title: Nonlinear constant evaluation in a piezoelectric rod from analysis of second harmonic generation.
abstract: The design of transducers requires a clear understanding of their electromechanical behavior. This involves precise linear modeling as well as characterization. With the development of novel techniques such as harmonic imaging as well as high-power applications, nonlinear aspects must also be taken into account. In this study, harmonic generation in the mechanical displacement of a piezoceramic rod under high sinusoidal electric fields was measured. Theoretically, the nonlinearity can come from various sources: dielectric, mechanical, and electromechanical. The nonlinearity coming from external sources being eliminated or taken into account, it is shown here that the analysis, over a wide frequency range, of 2 parameters related to the harmonic distortion enables the respective identification of these sources and, at the same time, the evaluation of third-order constants of the material.
authors.affiliation: Université Franşois Rabelais de Tours, Laboratoire Ultrasons Signaux Systèmes et Instrumentation, CNRS ERL 3106/INSERM U930 Ecole Nationale d'Ingénieurs du Val de Loire, Blois Cedex, France. parenthoine_denis@yahoo.fr
authors.forename: Denis
authors.initials: D
authors.lastname: Parenthoine
authors.forename: Lionel
authors.initials: L
authors.lastname: Haumesser
authors.forename: François
authors.initials: F
authors.lastname: Vander Meulen
authors.forename: Marc
authors.initials: M
authors.lastname: Lethiecq
authors.forename: Louis-Pascal
authors.initials: LP
authors.lastname: Tran-Huu-Hue