不同风速下侧向散射激光雷达的回波信号分析

对不同风速条件下,CCD侧向散射激光雷达的回波信号进行了分析.根据Mie散射原理及侧向散射激光雷达工作原理,确定了大气气溶胶浓度与激光雷达侧向散射光强的相关性;进一步考虑气溶胶浓度与风速的关联,利用实验装置获取了激光雷达侧向散射光强与风速的关系,分析了不同风速条件下侧向散射激光雷达的回波信号.在轴流风机以及自然风两种条件下进行对比实验发现,当风速范围在1~4.5 m/s时,侧向散射光强随风速的增加而增加;当风速范围在4.5~6.0 m/s时,光强随风速的增加较少.对实验结果归一化处理,得到风速范围在1~4.5 m/s时,风速每增加1 m/s,侧向散射光强在轴流风机及自然风的实验条件下分别增加了3.7%和3.9%;风速范围在4.5~6.0 m/s时,风速每增加1 m/s,侧向散射光强分别减少了3.1%和3.8%,在自然风况的各个风向上都基本符合这一变化趋势.

Echo Signals Analysis of Side-scattering LiDAR under Different Wind Speed Conditions

The echo signals of the CCD side-scattering lidar under different wind speed conditions were analyzed.According to Mie scattering theory and CCD side-scattering LiDAR principle,the correlation between aerosol concentration and its side-scattering light intensity is determined.By considering the relationship between aerosol concentration and wind speed,the echo signals of side scatter lidar under different wind speed conditions are analyzed.By comparing the experiments under two conditions of axial fan wind and natural wind,it can be found that when the wind speed is in the range of 1~4.5 m/s,the aerosol concentration increases with the increasing of wind speed;otherwise when the wind speed is in the range of 4.5~6 m/s,the aerosol concentration decreases with the increasing of wind speed.Normalizing the results,conclusions are drawn that when the wind speed are in the range of 1~4.5 m/s,the side-scattering light intensity increase by 3.7%and 3.9%with the wind speeds increase by 1 m/s in the conditions of axial fan and natural wind.When the wind speedsare in the range of 4.5~6.0 m/s,the light intensity decreased by 3.1%and 3.8%with wind speeds increases by 1 m/s in the two conditions,and the trend exists in all wind coming directions of natural wind.