Pulsed beam excitation of leaky Rayleigh waves on shaped fluid-solid interfaces

The excitation and detection of leaky Rayleigh waves (LRW) on fluid-solid planar and cylindrical interfaces by pulsed Gaussian transducers is modeled efficiently using a frequency-domain spectral analysis combined with the complex-transducer-point (CTP) method, uniform asymptotic techniques, and a Fourier transformation. The reflected signal from the interface, due to an incident beam phase-matched to the LRW, is given in terms of wave arrivals that are directly related to the observed phenomena, namely, a specularly reflected wave and a LRW. Numerical results, for two-dimensional transducers interacting with water-aluminum interfaces, are shown to illustrate the application of the theory. Effects due to the receiver finiteness and alignment on the detected data can be easily investigated with this formalism, and are shown here for frequency-domain data