基于Mie理论的带电沙尘媒质微波衰减特性研究

目的研究带电沙尘媒质中微波衰减特性。方法根据带电球形粒子Mie散射理论,分析带电沙尘粒子的散射特性及带电沙尘媒质的微波衰减。结果在同一频率下,消光系数随着沙粒半径增大而增大,带电沙粒的消光系数要大于不带电沙粒的消光系数。对于同一频率和能见度,带电沙的衰减要比不带电沙的衰减要大,且衰减随能见度的增大而减小。结论带电沙尘粒子对微波传播影响比中性沙尘粒子明显。

Microwave Attenuation Characteristics in Charged Sand and Dust Medium Based on Mie Theory

Objective To research microwave attenuation characteristics in charged sand and dust. Methods According to Mie scattering theory for a charged spherical particle, the scattering of charged sand and dust particle and attenuation properties for a medium with charged sand and dust particles were investigated. Results At the same frequency, the normalized extinction cross section increased with increase of particle radius size. The extinction coefficient of charged sand particles was greater than that of uncharged sand particles. The attenuations induced by charged sand and dust particle were greater than those of uncharged sand, and wave attenuation decreased with the increase of visibility. Conclusion The effects of charged dust particles on microwave propagation are more obvious than those of neutral dust particles.