부산대학교 도서관

A study of acoustic waves propagating along a fluid–solid plane interface, induced by thermoelastic excitation with a laser beam, is performed. The displacement of the interface in the time domain is predicted with an integration over frequency and on different Riemann sheets. The prediction, which includes the effect of the bulk waves induced by the thermoelastic excitation, can be performed at small distances from the heated region. For a bulk velocity in the fluid smaller than the shear wave velocity in the solid (water–glass configuration), and between the velocity of the shear and the compressional wave (water–plexiglass configuration), the poles that contribute to the displacement are identified by comparing the results of the integration in the different paths. A first analysis of the laser induced surface modes for water–porous ceramics configurations is performed in the context of the Biot theory. Measurements are presented. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR]