The design of narrow-band water loaded ultrasound transmitters

The performance of thin-disk transducers made of PZT-5A ceramic using acoustic matching and air-backing is described using simplified 1-D model and experimental results. Several ultrasound transducers have been designed for studying influence of high power ultrasound energy on tissue. PZT-5A ceramic has been used as active element with thickness approximately lambda/2, depending on working frequency (500 kHz, 1 MHz, 2 MHz) and with three different diameter to thickness ratio (D/t) for obtaining different directivity patterns in radiated medium. Theoretical input impedance, conductance and bandwidth of transducer systems has been compared with experimental results. Theoretical results have been derived using Mason´s equivalent circuit