Light Scattering by Ice Crystals: Theory and Experiment

9315251 Liou本研究的目的是利用理论和实验方法开发非球形冰晶的光散射程序。提出的理论研究包括新发展的几何光线追踪/蒙特卡罗方法应用于复杂冰晶，如帽柱、空间聚集体和霰。对于尺寸参数小于30的冰晶，我们提出了一种求解散射场的数值技术，即时域有限差分法。提出的实验室实验采用激光光散射模拟测量单晶。提出了初步的实验安排和初步结果，并概述了测量不同形状和尺寸晶体相矩阵元素的拟议实验。＊＊＊

9315251 Liou The objective of this research is the development of light scattering programs for nonspherical ice crystals using both the theoretical and experimental approaches. The proposed theoretical studies include the application of the newly developed geometric ray-tracing/Monte Carlo method applied to complex ice crystals such as capped columns, spatial aggregates, and graupel. For ice crystals with size parameters less than about 30, we propose to develop a numerical technique, referred to as the finite difference time domain method, for the solution of the scattered field. The proposed laboratory experiment uses a laser light-scattering analog measurement for a single crystal. Initial experimental arrangements and preliminary results are presented and the proposed experiments for the measurements of the phase matrix elements for crystals of various shapes and sizes are outlined. ***