超高声速飞行器光学窗口气动光学效应分析

超高声速飞行器在大气中飞行时,由于气动热和气动力的作用,光学窗口会产生严重的气动光学效应,使目标图像发生像偏移、抖动、模糊和能量衰减。利用有限元分析方法对光学窗口的热光效应、弹光效应和窗口热变形进行研究,计算了由热光学效应、光学窗口热变形引起的点扩散函数峰值大小及峰值位置(像偏移)随时间的变化趋势。根据对温度场的分布分析,计算了温度梯度对透过率的影响以及透过率与窗口热辐射随时间变化的趋势,可为光学窗口的设计、材料的选择及后期的图像处理提供依据。

Study on aero-optical effects of hypersonic vehicle's optical window

The serious aero-optical effects can be generated by the aerodynamic heating and aerodynamic effect when a hypersonic vehicle is flying in the air,which makes the target image departure,flutter,fuzzy and energy's attenuation. The thermo-optic effect,the elasto-optical effect and the thermal deformation of the optical window are studied by finite element analysis method. The time variation of peak and peak location of the point spread function is analysed. The transmissivity that is affected by the temperature gradient and the time variation of the the window's thermal radiation are studied according to the temperature distribution. The studies provide the basis for the optical window design,material selection and the later image processing.