浑水中兆赫频率的声衰减实验研究

Megahertz acoustic attenuation in fluidized mud

文章报道了浑水中的声衰减的实验研究结果,超声波的频率分别为1、2、3、4、5MHz。实验表明:在同一个含沙量M的浑水中,声衰减系数β大致随频率f的增加而线性增加;对同一个频率f,声衰减系数β大致随含沙量M的增加而线性增加;在同一个频率f和相同含沙量M的情况下,声衰减系数β随泥沙粒径的增加而增加。

An experimental study of megahertz acoustic attenuation in fluidized mud has been made respectively in Shanghai Acoustics Laboratory, Chinese Academy of Sciences and in University of Sydney, Australia. The frequencies f of sound waves are 1,2,3,4,5 MHz. The experimental results show that as an approximation,(1) β increases linearly with f for a same M, (2) β increases proportionally with M for a same f, and (3) β increases with grain size of sediments for same f and M, where β- the acoustic attenuation in dB/m, M - the sediment concentration in kg/m3.