一种轻质薄型反射镜的挠性支撑结构设计

宽厚比较大的小型轻质薄型反射镜在宽温度范围及恶劣的环境(尤其是低温-40℃)下易发生变形，严重影响系统成像质量。针对这种情况，以挠性支撑原理为基础，借助于热力学理论设计了一种适用于小型轻质薄型分光反射镜的新型挠性支撑结构，采用有限元技术，对该挠性支撑结构的温度适应性进行了分析，并对装配后的反射镜组件进行了低温试验。试验结果表明:在-40℃温度下，反射镜面形精度峰谷值(PV值)保持在0.25λ(λ＝632.8 nm)，这种新型挠性支撑结构能够满足应用环境的使用要求。

Flexible support structure design of lightweight thin reflector

The shape of optical lightweight thin reflector possessing large flakiness ratio is always effected by wide-range temperature and harsh environment(especially at -40℃), seriously influencing the system image quality. Aiming at this problem, based on flexible support principle and thermodynamics theory, a new support structure was designed for small lightweight thin splitting reflector. The temperature adaptability of the support structure was analyzed by using finite element method, and the low temperature tests for assembled mirror components were conducted. The result shows that the accuracy of reflector surface figure remains 0.25λ(λ＝632.8 nm, peak-to-valley)at -40℃. These results demonstrate that the novel flexible supporting structure design satisfies the application environment requirements.