In the practice of NDE, multiple interferences from neighbouring flaws could hide some testing indications. This is avoided by using intense and very short testing pulses. These efficiency and frequency-band requirements are achieved by combining, in the excitation stage,efficient high-voltage step sources with coupling networks designed for each ultrasonic emitter. This type of circuit incorporates various non-linear devices such as diode networks and high-voltage switching devices. Strong interactions can arise between these electronicdevices and the connected piezoelectric transducers,
influencing the time-responses in transceiver terminals:driving pulses and echo signals. These interactions are
neglected, or are only considered in a simplified way, in conventional modelling approaches.