V(z) calculation for a focused beam incident on an inclined plane

A material characterization with acoustic waves has been extensively developed by V(z) inversion. A line-focus-beam technique, which uses oblique incidence of an acoustic wave into a solid sample from certain direction, is extremely useful especially in anisotropic solids. Very recently an attempt using spherical planar pair lenses has been analyzed and demonstrated. From this point of view, we present a theoretical investigation of the V(z) characteristics of a focused beam incident on an inclined solid sample in this paper. A basic formula is derived in which an acoustic beam focused with a spherical lens is incident on an sufficiently inclined sample-couplant interface plane is reflected and collected with the same acoustic lens(monostatic case) or the other lens(bistatic case), and V(z) curves are analyzed using the actual physical parameters of materials