气溶胶激光散射信号的特征分析

Analysis of the Signals Feature Corresponding to Laser Scattering of Aerosol

本文应用Mie散射理论对微球体粒子光散射的性质进行了理论分析与数值计算,得出了散射光分布与微球体尺度参数、复折射率之间的关系。结果表明:不同尺度参数的粒子的散射光强的分布相差极大,随着尺度参数的增加散射光强越来越集中于前向;复折射率的变化对散射光强影响不大。并且在边界层大陆乡村型霾的气溶胶模型下对大气气溶胶的体角散射系数进行了分析与数值计算,得出:气溶胶粒子的散射光强主要分布在前向,并且随着散射角的增加有规律的减小。由此提出了利用气溶胶粒子体散射系数的性质,通过测量散射点前向散射光强和延迟时间来实现激光束的近轴定位的方法。

The theoretical analysis and numerical calculation of micro sphere particle light scattering characteristic are carrying out by using Mie scattering theory, moreover, the relations of the distribution of scattering light and the scale parameter of micro particle and the relative index of the micro sphere particle are presented. Results are obtained： the distributions of scattering light have great difference according to different scale parameter of micro particles; the energy of scattering light distributes in the forward area along the scale parameter increase; the variety of the relative index has little effect on the distribution of scattering light. The theoretical analysis and numerical calculation of aerosol solid angle scattering coefficient are carrying out in the borderline layer continent village haze model. Results are obtained： the energy of aerosol scattering light mainly distributes in forward area and weaken disciplinarily along scattering angle increasing. Therefore, the method of carrying out laser beam orientation close axis via measuring the energy of scattering light and the delayed time is put forward by using aerosol solid scattering coefficient feature.