带电沙尘暴对电磁波传播过程的影响  

Effects of Charged Sandstorm on Electromagnetic Wave Propagation

作　　者：闵星[1,2] 李兴财[1,2] 李新碗[1,3] 马鑫[1,2,4] 

机构地区：[1]宁夏大学物理电气信息学院,宁夏沙漠信息智能感知重点实验室,宁夏银川750021 [2]兰州大学西部灾害与环境力学教育部重点实验室,甘肃兰州730000 [3]上海交通大学密西根学院,上海200240 [4]上海交通大学电子信息与电气工程学院,上海200240

出　　处：《光学学报》2015年第1期405-412,共8页Acta Optica Sinica

基　　金：国家自然科学基金(11302111);科技部国际合作项目(2011DFA11780);宁夏自然科学基金与宁夏大学联合资助项目(NZ12117);西部灾害与环境力学教育部重点实验室(兰州大学)开放课题

摘　　要：基于极化面电荷密度和瑞利散射理论,通过数值计算与仿真讨论了风沙静电场对沙粒光学性质的影响。数值结果表明:在考虑风沙静电场作用的情况下,沙粒对电磁波的散射效率随着电荷分布角的增加先增加后减小,而其对电磁波的吸收效率保持恒定,但其值远大于不考虑环境电场作用时的对应值。另外,随着沙尘浓度及其含水量的增加,沙尘暴对电磁波的衰减率增强。结果说明在沙尘暴遥感的研究中必须考虑到沙尘暴中的静电场作用。Based on the polarization charge density and Rayleigh scattering theory, the impact of wind and sand electrostatic field on the optical properties of sand is discussed through numerical calculation and simulation. The results show that in considering the effects of sand electrostatic field, the sand scattering efficiency to electromagnetic waves firstly increases and then decreases with the charge distribution angle increasing, and the absorption efficiency to electromagnetic waves keeps a constant, but its magnitude is much larger than that of not considering the environmental electric field. In addition, the sandstorm attenuation to electromagnetic waves increases with the increase of particle concentration and humidity. Those results illustrate that it is necessary to consider the function of sandstorm electrostatic field in the remote sensing of sandstorm.

关 键 词：大气光学 风沙静电场 瑞利散射 表面电荷 局部带电 

分 类 号：O436[机械工程—光学工程]