红外镜头的热光学特性分析

考虑环境温度是红外光学系统成像质量的主要影响,需要对红外镜头进行热光学特性分析。阐述了利用齐次坐标变换去除镜面刚体位移的方法,以某红外镜头为例,用有限元软件ANSYS对红外镜头进行热应力分析,并去除镜面产生的刚体位移；对处理后的面形数据进行Zernike多项式拟合,将拟合后的结果代入ZEMAX进行光学性能分析。分析结果表明,热光学分析的方法可以模拟红外光学系统的实际使用条件,预测光机系统的光学性能,对进行光机系统设计具有重要的指导意义。

Analysis of the thermal optical properties of infrared lens

Environment temperature is the key influence factor for the infrared optical system,so it is necessary to analyze the thermal optical properties of infrared lens.The method based on homogeneous transformation is used to remove the rigid-body displacement.Taking the infrared lens as example,the thermal stress of infrared lens is analyzed by ANSYS software,and the rigid-body displacement of lens is removed.The Zernike polynomial is used to fit the data of mirror surface,and then the fitted results is exported to optical design software ZEMAX for the analysis of optical performance.The results show that the actual service conditions of infrared optical system can be simulated by the method of thermal optical analysis,and the optical performance of this system can be predicted,which has an important guiding significance for the design of opto-mechanical system.