Department of Mechanical Engineering and Applied Research Laboratories, The University of Texas, Austin, Texas 78713-8029, USA.
J Acoust Soc Am. 2011 Apr;129(4):EL101-7. doi: 10.1121/1.3544678.
Sound propagation in water-saturated granular sediments is known to depend on the sediment porosity, but few data in the literature address both the frequency and porosity dependency. To begin to address this deficiency, a fluidized bed technique was used to control the porosity of an artificial sediment composed of glass spheres of 265 μm diameter. Time-of-flight measurements and the Fourier phase technique were utilized to determine the sound speed for frequencies from 300 to 800 kHz and porosities from 0.37 to 0.43. A Biot-based model qualitatively describes the porosity dependence.
水饱和颗粒沉积物中的声波传播已知取决于沉积物的孔隙率，但文献中很少有数据同时涉及频率和孔隙率依赖性。为了开始解决这个不足，使用流化床技术来控制由直径为 265μm 的玻璃球组成的人工沉积物的孔隙率。飞行时间测量和傅里叶相位技术用于确定频率在 300 至 800kHz 之间以及孔隙率在 0.37 至 0.43 之间的声速。基于 Biot 的模型定性地描述了孔隙率的依赖性。
