Abstract
Absmcr-Transient fields of pulsed ultrasonic sources radiating into water were investigated experimentally. The measurements were made using dot and annular polyvinylidene fluoride (PVDF) spot-poled membrane hydrophones having element dimensions ranging from 0.3 mm to 1.0 mm. The transient ultrasonic fields were generated using thick piezoelectric circular plates and broadband thickness-resonant disks. Both source types produced pulses composed of the expected “plane” and “edge” waves. The amplitude of the received signal from the edge wave varied as the spatial profile of the source velocity and the receiver size were changed, a result consistent with a previously developed theoretical model for the planar baffled piston. Additionally, two head waves arising from the reradiation of longitudinal and transverse lateral (pseudosurface) waves were observed; these interfered with the edge wave over certain regions of the field.
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