摘要
基于分形理论,采用团簇—团簇凝聚模型对随机分布烟尘团簇粒子的分形结构进行了模拟.利用离散偶极子近似方法研究了不同类型的随机分布烟尘团簇粒子的单次散射特性.利用蒙特卡罗方法研究了激光信号在随机分布烟尘团簇粒子中的传输衰减特性.讨论了入射角、激光波长、烟尘粒子数密度以及组成单个烟尘团簇粒子的原始微粒粒径和数目等参量对激光衰减特性的影响.研究结果对激光在复杂随机介质中的传输衰减特性分析提供了理论依据.
Based on fractal theory, the cluster cluster aggregation （CCA） model is used to simulate the fractal structure of the soot agglomerates with random distribution,and the properties of single scattering of randomly distributed soot agglomerates are studied using the discrete dipole approximation （DDA） method. Then the laser attenuation characteristics in the randomly distributed soot cluster agglomerates are studied using Monto Carlo method. The effects of the incident angle, laser wavelength, number concentration,the number and diameter of primary particles in soot agglomerates on the attenuation properties of laser are discussed. The research result provides theoretical basis to the propagation and attenuation characteristics of laser in the complex random medium.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2010年第6期1021-1025,共5页
Acta Photonica Sinica
基金
国家自然科学基金(60371020)资助
关键词
烟尘团簇粒子
离散偶极子近似方法
蒙特卡罗方法
衰减特性
Soot agglomerates
Discrete dipole approximation method
Monto Carlo method
Attenuation characteristics
