基于Mie散射激光雷达的气溶胶消光系数反演方法

Mie散射激光雷达在探测气溶胶光学特性方面应用极其广泛,但在确定气溶胶消光系数边界值、后向散射消光对数比等方面缺乏精准性。基于Klett后向积分模型,提出了一种利用Mie散射激光雷达反演气溶胶消光系数的方法。首先,通过构建非线性方程,利用Steffensen迭代法获得气溶胶消光系数边界值。其次,借助差分吸收激光雷达函数模型推导气溶胶后向散射消光对数比。最后,引入反馈系统,不断修正边界值,减小气溶胶消光系数反演的误差。实验结果表明,该算法能够更快速地获取消光系数边界值并反演出高精度的气溶胶消光系数,平均相对误差低于10 %,在气溶胶探测中应具有广阔的应用前景。

An aerosol extinction coefficient inversion method based on Mie-scattering lidar

Mie-scattering lidar has been widely used in the detection of aerosol optical properties.However,this technology lacks accuracy in the determination of aerosol extinction coefficient boundary value and the logarithmic ratio of backscattering extinction.Based on the Klett backward integration model,a novel method for retrieving aerosol extinction coefficient is proposed.Firstly,by constructing a nonlinear equation,the boundary value of aerosol extinction coefficient is obtained by Steffensen iterative method.Secondly,the logarithm ratio of aerosol backscattering extinction is deduced by using differential absorption lidar function model.Finally,a feedback system is introduced to continuously correct the boundary value and reduce the error of the aerosol extinction coefficient inversion.The experimental results show that this algorithm can obtain the boundary value more quickly and invert the high-precision aerosol extinction coefficient,and the average relative error is less than 10 %,which should have broad application prospects in the aerosol detection.