基于Mie散射的带电粒子散射特性的研究

Study on the scattering characteristics of charged particles based on Mie scattering

基于Mie散射研究了带电粒子的散射特性,给出散射系数与表面电导率的关系,计算了不同面电导率粒子与非带电粒子的散射角,计算表明:对金属类粒子,带电后的散射影响不大;但带电介质类粒子如水球、冰球粒子,面电荷使面电导率达到一定量级时,对散射特性有明显的影响。与水球相比,冰球的散射系数振荡现象处于粒子尺度参数更大值,振幅更强,而当面电导率很大时,即携带更多电荷量时,两者散射效率近似相等,与同大小的金属球形粒子的散射效率接近。随着面电导率的增加,散射系数发生较大变化,但当电导率达到一定值时,散射系数趋于恒定。相对非带电粒子的散射,带电后粒子的散射系数减小,散射能量沿不同方向重新分布,后向散射强度增强,其他方向的散射强度减小。当冰球粒子与水球粒子面电导率大到一定程度时,其散射特性都接近等大金属粒子的散射特性。

Based on Mie scattering,the scattering characteristics of charged particles are studied,the relationship between scattering coefficient and surface conductivity is given,the scattering angles of charged particles and non-charged particles with different surfaces are calculated,and the results show that the charged scattering has little influence on metallic particles.However,when the surface charge makes the surface conductivity reach a certain order,the scattering characteristics of dielectric particles such as water sphere and ice hockey particles are obviously affected.Compared with the water sphere,the scattering coefficient oscillation phenomenon of the ice sphere is similar to the scattering efficiency of the metal spherical particles of the same size when the particle size parameter is larger and the amplitude is stronger,and the scattering efficiency is similar to that of the metal spherical particles of the same size when the face conductivity is very high,that is,when more electric charge is carried.With the increase of surface conductivity,the scattering coefficient changes greatly,but when the conductivity reaches a certain value,the scattering coefficient tends to be constant.Compared with the scattering of non-charged particles,the scattering coefficient of charged particles decreases,the scattering energy is redistributed in different directions,the backscattering intensity is enhanced,and the scattering intensity in other directions decreases.When the surface conductivity of ice hockey particles and water polo particles is large enough,their scattering characteristics are close to that of metal particles of the same size.