The traditional infrared lens would produce different defocus amounts because of temperature difference,which lead to the decline of the imaging quality.To solve this problem,the thermal optical properties of a mechanical passive athermal infrared lens were analyzed.Firstly,the finite element model was established by ANSYS,and then the least square method was used to obtain rigid body displacement through the change of homogeneous coordinates.After that,the shape change was gotten by Fringe Zernike polynomial fitting.Finally,the interface program was written based on the Schmidt's orthogonalization on the MATLAB platform,and 37 Fringe Zernike coefficients were imported into Zemax for analysis.The results show that:at high or low temperature,the axial defocus of the lens was compensated well,due to the role of compensation group.The imaging quality of the lens at a low temperature was slightly worse than that at a high temperature.In a word,the overall imaging quality of the lens is improved and meets the requirements.
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朱峰,张宇,陈骥,李洪兵,贾钰超.消热差红外镜头热光学特性分析[J].激光与红外,2017,47(10):1299~1304 ZHU Feng, ZHANG Yu, CHEN Ji, LI Hong-bing, JIA Yu-chao. Analysis of thermal optical properties for athermal infrared lens[J]. LASER & INFRARED,2017,47(10):1299~1304