums penetrate the aluminum skin.

5. The on-board layout of a laser optical head according to claim 3, characterized in that, The thickness of the heat radiator is 25.6 mm, the outer surface of the aluminum skin is pasted with the cerium glass silver-coated secondary surface mirror, and the inner surface of the aluminum skin is covered with a plurality of thermal insulation components.

6. The on-board layout of a laser optical head according to claim 1, characterized in that, The head support comprises a support body and a plurality of inner hole sleeves and outer hole sleeves arranged on the support body, the support body is made of a composite material processing technology, and the inner hole sleeves and the outer hole sleeves are made of a machining processing technology.

7. The on-board layout of a laser optical head according to claim 1, characterized in that, Heat insulation pads are arranged between the head support and the mounting surface of the laser optical head and the earth board respectively.

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