大口径红外变焦投影系统环境适应性研究

Research on Environmental Adaptability of Large Diameter Infrared Zoom Projection System

对大口径变焦投影系统环境适应性进行仿真研究。影响其力学和光学性能因素主要有公路运输和环境温度,首先对整体结构进行约束模态分析,计算出系统的基频为79.781Hz,远大于二级道路运输的要求50Hz×120%,在运输过程中不会产生共振现象。利用同一模型对其温度适应性进行了研究,通过光机热集成分析方法,找到影响其成像质量的最主要因素为主次镜的曲率变化,在满足系统成像质量的前提下,得到了系统的热控指标约为20±27℃左右,远高于系统的正常工作温差,因此系统的设计是合理可行的。

For large diameter zoom projection system study on the simulation environment adaptability,highway transportation and the environment temperature were the major influencing factors,first,modal analysis was carried out on the structure,the first order of the system frequency is 79.781 Hz,greater than 50Hz×120% what is the secondary road transport,in the course of carriage will not produce the phenomenon of resonance and self motivation. Using the same model on the temperature adaptability of research by optical thermal analysis integrated methods,to find the most important factors affecting the image quality is the changes in the curvature of the Cassette primary and secondary mirror,under the premise of meeting the image quality,the system thermal control indicator is about 20±27℃,far above the normal operating temperature difference,so the design of the system is reasonable and feasible.