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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。
With the rapid development of photoelectric sensing technology, the requirements for infrared interference technology are also getting higher and higher. Conventional systems are unable to meet the new requirements of high energy concentration and good concealment. For this reason, a design scheme of off-axis dual-reflection laser beam expander system is proposed, and the main components of the system including off-axis dual reflection mirror group, plane reflection mirror and fixed support structure are designed and analyzed in detail . In order to reduce the size of the system, a new planar mirror support structure is adopted. In order to reduce the mirror deformation, the micro-stress fixed design is adopted for the off-axis dual reflection mirror and the plane reflection mirror. The simulation results show that the first-order natural frequency of the system is 45.68 Hz, and the stress of the fixed support structure is far less than the yield strength of the material. The test results show that the error of two axes of the system is less than or equal to 0.3 mrad, and the ratio of beam expander and beam expander can reach 1: 12.01, meeting the design requirements.