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设计了一种基于迈克耳孙干涉仪的凝视型激光告警系统,理论分析了系统定向精度和滤光片透射率的变化规律。结果表明,入射激光经过告警系统后,形成环形干涉条纹,根据条纹中心的坐标和条纹间隔可解算入射激光的方向和波长;在探测器像元尺寸固定的情况下,系统的定向精度由光束变换透镜和球面反射镜焦距的比值决定,定向精度随该比值的减小而提高;告警系统滤光片的透射率取决于变换透镜的焦距,当变换透镜焦距为鱼眼镜头焦距10倍时,滤光片对系统入射角为0°~90°范围内激光的透射率为90.0%~87.5%,这保证了系统对各角度的入射激光都有较高的探测灵敏度。
A gaze-type laser warning system based on Michelson interferometer was designed. The variation regularity of the system and the transmittance of the filter were theoretically analyzed. The results show that the incident laser beam forms a ring-shaped interference fringe after passing through the alarm system, and the direction and wavelength of the incident laser light can be calculated according to the coordinates and fringe spacing of the fringe center. When the size of the detector cell is fixed, The conversion lens and the spherical mirror focal length ratio of the decision, the orientation accuracy decreases with the ratio increases; alarm system filter transmittance depends on the conversion lens focal length, when the conversion lens focal length fisheye lens focal length 10 times, The transmittance of the filter to the system at an incident angle of 0 ° to 90 ° is 90.0% to 87.5%, which ensures that the system has a high detection sensitivity for incident laser light at all angles.