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With the rapid development of space optical remote sensor technology, there are also increasing demands on the deep-space cryogenic background infrared detection capability of optical remote sensors, for this type of optical remote sensor, generally need cryogenic optical system to achieve the detection of deep space background cryogenic targets, to reduce heat leakage from cryogenic optical systems, reduced space cooling system capability requirements for remote sensors, and reduce the thermal deformation and thermal stress of the optical system, in order to ensure the accuracy of the optical system, the design of the support structure with high thermal insulation efficiency and small thermal stress effects is of great importance. The main structural forms used for the support structure of cryogenic systems at home and abroad are plastic heat insulation sleeve, fiberglass tie rod, etc. it is difficult to balance the thermal insulation efficiency and support stiffness requirements by using the plastic spacer sleeve form, for cryogenic optical system support with large temperature differences, this structure is difficult to achieve. Although the Fiber Reinforced Polymer (FRP) tie support structure can properly improve the thermal insulation efficiency and ensure a certain support stiffness, the thermal deformation will produce a large force on the optical system, causing the deformation of the low-temperature optical system, thus seriously affecting the imaging quality of the optical system. In this paper, a structural form of double FRP insulation ring is proposed, which can greatly improve the thermal insulation efficiency of the support structure and reduce the influence of the thermal stress on the optical system. In this paper, the design results of the structure are firstly introduced, and then steady-state thermal analysis, thermal stress analysis and mechanical analysis are carried out. The analysis results show that the structure has sufficient support stiffness, good thermal insulation efficiency and low structural thermal stress.
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