摘要
尽管非球形下一些特殊形状颗粒的单散射已被得到,球形多颗粒系(颗粒群)的多重散射也被研究,但至今仍未得到非球形颗粒群的多重散射.文中建立了一类椭圆截面非球形颗粒模型,求得其散射相位函数,借助于辐射传播方程,考虑形状及大小分布,得到了该类颗粒群的多重光散射.在两种特例情况下的结果能与已有的结果符合较好,说明了方法的可靠性.计算分析表明:非球形颗粒群的多重散射光强角分布要比球形颗粒平坦.椭圆截面颗粒的粒度或形状参数越大,多重散射光越集中于小的散射角;粒度分布或形状分布越宽,多重散射光强的角分布越平坦.随着光学厚度增加,多重散射光强的角分布变平坦,而在某散射角的光强增加到一定程度后将会减小.研究结果不仅使多重散射向非球形颗粒领域拓展,同时也具有实际指导价值.
A model for a kind of non-spherical particles with elliptical cross section is established, and their phase functions are obtained. Based on the radiative-transfer equation, considering the shape and size distribution, we obtain the multiple light scattering of this kind of particles. Our results are in agreement with the earlier results in two special cases, which verifies that our method is reliable. The calculation and analysis show that the distribution of multiple scattered intensities of non-spherical particles is flatter than that of the spherical particles. The larger the shape parameter or the size of particles is, the smaller the scattering angle is. The wider the size-distribution or shape-distribution is, the flatter the angular distribution of the light intensity is. The angular distribution of the light intensity becomes flatter with the increasing optical thickness. The multiple scattering intensity at a scattering angle at first increases and then decreases with the increasing optical thickness. A new potential way of studying the multiple light scattering of actual non-spherical particles is provided.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2009年第6期3864-3869,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:50602044)
江苏省高校自然科学基金重大基础研究项目(批准号:08KJA510002)资助的课题~~
关键词
多重光散射
颗粒
非球形
椭圆截面
multiple light scattering, particles, non-spheroid, elliptical cross section
