Abstract
Many applications of non destructive testing employ piezoelectric transducers operated in through-transmission mode, to perform C-scan ultrasonic imaging. Normally a high efficiency and a pulsed regime for the ultrasonic process are required. The enlargement of both the amplitude and bandwidth in the testing signals permits to improve the resolution and sensitivity of the imaging systems. This can be done by means of external electric circuits. In this paper, the effects of some electrical matching components over the global emitter-receiver piezoelectric transduction performance, are analyzed under transient operating conditions, considering the signal waveforms and frequency spectra. In particular, a broadband configuration with inductive tuning circuits individualized for both transmitter and receiver subsystems is evaluated, by means of equivalent circuit analysis, computer simulation, and experimental assessment.
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