Beschreibung:
<jats:p>The Singularity Expansion Method (SEM), as developed for radar scattering, is applied to the problem of acoustic transients of short duration. The scattering amplitude of an impenetrable (rigid or soft) sphere is separated, via the Watson transformation, into a specularly reflected wave and into a remainder which represents creeping waves, but which is transformed here into the usual SEM series of poles in the complex-frequency plane, and their residues. While in the time domain, these give rise to a series of damped sinusoidal signals, a summation of the series using the method of stationary phase, which is being carried out here, determines the shapes of creeping-wave pulses for the case of an incident δ-function pulse.</jats:p>