Acoustic characteristics of porous media with tube‐shape pores in water

Acoustic characteristics of nonrigid porous media with tube‐shape pores in water are experimentally investigated. Lucite and sand sediment are selected as the specimens. The porosities of specimens are controlled with the artificial pores of circular cylindrical tube‐shape. The fast and slow longitudinal waves are identified in such porous media. The phase velocity, pressure transmission coefficient, and attenuation coefficient of the fast and slow waves are measured as the functions of frequency and porosity. This study may be applicable to acoustic diagnosis of ocean sediment and cancellous bone. [Work supported by BK21 Program, KRF (KRF‐2000‐015‐DP0718), and KOSEF (KOSEF‐2000‐0238‐100) in Korea.]