Scattering of an ultrasonic beam from a curved interface
We calculate the wavefield scattered from a circular fluid-solid interface when it is struck by a well collimated ultrasonic beam, emitted from a transducer in the fluid. Both convex and concave interfaces are considered. The radius of curvature of the interface is assumed to be sufficiently large that only reflection, transmission and the excitation of a leaky Rayleigh wave need be considered; the incident beam does not graze the interface. The incident beam is modeled as a two-dimensional wavefield whose initial profile is either Gaussian or rectangular. In both cases the aperture is assumed to be many wavelengths across and the interface close enough to the aperture that it is struck by a wavefield that has not yet evolved into a cylindrical wave. The scattered wavefields are represented as multiple contour interals and are evaluated asymptotically.
scientific article; zbMATH DE number 4135647
scientific article