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当激光入射到正弦光栅时,会产生0级和±1级衍射谱线,通过测量衍射谱线的分布,可获得入射激光的波长及方位角信息。为了实时探测激光光源的波长和方位角,设计了一种基于正弦光栅的凝视型激光探测告警系统。介绍了系统的工作原理,推导了激光波长和方位角的计算公式,并对系统的探测精度进行了数值模拟研究。分析了光栅常数和柱面镜曲率半径对系统探测能力的影响,并且给出了相关函数。实验结果表明:当光栅常数为1/500mm、柱面镜曲率半径为20mm时,系统可实现对波长为320～1100nm、视场角为±20°范围内激光源的实时探测,波长分辨率可达到10nm,角分辨率可达到1°。
When the laser beam is incident on a sinusoidal grating, the 0th and 1st order diffraction lines are generated. By measuring the distribution of the diffraction lines, the wavelength and the azimuth angle of the incident laser beam can be obtained. In order to detect the wavelength and azimuth of laser light source in real time, a gaze-type laser detection and warning system based on sinusoidal grating was designed. The working principle of the system is introduced. The formula of laser wavelength and azimuth angle is deduced. The numerical simulation of the detection accuracy of the system is carried out. The influence of the grating constant and the radius of curvature of the cylindrical mirror on the detection ability of the system is analyzed, and the correlation function is given. The experimental results show that the real-time detection of the laser source with wavelength of 320 ~ 1100nm and field angle of ± 20 ° can be achieved when the grating constant is 1 / 500mm and the radius of curvature of the cylindrical mirror is 20mm. The wavelength resolution Up to 10nm, the angular resolution can reach 1 °.