Abstract:A novel detection system for second harmonic ultrasonic pulse waves is constructed by modifying the double-layered piezoelectric transducer (DLPT). The new DLPT composed of two PbTiO 3 thickness-mode piezoceramic concave disks is employed: one is a conventional concave transducer and the other is a ring type concave transducer. Since the switch for the electrical connection used in the conventional DLPT system is not required, a simple system for detecting second harmonic ultrasonic pulse waves can be construc… Show more