Sound scattering by fluid-saturated porous cylinders

The scattering characteristics of plane acoustic waves by fluid-saturated p orous cylinders are studied by using the Biot-Stoll's theory with considera tion of loss factors, such as the viscosity of fluid and the nonelastic los s of solid skeleton. The backscattering form functions and the scattering i ntensity patterns of a porous cylinder with sealed and open pore boundaries are calculated. The boundary conditions and loss factors in porous media a re found to have a great influence on scattering. By using a broad-band ult rasonic 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.