GEO离轴三反大口径空间望远镜精密热控设计与验证OA

To meet the thermal control requirements of the main structure and optical components of a large-aperture off-axis three-mirror space telescope in GEO,a thermal control scheme combining overall thermal control with precision heating at key positions is proposed.The scheme integrates passive thermal protection with multi-layer insulation(MLI),surface blackening,localized heat flux shielding,and active heating,along with 112 low-power heaters and three precision temperature controllers.Thermal analysis under typical operating conditions was conducted using thermal simulation software,and thermal balance tests were carried out in a vacuum chamber for validation.The results showed that the maximum temperature difference of the main structure was 0.4℃,with a temperature stability of less than 0.1℃over one orbital period.For the optical components,the maximum temperature difference was 0.1℃,and the temperature stability was also less than 0.1℃over one orbital period.All thermal control parameters meet or exceed the design requirements.This thermal control scheme can serve as a reference for the thermal design of similar high-precision space optical payloads.