带电粒子的Mie散射研究  

Mie scattering of electromagnetic waves by charged sphere particle

作　　者：张自嘉[1,2] 潘琦[1] 陈海秀[1,2] 

机构地区：[1]南京信息工程大学信息与控制学院,江苏南京210044 [2]南京信息工程大学气象灾害预报预警与评估协同创新中心,江苏南京210044

出　　处：《电波科学学报》2015年第3期429-436,共8页Chinese Journal of Radio Science

基　　金：国家自然科学基金(No.61172029;51206082;61302189)

摘　　要：利用电磁波散射理论研究了带电粒子的电磁波散射特性,给出了散射系数与电磁阻抗系数及表面电导率的关系,计算和对比了不同面电导率的粒子与中性粒子对电磁波散射系数和散射能量分布的差别.计算结果表明:面电荷使面电导率达到微西门子量级时,会有明显的影响随着面电导率的增加,散射系数发生较大变化,但当面电导率达到一定值时,散射系数趋于恒定;对尺度较大的粒子,带电后的散射系数减小,但沿不同方向的散射能量会重新分配,一些方向散射增强,另一些方向散射减小;尺度较小的粒子带电后,散射系数增大,但能量沿不同方向的重新分配不明显.According to the theory of the Mie's scattering of the charged particles and the characteristics of the Mie scattering,the reduced scattering coefficient is derived,that is related to the surface density and the electromagnetic impedance in vacuum.The Mie scattering characteristic is compared by calculating the scattering coefficient of the charged and neutral particles.The pure charges carried on the surface of the particles increase the surface conductivity,and then affect the scattering electromagnetic waves.When the surface conductivity reach magnitude of millisiemens,it will have obvious effects,as the surface conductivity increases,the scattering coefficient will have bigger change.When the conductivity reaches a certain value,the scattering coefficient tends to be stable.With the increase of conductivity,scattering intensity also increased,but to a certain value,the scattering intensity is no longer increased significantly.For a bigger particle,the scattering coefficient will reduce after charged,but the scattering energy along different directions would redistribute,some direction scattering enhance,others decrease.For a smaller particle,the scattering coefficient will increases,but the redistribution of energy along different directions is not obvious.

关 键 词：带电粒子 电磁波散射 MIE散射 

分 类 号：TN011[电子电信—物理电子学]