4. 8 Piezoelectric transducers a piezoelectric transducer is an active transducer or self-generating transducer. It utilizes the piezoelectric effect of some materials, which generate electrical changes on some of their surfaces when acted by external forces. So piezoelectric transducers are often used to measure pressure, stress and acceleration etc. and have wide applications in engineering• A piezoelectric transducer is an active transducer or self-generating transducer. It utilizes the piezoelectric effect of some materials, which generate electrical changes on some of their surfaces when acted by external forces. So piezoelectric transducers are often used to measure pressure, stress, and acceleration, etc., and have wide applications in engineering. 4.8 Piezoelectric transducers