基于正弦透射光栅的激光告警接收机研究

Laser warning receiver based on sinusoidal transmission grating*

在光电对抗中,高速、可靠地获取敌方来袭激光的参数是实施有效对抗的关键。提出了基于正弦振幅透射光栅衍射原理的窄脉冲激光波长和入射方向的测试方法,并设计了激光告警接收机原理样机,该样机由光栅、平凸柱面镜、ATMEL公司的驱动频率为50MHz的线阵CCD探测器、高速数字信号处理器TMS320V C5509和液晶显示电路构成。结果表明,该样机可达到如下技术指标:波长范围为500～1100nm、波长分辨率≤10nm、视场范围为22.5°、角度分辨率≤1°、反应时间<0.1s、灵敏度<10mW/cm2。

It is a key to quickly and reliably acquire the parameters of hostile attack laser in optoelectronic countermeasure. A measurement method for the wavelength and incident angle of narrow pulsed laser based on diffraction principle of sinusoidal transmission grating was proposed, and the corresponding instrument was designed,which consisted of a sinusoidal transmission amplitude grating, a planeconvex cylinder lens ,a linear CCD with 50 MHz driving frequency made by ATMEL Company, a high speed DSP TMS320VC5509 and a liquid crystal screen.The results show that the instrument meet the following technical norm：measurement wavelength range（span） is from 500 to 1 100 nm, wavelength resolution is less or equal to 10 nm, the field of view is 22.5° incident angle resolution is about 1° the responding time is less than 0.1 s, and the detecting sensitivity is less than 10 mW/cm^2,