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Sensors 2017, 17(4), 729; doi:10.3390/s17040729

The Use of Phononic Crystals to Design Piezoelectric Power Transducers

1
ITEFI-CSIC, Serrano 144, 28006 Madrid, Spain
2
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Apartado Postal 1-1010, Querétaro 76230, Mexico
*
Author to whom correspondence should be addressed.
Academic Editor: Gonzalo Pajares Martinsanz
Received: 31 January 2017 / Revised: 27 March 2017 / Accepted: 28 March 2017 / Published: 31 March 2017
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain 2017)
View Full-Text   |   Download PDF [8321 KB, uploaded 31 March 2017]   |  

Abstract

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. View Full-Text
Keywords: phononic crystals; piezoelectric transducers; physiotherapy phononic crystals; piezoelectric transducers; physiotherapy
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MDPI and ACS Style

Ronda, S.; Aragón, J.L.; Iglesias, E.; Montero de Espinosa, F. The Use of Phononic Crystals to Design Piezoelectric Power Transducers. Sensors 2017, 17, 729.

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