Light Scattering by Ice Crystals: Theory and Experiment

9315251 Liou 这项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。 所提出的理论研究包括将新开发的几何射线追踪/蒙特卡罗方法应用于复杂的冰晶，如盖柱、空间聚集体和霰石。 对于尺寸参数小于约 30 的冰晶，我们建议开发一种数值技术，称为时域有限差分法，用于求解散射场。 拟议的实验室实验使用激光光散射模拟测量单晶。 介绍了最初的实验安排和初步结果，并概述了测量各种形状和尺寸晶体的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. ***