Influence of inclined surfaces on Rayleigh velocities in acoustic microscopy

Several models have successfully explained V(z) curves of flat surface materials obtained by acoustic microscopes. Using the acoustic ray model, the authors derive expressions of periods and Rayleigh velocities for samples having an oblique upper surface. It is shown that both parameters vary with inclination angles. A universal curve for such variations, valid for all materials, is proposed and can be used to obtain the exact parameter values