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为了在大视场范围内同时探测来袭激光的方向和波长,设计了一种基于光栅衍射的广角凝视型激光告警系统,推导了入射激光方向和波长的解析表达式,分析了系统的成像特性。以1064nm脉冲激光为例,实验测试了系统对入射激光方向和波长的探测性能。结果表明,该告警系统将入射激光成像为等间隔的三个亮斑,根据中央亮斑中心坐标和相邻亮斑间距可确定入射激光的方向和波长。随激光入射角度增大,鱼眼镜头的像差使告警系统的成像光斑变大、变模糊且形状由圆形畸变为锥形;该系统的半视场角为35°,激光方向和波长的最大探测误差分别为1.5°和60nm。
In order to detect the direction and wavelength of incoming laser light simultaneously in a wide field of view, a wide angle gaze type laser warning system based on grating diffraction is designed. The analytical expression of incident laser direction and wavelength is deduced. The imaging characteristics of the system . Taking the 1064nm pulsed laser as an example, the performance of the system on the direction and wavelength of incident laser was experimentally tested. The results show that the warning system images incident laser light into three bright spots at equal intervals and determines the direction and wavelength of the incident laser light according to the coordinates of the central bright spot and the distance between adjacent bright spots. With the increase of laser incident angle, the aberration of fisheye lens enlarges the imaging spot of the alarm system and becomes blurred and its shape changes from circular to cone. The half angle of view of this system is 35 ° and the maximum of laser direction and wavelength The detection errors are 1.5 ° and 60 nm, respectively.