Different tuning contributions in piezoelectric transceivers improving transient signals for ultrasonic imaging

Ultrasonic applications based on piezoelectric devices usually introduce some kind of electrical tuning circuits which are normally fitted in an experimental way. In this paper, the influences of these tuning elements on piezoelectric transceivers are analysed in transient regime, by sensing the ultrasonic signals received through two piezoelectric processes linked in cascade: a transmitter of echographic imaging type, and a broad-band piezoelectric ultrasonic receiver. The relative contributions, in order to improve the image resolution, from two parallel tuning circuits in emission and reception, are separately evaluated. Signal spectra and transducer transfer functions are obtained for different tuning conditions.