扩束系统设计与分析

随着光电传感技术的快速发展,对于红外干扰技术的要求也越来越高,常规系统已经无法满足能量高度集中、隐蔽性好的新要求.基于此原因,提出了一种离轴双反射式激光干扰扩束系统的设计方案,并对系统主要部件包括离轴双反射式镜组、平面反射镜及固定支撑结构进行了详细的设计与分析.为了缩小系统尺寸,采用了一种新的平面反射镜支撑结构;为减小镜面变形,离轴双反射式镜组及平面反射镜均采用微应力固定设计.仿真实验结果显示,系统一阶固有频率为45.68 Hz,其固定支撑结构应力远小于材料屈服强度.测试结果表明,系统的两轴一致性误差小于等于0.3 mrad,并可以实现1:12.01的扩束比,满足设计指标要求.

Design and analysis of beam expanding system

With the rapid development of photoelectric sensor technology, the infrared interference technology is required higher. Routine system can not be satisfied with the new demands of energy concentration and good concealment. Based on these reasons, this paper put forward a design scheme regarding of an off-axis double reflector type of laser jamming applied at beam expanding system. It designed and analyzed the optical-mechanical structure of such key parts as the components of off-axis double reflectors, the turning plane reflector and supporting and fixing mechanisms. A special structure design of turning plane reflector was adopted with a view to decreasing the size of the system; the design of micro-stress was adopted for components of both the main and secondary reflectors and the turning plane reflector. Simulation results showed that the first order natural frequency was 46.85 Hz, and stress responses of the structure was also far less than yield limit of the material. After the actual detection, the consistency of two axes was below or equal to 0.3 mrad and the beam expanding ratio obtained was 1:12.01, meeting the requirement of designed technical index.