激光雷达白天探测大气边界层气溶胶

介绍了自行研制可用于白天探测大气气溶胶的AML-1激光雷达系统，分析了白天工作条件下激光雷达的各种噪声干扰，并给出了抑制噪声干扰的有效措施.其中，天空背景辐射噪声是激光雷达白天工作的主要干扰，通过接收视场角与激光束发散角的严格匹配以及采用高光谱透过率超窄带滤光片可大大抑制天空背景光的干扰.最后，给出了AML-1激光雷达白天测量大气边界层气溶胶的典型结果.关键词：大气光学激光雷达气溶胶边界层

A lidar system for monitoring planetary boundary layer aerosol in daytime

Lidar is a powerful tool for atmospheric monitoring. However, most lidars operate only in nighttime due to the interference of strong background skylight in daytime. We have developed the AML-1 lidar system, which can measure aerosol profiles in daytime also. In this paper, the structure and specifications of the lidar system are described. Various noise sources of the lidar and methods for rejecting these noises are discussed. It has been found that among these noises the sky radiation is the main background noise for daytime working lidars. This noise can be effectively eliminated by incorporating small divergence-angel of emitting laser beam, narrow-field-of-view receiver, and narrow-band filter with high transmittance. Some daytime boundary layer aerosol profiles measured by the AML-1 are presented.