二维激光告警光学系统设计

Design of two-dimensional laser warning optical system

由于现有单激光告警系统只能实现来袭激光一维的方位和波长等信息,提出了一种单激光告警系统同时测得二维方位信息和波长信息的新方法,该方法的光学系统主要由遮光罩、光栅、透镜组和面阵CCD组成,通过对来袭激光经过光栅后的一级和零级衍射光斑位置的判决,得到来袭激光二维方位和波长信息。通过理论分析说明了该方法的原理,并推导得出二维方位角和波长的测量公式,根据要求推导确定了光学元件参数,并通过实验验证了其可行性。实验结果显示波长分辨率小于10 nm,角度分辨率小于1°,x方向视场角为30°,y方向视场角为15°。

As an existing single laser warning system can only achieve a one-dimensional azimuth and wavelength information of the incoming laser light. A new method of single-laser warning system was proposed which can simultaneously measure two-dimensional azimuth and the wavelength information of the incoming laser light. The optical system consists of shade, grating, lens group and CCD array. Twodimensional azimuth and wavelength information of the incoming laser light was measured by measuring the position of the zero-order and first-order diffraction. The basic principle was introduced, the equations of two-dimensional azimuth and wavelength measurement formula was derived. Depending on the project requirements, optical component parameters were deduced. The feasibility was verified through experiment.The experimental results show that the laser waring device can realize measurements of the incoming laser light, azimuth resolution no more than 1°, x direction field of view of 30°, y direction field of view of 15°.