Dynamic response estimation of multilayer ferroelectret-based transducers using lumped-element electromechanical models

In this work, we show that in spite of the anisotropy of the ferroelectret Emfit film and the inhomogeneity of its vibratory behavior, the average frequency response of multilayer transducers in air is fairly well predicted with lumped element models. Transducers prototypes of up to three layers were built using plastic adhesive tapes and characterized by means of interferometric measurements on the uppermost layer surface. Each Emfit layers have been modeled by means of a damped spring-mass system. A good agreement between theory and experimentation was obtained following a constrained parameter identification procedure.