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激光雷达为了探测更高大气层段的回波信息,通常采用大功率激光器发射和大口径望远镜接收来增加回波信号强度,然而会带来低空强散射回波信号光饱和的问题。机械斩波方式从光学上巧妙地完全阻断了低空杂散光,而让高空回波光全部通过,有效提高了激光雷达高空探测能力。对斩波器原理进行理论分析,并组建了一套斩波单元。经测试,测试结果与理论计算符合得很好。将此斩波单元直接运用于高空探测激光雷达之中,实现了对低空强散射光的有效隔离,解决了光电探测器在低空大气层段探测的饱和甚至致盲问题,有利于提高激光雷达的探测高度和精度。
In order to detect the echo information in the upper atmosphere, Lidar usually uses high-power laser emission and large-aperture telescope to increase the echo signal intensity, however, it will bring about the light saturation of low-level strong scattering echo signal. Mechanical chopping mode cleverly completely block the low-level stray light from the optical, and let all the high altitude echo light, effectively improving the lidar’s altitude detection capability. Theoretical analysis of the chopper principle, and set up a set of chopper unit. Tested, the test results and theoretical calculations in good agreement. The chopper unit is directly applied to the high-altitude exploration lidar to achieve the effective isolation of low-level strong scattered light to solve the photodetector in the low-level atmospheric exploration of saturation or blindness problems, help to improve the detection of lidar Height and accuracy.