Research on 1-1-3 piezocomposite broad-band transducers

The matching layer is commonly used to expand the bandwidth of 1-3 piezocomposite transducers.But as time passes,the performance of matching layers will change,this change may cause performance instability of the transducer.By applying the concept of single-ended excitation to 1-3 piezocomposite material,a new piezocomposite structure,that is 1-1-3 piezocomposite material,was achieved.The finite element model of a 1-1-3 piezocomposite transducer was set up with ANSYS software and the structure of the transducer was optimized.A final 1-1-3 piezocomposite transducer was designed which used the first,second,and third thickness modes.The bandwidth of the transducer was 112-450kHz,in which the peak transmitting voltage response was 174dB.Several conclusions can be reached from the research: The bandwidth of piezocomposite transducers can be expanded by the first,second,and third thickness modes.Also,a method was given to achieve the broad-band projection performance of a high-frequency transducer.