烟尘簇团粒子光学截面和散射矩阵的数值计算

用离散偶极子近似方法，计算了单个烟尘簇团粒子的光学特性，得到了簇团粒子的散射截面、吸收截面及不对称因子随入射角的变化关系，为研究波在烟尘粒子中的传输特性提供了有效的计算方法；给出了不同入射角情况下烟尘簇团粒子散射矩阵元素的角分布，为研究散射体的散射特性、极化特性以及散射体结构特性提供了一种理论方法. 关键词： 烟尘簇团粒子 散射矩阵 光学截面 DDA

Numerical calculation of optical cross section and scattering matrix for soot aggregation particles

Using the discrete-dipole approximation (DNA) method, after calculating optical characteristics of the single soot aggregation particle, we obtained the relationships of scattering cross section, absorption cross section and asymmetry parameter of soot aggregation particle with the changing incident angles, which provide an efficient approach for the research of radiative transportation of wave in soot particles. We propose the angular distribution of scattering matrix elements of soot particles at different incident angles, which provides a theoretical approach for the research of scattering characteristics, polarization characteristics, and the structural characteristics of the scatterer.