基于ANSYS的红外镜筒壁厚优化设计

摘要

红外镜头往往很容易受到温度变化的影响.在红外镜头中,所有光学元件都是以镜筒为依托,镜筒的设计很大程度上决定了镜头的结构设计,并直接影响其光学性能.本文以某款红外镜头为例,运用ANSYS有限元软件的优化模块,对镜筒进行了仿真优化,通过多次迭代选出了最优解.然后通过光机热集成分析方法,运用泽尼克多项式对处理后的面形数据拟合,导入光学软件ZEMAX中进行光学性能分析,并与优化前的模型进行对比,分析结果表明,镜筒壁厚在一定程度上影响了红外镜头的光学性能,优化镜筒壁厚可以减小镜片在热环境中的面形畸变,使红外镜头的光学性能得到提高.%Infrared lens is susceptible to temperature changes. In the infrared lens, all optical elements are based on the tube and the tube design largely determines the structure design of lens, also directly affect the optical properties. In this paper, we took an infrared lens as an example, used the optimization module of ANSYS finite element software, and carried out the simulation and optimization of the tube, and then chose the optimal solution by multi-iteration. After that, through the structure-thermal-optical performance integrated analysis (STOP), using Zernike polynomials, we fit the processed surface data and analyzed the optical performance. Through the introduction of optical software ZEMAX, also, it is compared with the model before optimization. Analysis results showed: to some extent, the tube wall thickness influenced the optical performance of infrared lens. Optimization of tube wall thickness could reduce the surface distortion of lens in thermal environment, and then the optical performance of infrared lens could be improved.