BROADBAND 1-3 PIEZOCOMPOSITE TRANSDUCERS FOR UNDERWATER ULTRASOUND

There are many advantages of 1-3 piezocomposite transducers, such as lighter weight, lower specific acoustic impedance. The matching layer is commonly used to expand the bandwidth of composite transducers. The finite element modal of transducer was set up with ANSYS software and the structure of the transducer was optimized. A final 1-3 piezocomposite transducer was designed, which used the first thickness mode, the first lateral mode and the third thickness mode. The bandwidth of the transducer is 120kHz-470kHz, in which the ripple of the transmitting voltage response does not exceed +/- 5dB. There are several conclusions from the research: the bandwidth of 1-3 piezocomposite transducers can be expanded by the first thickness mode, the first lateral mode and the third thickness mode, and it gives a method to achieve the broad-band projecting performance of high-frequency transducers.