随机取向烟尘团簇粒子的光学截面的数值计算

采用蒙特卡罗方法根据团簇—团簇凝聚（CCA）模型对由球形原始微粒凝聚而成的烟尘团簇粒子进行了模拟，利用离散偶极子近似（DDA）方法数值计算了不同原始微粒粒径和数目组成的随机取向的烟尘团簇粒子的总消光截面、吸收截面及散射截面等光学特性参数，研究了原始微粒粒径及数目对随机取向烟尘团簇粒子光学特性的影响。结果表明：当入射波长一定时，随机取向烟尘団簇粒子的光学特性主要取决于原始微粒的粒径和数目；烟尘团簇粒子对不同波段激光的吸收和散射存在差别，这种差别随原始微粒粒径及数目变化而变化。这一工作为研究电磁波在烟尘中的传输特性提供重要参考数据。

Numerical calculation of optical cross sections of randomly oriented soot clustered agglomerates

Cluster-cluster aggregation (CCA) model by using Monte Carlo method was used to simulate the structure of the soot clustered agglomerates consisting of spherical primary particles, and the optical properties of randomly oriented soot clustered agglomerates ,such as the extinction cross section, absorption cross section, scattering cross section, were calculated with different number and different diameter between the spherical primary particles by using the discrete dipole approximation (DDA) method. The results showed that the optical properties of randomly oriented soot clustered agglomerates are determined by the diameter and number of primary particles besides the incident wavelength; there exists many discrepancies between the absorption and scattering of different laser wavelengths by randomly oriented soot clustered agglomerates.This work will provide significant reference data for the research of propagation property of electromagnetic wave in soot.