不同空间取向角椭球颗粒电磁散射特性的Rayleigh解  

Rayleigh solutions for electromagnetic scattering of ellipsoidal particles with different orientation angles

作　　者：王娟 李兴财[2] 程宁[3] WANG Juan;LI Xing-cai;CHENG Ning(Xinhua College,Ningxia University,Yinchuan 750021,China;School of Physics,Ningxia University,Yinchuan 750021,China;Key Laboratory of Disaster and Environmental Mechanics in Western China with the Ministry of Education,College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]宁夏大学新华学院,银川750021 [2]宁夏大学物理学院,银川750021 [3]兰州大学土木工程与力学学院,西部灾害与环境力学教育部重点实验室,兰州730000

出　　处：《兰州大学学报（自然科学版）》2024年第6期711-717,共7页Journal of Lanzhou University(Natural Sciences)

基　　金：宁夏回族自治区教育厅高等学校科学研究项目(NYG2024212);国家自然科学基金项目(12064034,11562017);宁夏回族自治区自然科学基金项目(2022AAC03643);宁夏科技创新领军人才项目(2020GKLRLX08)。

摘　　要：建立用Rayleigh近似求解不同空间取向角椭球颗粒电磁散射性质的新方法.结果表明,空间取向角对椭球颗粒的电磁散射特性有非常重要的影响.与等体积球体相比,在颗粒取向角的极角分量处于部分角度时椭球颗粒的散射效率、吸收效率增加25%;在某些情况下散射效率、吸收效率显著减小,特别在极角为90°时减小20%.随着轴比的增加,旋转椭球体与其等体积球体的散射效率和吸收效率的比值呈指数减小趋势,但部分极角下呈线性增加趋势.通过对比颗粒取向角呈均匀分布与正态分布时椭球颗粒系统的吸收系数变化,揭示颗粒取向角分布函数在相关计算中的意义.Using the Rayleigh approximation,we proposed a novel approach to solve the electromagnetic scattering properties of ellipsoidal particles with varying spatial orientation angles.The results showed that the spatial orientation angle had a significant impact on the electromagnetic scattering characteristics of spheroids.When the polar angle component of the orientation angle was at a partial angle,ellipsoidal particles showed a 25%increase in both scattering and absorption efficiency compared to their equal volume spheres.When the polar angle was 90°,these parameters decreased significantly by 20%.As the axial ratio increased,the ratio of scattering and absorption efficiency between rotating ellipsoids and their equal-volume spheres decreased exponentially.This ratio showed a linear increase at certain polar angles.By comparing the variations in absorption coefficient for ellipsoidal particle systems with evenly and normally distributed particle orientation angles,we demonstrated the importance of incorporating a particle orientation angle distribution function into correlation calculations.

关 键 词：椭球粒子 等效介电张量 Rayleigh散射 取向角分布函数 

分 类 号：P422.3[天文地球—大气科学及气象学] O436.2[机械工程—光学工程]