# Thermal Stability Design of Asymmetric Support Structure for an Off-Axis Space Camera  
[PERSON]  
1 Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China; [EMAIL_ADDRESS] (WS.S. ); [EMAIL_ADDRESS] (S.L. ); [EMAIL_ADDRESS] (Y.X.) [PERSON]  
1 Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China; [EMAIL_ADDRESS] (WS.S. ); [EMAIL_ADDRESS] (S.L. ); [EMAIL_ADDRESS] (Y.X.) [PERSON]  
1 Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China; [EMAIL_ADDRESS] (WS.S. ); [EMAIL_ADDRESS] (S.L. ); [EMAIL_ADDRESS] (Y.X.) [PERSON]  
1 Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China; [EMAIL_ADDRESS] (WS.S. ); [EMAIL_ADDRESS] (S.L. ); [EMAIL_ADDRESS] (Y.X.) Footnote 1: [[https://www.mdpi.com/journal/applsci](https://www.mdpi.com/journal/applsci)]([https://www.mdpi.com/journal/applsci](https://www.mdpi.com/journal/applsci))  
Footnote 2: [[https://www.mdpi.com/journals](https://www.mdpi.com/journals)]([https://www.mdpi.com/journals](https://www.mdpi.com/journals))  
of optical components along the optical axis caused by thermal deformation need to be considered due to the system's symmetry [5; 6]. The off-axis reflective optical system is widely used in space remote sensing camera because of its advantages of a larger field of view and the lack of central occlusion [7; 8]. However, the off-axis remote sensing camera has an obvious asymmetrical structure, and its reflector exhibits a relative displacement in many directions when it is subjected to a temperature load. Therefore, the thermal stabil-ity design of off-axis cameras needs to reduce the thermal deformation in multiple direc-tions at the same time, which makes the design more difficult [9]. Carbon-fiber-reinforced plastics (CFRPs) have excellent mechanical properties, such as high stiffness, high strength and low coefficient of thermal expansion (CTE), and are considered to be the next generation of aerospace application materials [10; 11; 12; 13]. In recent years, structural thermal stability has increasingly been accomplished through the use of carbon-fiber-reinforced composites. [PERSON] made a low expansion truss support structure with carbon-fiber-reinforced materials for FORMOSAT-5 remote sensing [14]; [PERSON] copied a prototype carbon-fiber-reinforced plastics (CFRP) panel for a 5-m Dome A Terahertz Explorer antenna using resin-rich layer technology [15]. [PERSON] used cyanate ester carbon fiber composite to construct the supporting structure of a solar telescope [16]. In addition, researchers have paid attention to thermal character-istics in the design of carbon fiber materials. By adjusting the angle and sequence of the carbon fiber layer, the coefficient of thermal expansion of the CFRP structure can be ad-justed, even close to zero thermal expansion [17]. [PERSON] researched the effect of the angle error of carbon fiber ply on the coefficient of thermal expansion [18]. [PERSON] manufactured carbon fiber truss bars with an extremely low coefficient of axial thermal expansion through the adjustment of the carbon fiber ply angle [19]. [PERSON] quantita-tively studied the axial thermal expansion coefficient of the carbon fiber rod through the CTE function, and demonstrated passive thermal compensation for an off-axis space cam-era in the optical axis direction [20]. However, in these studies, the thermal stability design was only committed to ensuring the position accuracy of the structure along a certain main direction under the thermal load, which is scarcely sufficient to meet the thermal stability requirements of the asymmetric support structure in an off-axis remote sensing camera. In this study, we solved the problem of how to use carbon-fiber-reinforced compo-sites to reduce the thermal deformation of an asymmetric structure in an off-axis remote sensing camera.