大气中球形粒子的散射特性研究

从Mie理论出发，得到了不同尺度的球形粒子对激光的散射图像及粒子的消光效率曲线。从得到的散射图像可以看出，随着粒子尺度的逐渐增大，散射光强越来越集中到前向散射方向，并且散射光强集中的角度越来越窄。从消光效率曲线可以看出，随着粒子尺度的增加，消光效率因子变化趋于平缓，并逐渐趋向于常数2。最后分析了散射光的偏振度对粒子尺度和散射角的变化关系。从散射光的偏振度随粒子尺度变化图可以看出，粒子散射光的偏振度随粒子尺度的增大而增加，且变化比较明显，而散射光偏振度大小的峰值逐渐趋向于前向方向，随着粒子尺度的增大，散射光偏振度趋于减小。

Study of Scattering Property of Spherical Particle in Atmosphere

Based on Mie theory, the scattering figure and extinction curve of spherical particles with different sizes are presented. The scattering figure of a spherical particle shows that the scattering angle becomes narrow as the size of a partical increases gradually. From these extinction curves, we can see as the size of particles increases, the extinction efficiency factor tends to 2. Finally, the variation of polarization degree of scattering laser with particle size and scattering angle. Theses figures about polarization degrees versus the size of particles show taht as the size of the partcle increases, the peak of polarization degree extends forward, but the polarization degree decreases.