Abstract
The line-focus-beam ultrasonic material characterization system can perform material characterization by accurately measuring the propagation characteristics (viz., phase velocity V_<LSAW> and attenuation α_<LSAW>) of leaky surface acoustic waves (LSAWs) excited on the water-loaded specimen surface. In the conventional theoretical calculations, water was treated as an ideal fluid and the shear-wave component was not considered for the boundary conditions. In this paper, we studied an exact measurement model of LSAW propagation characteristics for synthetic silica glass and borosilicate glass, considering the shear-wave component in the water-loading effect and viscosities of longitudinal and shear waves for both specimen and water. The calculated results for this advanced measurement model exhibit dispersion for both LSAW velocities and normalized attenuation coefficient factors. This is mainly caused by the effect of shear-wave component of water.
