Model-Based Poling of Piezoelectric Monolithic Ring Elements for Ultrasonic Torsional Transducers
Autor: Minghui Huang
ISBN: 978-3-944586-24-3
Dissertation, Leibniz Universität Hannover, 2013
Herausgeber der Reihe: Jörg Wallaschek
Band-Nr.: IDS 06/2013
Umfang: 108 Seiten, 73 Abbildungen
Schlagworte: Poling technique, Poling technique, torsional transducer, piezoceramic
Kurzfassung: Today the designs and applications of ultrasonic torsional transducers are limited by the availability of suitable poled piezoelectric elements. The thesis aims at the poling of piezoelectric monolithic ring elements with polarization in circumferential direction to achieve an adequate torsional output. Both modeling and experimental investigations are performed: two poling patterns with fan-shape and parallel-shape electrode configurations are compared and optimized. Piezoelectric monolithic ring samples are poled based on the poling parameter study and then characterized by quasi-static and dynamic measurement methods. They show advantages on the mechanical quality factor and electrical admittance in comparison to conventional manufactured torsional elements. The assembled torsional transducer using the poled samples has been designed, assembled and tested. The results present promising perspectives for manufacturing compact and cost-efficient torsional transducers in future.