一 种 激 光 雷 达 轴 棱 锥 光 学 空 间 滤 波 器

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.