便携式空间外差拉曼光谱仪集成了光学功能镜头、干涉仪组件,以及探测器和激光器等热辐射器件,因此仪器在使用过程中存在着较为复杂的热环境,环境温度变化导致光学系统性能下降。采用光机热集成分析方法,重点研究了环境温度及热辐射器件对关键器件成像镜头的性能影响。在便携式空间外差拉曼光谱仪光学和结构方案设计的基础上,建立热-结构耦合模型；仿真得到成像功能镜头内镜片的间距和面形的变化,并利用Zernike多项式拟合其变化；将拟合结果代入光学设计软件中进行成像质量评估和分析。结果表明,在使用环境温度(-10℃~40℃)范围内,调制传递函数在光谱仪截止频率76.9 lp/mm处对比度均优于0.38,满足便携式空间外差拉曼光谱仪的使用要求。

The portable spatial heterodyne Raman spectrometer integrates optical lens, interferometer, and thermal radiation devices such as detector and laser. Therefore, the spectrometer has a complex thermal environment, and the change of the ambient temperature can lead to the decline of optical system performance.Aiming at this problem, the method of thermal/ structural/optical (TSO) integrated analysis was used to study the influence of ambient temperature and thermal radiation devices on the performance of imaging lens. Based on the design of the optical system and mechanical structure of the spectrometer, the thermal-structure coupling model of the lens was established, and the changes of the lens spacing and the surface shape were obtained by simulation surface change imaging lens,the Zernike polynomial was used to fit their changes. Finally, the results were coupled in the optical design software to evaluate and analyze the imaging quality. The analysis results show that, in the working ambient temperature(-10℃~40℃), the design value of the modulation transfer function (MTF) at 76.9 lp/mm is better than 0.38, which meets the requirement of the portable spatial heterodyne Raman spectrometer.