【摘要】 在激光雷达探测中，太阳光等背景光会降低探测的对比度，影响探测准确度。文章提出在雷达接收端引入轴棱锥和小孔光阑组成的光学空间滤波器抑制背景光。在激光雷达的接收端引入轴棱锥，可将空间相干的目标探测回波转换为零阶贝塞尔光束；而背景光无法转换,只能被会聚。利用小孔光阑，可在保留激光回波通过的同时遮挡部分背景光。通过仿真软件模拟该空间滤波器对背景光的作用，仿真结果表明该滤波器可提高探测的对比度；入射光口径为3mm时，在轴棱锥焦平面上放置1mm孔径小孔光阑后，对比度可提升3.5倍。更多还原

【Abstract】 In LIDAR detecting, background light such as sunlight reduces the contrast of daytime LIDAR detection and affects the effectiveness of detection. The use of an optical spatial filter consisting of an axial prismatic cone and a small aperture diaphragm to suppress the background light is proposed. By introducing an axion at the receiver end of a LIDAR, spatially coherent target detection echoes can be converted into zero-order Bessel beams, while the background light cannot be converted and only be focused. By using a small-aperture diaphragm, the background light can be partially blocked while preserving the laser echo. The effect of the filter on the background light was simulated by Zemax simulation software, which shows that the filter can reduce the background light received by the detector to suppress the background light. When the incident light diameter is 3 mm, the detection contrast can be increased by 3.5 time with a 1mm small aperture diaphragm.更多还原