It was recently proposed that the lateral resonances around the working resonance band of ultrasonic piezoelectric sandwich transducers can be stopped by a periodic array of circular holes drilled along the main propagation direction (a phononic crystal). In this work, the performance of different transducer designs made with this procedure is tested using laser vibrometry, electric impedance tests and finite element models (FEM). It is shown that in terms of mechanical vibration amplitude and acoustic efficiency, the best design for physiotherapy applications is when both, the piezoceramic and an aluminum capsule are phononic structures. The procedure described here can be applied to the design of power ultrasonic devices, physiotherapy transducers and other external medical power ultrasound applications where piston-like vibration in a narrow band is required.
Acknowledgments
J.L.A. wishes to thank DGAPA-UNAM-PAPIIT for financial support through grant IN110817. F.M. wishes to thank to CICYT DPI2013-46915-C2-1-R and DPI2016-80254-R support. Finally, F.M. and J.L.A. thank the “Programa de Movilidad Académica de la Coordinación de la Investigación Científica-UNAM”.
