用于偏振云粒子探测系统的典型非球形粒子散射特性模拟

储晨曦; 卜令兵; 杨巨鑫

doi:doi:10.13883/j.issn1004-5929.201802014

光散射学报, 2018, 30 (2): 174, 网络出版: 2018-08-04

用于偏振云粒子探测系统的典型非球形粒子散射特性模拟

Simulation of Scattering Characteristics of Typical Nonspherical Particles for Cloud Particle Detection System with Polarization Detection

论文大纲

储晨曦 ^*卜令兵杨巨鑫

作者单位

南京信息工程大学气象灾害预警与评估协同创新中心,中国气象局气溶胶-云-降水重点实验室,教育部气象灾害重点实验室,南京 210044

T矩阵云粒子探测偏振激光探测非球形粒子光散射 T-Matrix cloud detection polarized laser nonspherical particle light scattering

摘要

为进一步了解云物理过程,探测冰云及混合相云云粒子特性,提出了一种带有偏振通道的云粒子探测器模型,可以同时探测前向散射和后向散射一定立体角内的散射能量和退偏比。模拟了椭球,圆柱和球形粒子的相函数,不同角度的退偏比,总散射截面,发现球形粒子几乎不产生退偏,其退偏与椭球、圆柱粒子退偏有数个量级的差距,探测时可以直接以退偏分辨球形粒子。计算了在探测器前后两个接收立体角内非球形粒子的散射截面和退偏比均值,粒子退偏比和散射截面随粒子的横纵比变化比较连续,一定条件下可以分辨部分粒子的形状。粒子退偏比随粒子的等效半径变化波动,不利于探测时分辨粒子大小。在模拟的粒径范围内,粒子等效半径和散射截面大致成正相关,探测时可以以此分辨粒子大小。粒子散射模拟结果表明,该探测系统除可以进行球形粒子探测能力外,具有一定的非球形粒子探测能力。

Abstract

In order to detect characteristics of ice cloud and mixed phase cloud and further understand the process of cloud physics,a cloud particle detector with polarization channel which can simultaneously detect the depolarization ratio of backscattering and the scattering energies of forward scattering is presented in a fixed solid angle.The phase function,depolarization ratio of different angles,total scattering cross section of the ellipsoid,cylindrical and spherical particles has been simulated.We found that spherical particles have almost no depolarization,and the depolarization ratios of ellipsoid,cylindrical particles are several magnitude larger,so the spherical particles can be distinguished from nonspherical particles by depolarization ratios.The mean depolarization ratio and particle scattering cross section of nonspherical particle at the two receiving solid angles has been caculated,depolarization ratio and particle scattering cross section varies with aspect ratio smoothly,which makes the distinguishment between particles with different aspect ratio more directly.Particle depolarization ratio changes with the equivalent radius of the particle fluctuately,which goes against the detection.The equivalent particle radii and the scattering cross section are generally in positive correlation,so the particle size can be detected by their scattering cross sections.The simulation results shows that the detection system has the ability to detect nonspherical particles in addition to the ability for spherical particles detection.

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储晨曦, 卜令兵, 杨巨鑫. 用于偏振云粒子探测系统的典型非球形粒子散射特性模拟[J]. 光散射学报, 2018, 30(2): 174. CHU Chenxi, BU Lingbing, YANG Juxin. Simulation of Scattering Characteristics of Typical Nonspherical Particles for Cloud Particle Detection System with Polarization Detection[J]. The Journal of Light Scattering, 2018, 30(2): 174.

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