Studies of cylindrical Rayleigh waves with laser-ultrasonics

Cylindrical Rayleigh waves, which are elastic surface waves occurring at th e interface between a cylinder and vacuum. are investigated by User Ultraso nics, First, the dispersive curves are obtained theoretically for cylindric al Rayleigh waves generated by line source. These dispersive curves show th at the velocities of propagation of these waves depend on the radii of cyli nders and the frequencies of the exciting source. Then, the normal displace ment of these waves are measured experimentally by a Laser-Ultrasonic syste m. The group-velocity dispersive curves are obtained from the experimental data by the pseudo-Wigner-Ville distribution (PWVD), one of the time freque ncy analysis methods. Good agreement is found between the theoretical and e xperimental dispersive curves.