光机热集成仿真在光学系统无热化设计中的应用研究

Application of Structural-Thermal-Optical Integration Simulation in Optical System Athermalization Design

温度变化时,光学镜片参数的变化使得光学系统产生离焦,无热化设计就是为了补偿温度变化的影响,使得像面与探测器位置相匹配。常规的无热化设计主要考虑了温度对折射率的影响,而对于光机结构变形对光学元件位置、角偏、面型造成的影响考虑不足。完整分析了温度对光学系统的影响,较为全面地考虑了光学、结构的热效应,研究了基于光机热集成仿真技术的光学系统无热化设计方法,以一个卡式光学系统的被动无热化设计为例说明了该方法的有效性。

The parameter changes of optical lens caused by temperature changes may result in defocusing of the optical system,and the purpose of athermalization design is to compensate for the influence of temperature changes,and match the detector with the image plane.Normal athermalization design methods mainly study the influence of temperature on refractive index,and the change of position,angle and surface of the optical elements due to structural deformation is not taken into full consideration.A detailed analysis is made to the influence of temperature on optical system in consideration of structural-thermal-optical effects.Then,an optical athermalization design method based on structural-thermal-optical integration simulation is studied,and the effectiveness of this method is verified by a passive athermalization design of Cassegrain optical system.