基于热光学分析的真空相机光学镜设计

Design of Corrector Mirror of Vacuum Camera Based on Thermal-Optical Analysis

以热光学分析为基础,对复杂环境下改正镜作为光学窗口的玻璃厚度进行了优化设计。对改正镜的强度及其所处的热环境进行了分析,将温度场映射到结构模型中,利用有限元计算改正镜在热-力耦合情况下的改正镜的变形量和面形数据,对正镜面形数据进行拟合和处理,最后将处理后的改正镜面形数据导入光学设计方案中,分析改正镜厚度对光谱仪性能影响。结果表明改正镜厚度应该不小于10mm;当改正镜厚度为15mm时,改正镜受热力学影响可以忽略。因此改正镜作为光学窗口既能满足强度和可靠性要求,又能满足光谱仪性能指标,为窗口的设计提供了依据。

Based on the thermal-optical analysis, the glass thickness of the corrector mirror used as an optical window is optimized under the complex environment. The intensity and the thermal environment of the corrector mirror is analyzed. By mapping the temperature field to structural model, the deformation and surface data of the corrector mirror under the thermal-force coupling condition are calculated by the finite element method. The surface data of corrector mirror is fitted and calculated. Finally, the processed surface data of corrector mirror is brought into the optical design scheme, and the effect of the thickness of corrector mirror on the performance of spectrometer is analyzed. The results show that the thickness of the corrector mirror should be no less than 10 mm. If the thickness of the corrector mirror is 15 mm, the effect of thermodynamics on eorrector mirror can be ignored. It is conclused that the corrector mirror acting as optical window can not only meet the strength and reliability requirements, but also meet the optic index of the spectrometer. These results provide the guidance for the optical window design.