白天工作条件下大气激光雷达探测的实验研究

Experimental Researches of Atmosphere Lidar System Working by Day

作者在已完成大气激光雷达系统夜间工作的基础上 ,对白天工作条件下的各种环境背景光的干扰进行了理论与实验分析 ,得出太阳直射光和天空光为白天工作的主要背景干扰。实验结果表明 ,经过激光发射与接收视场角严格匹配及使用干涉滤光器 (2 .6 nm和 0 .15nm)进行窄带滤波 ,背景干扰被明显地剔除 ,可进一步压低背景干扰约 2 0倍。证明采取视场匹配及干涉滤光器的措施可基本保证激光雷达系统在白天条件下工作。

Based on the finished atmosphere lidar system work by night, theoretical and experimental analysis is done in this paper as lidar system works by day with various environmental background interferes. It is found that the direct solar radiation and sky radiation are the primary background interferes. Measurement results show that background interferes are eliminated markedly via matching the laser emission and receiving field angle strictly and by using narrowband filters (2.6nm & 0.15nm). Background interfere can be depressed more than twenty times. It is proved that the lidar system can work by day when the field angle is matched and interference filters are used.