云雾对THz波传播的衰减研究

      Attenuation of Terahertz-wave due to cloud and fog

      • 摘要: 基于云雾的粒子尺寸分布, 利用Rayleigh近似和Mie理论计算了不同能见度和含水量的云雾对THz波的传播衰减.结果表明:THz波段的云雾衰减较微波、毫米波段的衰减严重得多; THz波段的云雾衰减随能见度的减小和含水量的增加而增大, 对于相同能见度和含水量的云雾衰减并非随频率的提高而单调增加; 同时温度对THz波段的云雾衰减影响不大, 在整个THz波段并不存在明显的规律.

         

        Abstract: Based on the fog drop size distribution (DSD) model of radiation and advection fog, the propagation attenuation of the fog is obtained in THz band by using Rayleigh absorption approximation and Mie theory. The results show that the fog attenuation in THz band is larger than that in microwave and millimeter band. The attenuation is increases as the water content increases or as the visibility decreases. The attenuation of fog with same water content or visibility varies non-monotonically with frequency increases. Meanwhile, the effect of temperature is not significant during the range fog can presence and has no regular pattern in the THz band.

         

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