摘要
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 both direction and wavelength of attacking incident laser beam, a wide-angle staring laser threat detection system based on grating diffraction is designed, analytic expressions of laser direction and wavelength are deduced, and imaging rule of the system is analyzed. The detecting ability of the system is put to test by utilizing 1064 nm pulse laser. Results show that incident laser beam is imaged to three equal-interval bright spots by this detection system, and the direction and wavelength of incident laser can be calculated based on the coordinate of middle spot and the interval of two adjacent spots. Optical aberration of fish-eye lens makes the system＇s imaging spots larger, more blurred and distort to cone with increase of incident angle of the laser beam. Half angle of vision of the designed system is 35°, and both direction and wavelength of incident laser beam can be detected effectively with the maximum detection errors of 1.5°and 60 nm, respectively.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2013年第3期172-177,共6页
Acta Optica Sinica
关键词
光学设计
激光告警
鱼眼镜头
光栅衍射
optical design
laser threat detection
fish-eye lens
grating diffraction
