A micro transducer based on contour-extensional vibration mode

The contour-extensional vibration mode is of practical importance in piezoelectric transformer. However, compare with conventional thickness mode transducer, it is difficult to be designed and realized. This paper reports a new type micro piezoelectric transducer based on contour-extensional mode with theoretical simulation analyses and experiments support. A 2.5MHz transducer prototype with dimensions 2*0.6*1 mm is designed by FEM and compared by experiment. The fabricated transducer is judged by performance parameters of measured the impedance curve, received acoustic pulse maximum waveform and acoustic intensity distribution. The main advantages of using contour-extensional are that can get the higher electromechanical coupling and solve miniaturization issues of thickness direction. The contour-extensional transducer has the targeted application in vivo thrombolytic therapy and ultrasound-guide of pedicle screws.