Homogenized electromechanical coefficients and effective parameters of 1–3 piezocomposites for ultrasound imaging transducers
Résumé
Analytical models can be useful tools to develop efficient transducers dedicated to a specific application field. This work proposes a homogenization technique for establishing the effective coefficients and parameters of 1-3 piezocomposite whose both phases are piezoelectrically active. Such piezocomposite materials may have homogenized electromechanical properties resulting from positive hybrid effect. A numerical simulation of the effective parameters resulting from a PZT-5A / PVDF-TrFE composition shows that, volume fraction influences significantly on the properties of the piezocomposite and consequently on its behaviour in service. As an end-user application for ultrasound imaging, those piezocomposite materials are effectively integrated in a piezocomposite transducer, coupled with a dedicated backing. The resulting characteristics in terms of impulse response and associated electroacoustic echo are compared and discussed for typical configurations. A method for the optimization of the design of such piezocomposite transducer is presented. Specific estimators based on the bandwidth flatness B W F and bandwidth amplitude product B W A are proposed as stable and smooth criteria for an optimization procedure.
Domaines
Acoustique [physics.class-ph]
Fichier principal
2021 - TizeMha - Homogenized electromechanical coefficients and effective parameters of 1-3 piezocomposites for ultrasound imaging transducers.pdf (717.97 Ko)
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