Experimental Research On The Sound Wave In Solid And Cross-well Seismic Tube Wave

This paper has carried on the experiments to the propagation characteristics of sound waves in the solids. A new acoustic visualization technique is introduced to realize the experimental observation of the sound spreading process in the opaque solids. The sound fields in aluminum plates and plexiglass plates have been recorded. People can directly observe the sound fields in opaque solids by this method. The sound wave will occur to reflect and transmit and forms the overlapped sound fields of direct wave and the reflected wave when sound wave meets the obstacle in the solid. Besides the research on the isotropic solids, the sound fields in the aluminum sheets when they are forced by one-dimensioned stress also are observed by the experiments. The phenomena, which the wave fronts is twisted along the stress direction, are recoded. It is possible to be caused by acoustical propagation velocity increasing with the stress. From the fluid - solid boundary waves and the sound fields, the acoustical propagation velocity in the solids can be estimated by the geometry computational methods. From the fluid - solid boundary waves, the relatively precise velocity can be obtained by the STC methods.The cross-well seismic data obtained by the cross-well seismic technique always includes the very strong tube waves. These waves overlapped in the reflection signals, have seriously affected the obtain of the available signals. In order to weaken the tube waves before people log the seismic data, this paper has carried on the experimental research on the propagation mechanism of the cross-well seismic tube waves.