Complex elastic coefficient and mechanical losses for piezoelectric resonators under transversal and thickness modes

Autor(es)

Arnold, Francisco Jose ; Goncalves, Marcos Sergio ; Massaro Junior, Flavio Rubens ; Martins, Paulo Sergio

• Tipo de documento: Artigo Científico
• Fonte: Ferroelectrics; v. 504, n. 1, p. 104-115, 2016.
• Citações Web of Science: 0

Resumo

The performance of piezoelectric transducers depends upon a set of physical parameters. Among them, losses are one of the most important. Mechanical losses in piezoelectric devices are studied using complex numbers in the elastic coefficients of the models. Usually, numerical methods are employed to obtain the loss parameters through the minimization of an error function. We insert mechanical losses dependent on frequency in Mason's model to evaluate how this dependency affects the electrical impedance curve. The results show that a better curve fitting is achieved when the mechanical loss is a first order function of frequency. (AU)

• Processo FAPESP: 11/12792-3 - Desenvolvimento de métodos numéricos 3D no domínio da frequência para análise de acopladores ópticos
• Beneficiário: Marcos Sergio Goncalves
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/07639-4 - Amplificador de potência para transdutores piezelétricos
• Beneficiário: Francisco José Arnold
• Modalidade de apoio: Auxílio à Pesquisa - Regular