Spurious Echo Generation in Pulse Piezoelectric Transducer for Acoustical Imaging and its Reduction

Abstract

In the pulse-echo acoustic imaging systems, a piezoelectric transducer is used to generate an acoustic pulse and to receive the echo produced by the target. When the echo arrives on the transducer surface it is partly transmitted in the transducer body, partly reflected again. On the target it experience an other reflection and then it come back to the transducer producing a second unwanted echo. This phenomenon generates a strong artifact in the image if the spurious echo amplitude is comparable with that of the first true echo.