Optical system design for laser directional infrared countermeasure
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摘要: 依据机载光电武器小型化、轻量化的发展需求，设计了一套激光红外共光路光学系统。其中红外系统波段为3 μm～5 μm, F数为2，采用中波640×512 pixel的面阵探测器, 像元尺寸为15 μm×15 μm，激光发射与红外光路共用望远系统，光学系统利用立方棱镜实现方位360°和俯仰0°～90°范围的扫描，采用共光路设计可减小光路中反射镜和透镜等零件的尺寸，具有结构紧凑、质量小等特点。重点针对共光路中光学元件引入激光后向散射的问题，采用CODE V和LightTools联合优化的方法避免其影响，保证光学系统成像性能优良。Abstract: According to the development demand of miniaturization and lightweight for airborne photoelectric weapons, an infrared and laser system was designed with the common optical path. The infrared waveband of the system was 3 μm~5 μm, and the F number was 2. The surface array detector with a medium wave of 640×512 pixels was adopted, and the pixel size was 15 μm×15 μm. The laser emission and infrared optical path used the common telescopic system. By using cubic prism, the scanning in the range of azimuth 360° and pitch 0°~90° was realized by optical system. The common optical path design could reduce the size of the mirror and lens in the optical path, which had the characteristics of compact structure and small mass. It was focused on the problem of introducing the laser back scattering by the optical elements in common optical path. The joint optimization method of CODE V and LightTools was adopted to avoid its influence, which could ensure the good imaging performance of optical system.
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