Light Scattering by Ice Crystals: Theory and Experiment

小行星9315251 本研究的目的是利用理论和实验方法发展非球形冰晶的光散射程序。 建议的理论研究包括应用新开发的几何射线追踪/蒙特卡罗方法适用于复杂的冰晶，如加盖柱，空间聚集体，和<$。 对于冰晶的尺寸参数小于约30，我们建议开发一种数值技术，称为时域有限差分法，散射场的解决方案。 拟议的实验室实验使用激光散射模拟测量单晶。 初步的实验安排和初步结果，并提出了建议的实验测量的相位矩阵元素的各种形状和尺寸的晶体进行了概述。 ***

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. ***