【摘要】 依据BiotStoll的流体饱和多孔媒质声传播理论,考虑了流体粘滞和骨架非弹性损耗引起的衰减因素,研究了多孔圆柱体对平面声波的散射特性.计算了在开孔和闭孔状态下多孔圆柱的背向散射形式函数和散射声强的方向分布,以及边界处的力学状况和声传播中的损耗因素对散射特性的影响.利用宽带超声实验系统测量了多孔圆柱的背向散射谱.实验测量结果与理论预计值符合得较好更多还原

【Abstract】 The scattering characteristics of plane acoustic waves by fluid\|saturated porous cylinders are studied by using the Biot\|Stoll’s theory with consideration of loss factors, such as the viscosity of fluid and the nonelastic loss of solid skeleton. The backscattering form functions and the scattering intensity patterns of a porous cylinder with sealed and open pore boundaries are calculated. The boundary conditions and loss factors in porous media are found to have a great influence on scattering. By using a broad\|band ultrasonic experiment system, we have measured the backscattering spectrum of the porous cylinder sample, which is found to be in good agreement with the predicted results.更多还原