为研究太赫兹波在沙尘暴中的传播特性, 应用Mie散射理论研究了太赫兹波段沙尘粒子的散射特性, 得到沙尘粒子的散射效率因子、消光效率因子和吸收效率因子随粒径、太赫兹波长的变化关系。基于沙尘粒子尺寸的对数正态分布, 数值计算了沙尘暴的太赫兹衰减。研究结果表明, 沙尘的衰减随能见度的增大而减小, 波长越小, 沙尘暴引起的太赫兹波衰减越大；波长为40 μm时, 沙尘暴对太赫兹波传播影响最大, 浮尘对太赫兹波传播影响最小。低能见度沙尘暴对太赫兹波传播影响明显。

To research the propagation characteristics of terahertz wave in sand and dust storms, based on Mie theory, the scattering characteristics of sand/dust particles are investigated for terahertz wave band, and the relationships of scattering efficiency factor, extinction efficiency factor and absorption efficiency factor with particle size and terahertz wavelength are obtained. The attenuation characteristic of terahertz electromagnetic wave propagation in sand and dust storms are calculated for sand and dust particles with log-normal size distribution. The research results show that the wave attenuation decreases with the increase of visibility of sandstorms and terahertz wavelength. From the numerical results of different sand weather at a wavelength of 40 μm, it is shown that sand-dust storm yields the highest effect for terahertz electromagnetic wave propagation, while the natural sand gives the lowest effect. The effect of low visibility sand and dust storms on terahertz wave propagation is obvious.