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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°。
Because the existing single laser warning system can only achieve the information such as the azimuth and the wavelength of the incoming laser light, a new method of simultaneously detecting two-dimensional azimuth and wavelength information of a single laser warning system is proposed. The optical system of the method mainly includes: It is composed of a light shield, a grating, a lens group and an area array CCD. By analyzing the positions of the first and the zero-order diffracted light spots after the incoming laser passes through the grating, the two-dimensional azimuth and the wavelength of the incoming laser light are obtained. The principle of the method is illustrated through theoretical analysis. The formula of two-dimensional azimuth and wavelength is derived. The parameters of the optical element are deduced according to the requirements. The feasibility of the method is verified through experiments. The experimental results show that the wavelength resolution is less than 10 nm, the angular resolution is less than 1 °, the viewing angle in x direction is 30 °, and the viewing angle in y direction is 15 °.