户外型探测臭氧和气溶胶激光雷达系统研制

激光雷达探测臭氧和气溶胶垂直廓线分布近年来在环境监测领域获得广泛应用。介绍了一套可同时用于探测臭氧和气溶胶浓度的激光雷达系统。采用Nd:YAG激光器，通过二倍频器和四倍频器分别产生532 nm和266 nm激光光源，基于受激拉曼散射原理，在两根拉曼管中分别充有氘气和氢气，产生拉曼频移光289 nm，299 nm，通过差分吸收算法原理反演垂直空间臭氧浓度廓线，通过米散射算法原理来反演气溶胶浓度廓线。水平扫描试验结果显示，雷达系统的探测结果与近地面点式臭氧分析仪测量结果有较好的一致性，相对误差小于10%。在安徽合肥科学岛外场观测结果表明:臭氧探测高度，白天可以达到3 km，晚上可以达到5 km，气溶胶探测高度，白天可以达到10 km，晚上可以达到15 km。

Outdoor lidar system for measurement of ozone and aerosol profiles

Lidars to observe ozone and aerosol vertical profile are widely used in environment monitor area recently. A new lidar system with both functions was introduced. The 532 nm and 266 nm light beam were generated separately with second and fourth harmonic generators using Nd:YAG laser oscillator. The 289 nm and 299 nm Raman spectrums were obtained using two Raman cells based on the theory of stimulated Raman scattering, in which one was pumped with deuterium and another was pumped with hydrogen. The ozone concentration profile was retrieved by DIAL algorithm while the aerosol concentration profile was retrieved by Mie scattering algorithm. The lidar detection results agree well with that of ozone analyzer according to the horizontal scanning experiment where the maximum relative error is less than 10%. Results observed on the science island in Hefei City, Anhui province show that the detection height is 3 km in daytime and 5 km in night time for ozone while the height is 10 km in daytime and 15 km in night time for aerosol.