Piezoelectric two-layer stacks of cellular polypropylene ferroelectrets: transducer response at audio and ultrasound frequencies (original) (raw)

2005, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control

Piezoelectric cellular polypropylene films, socalled ferroelectrets, are assembled in a stack with two active transducer layers. The stack is characterized with respect to its linear and quadratic response in a frequency range from 1 kHz to 80 kHz. A relatively smooth frequency response in the sound-pressure level is found for the individual layers as well as for both layers driven in phase. The piezoelectric response of the two-layer stack is twice the response of an individual layer over a rather broad frequency range. Furthermore, the influence of the preparation conditions on the resonance frequency and the effect of the quadratic distortion on the radiated sound are investigated both for the individual transducer films in the stack and for the stack system as a whole. Michael Wegener was born on September 24, 1968, in Neuruppin, Germany. He studied physics and mathematics at the University of Potsdam, Potsdam, Germany, from 1990 to 1995. In February 2000, he received a Ph.D. degree in physics. Major topics of his Ph.D. work were the electrical properties of polymers (mainly pyro-, piezo-, and ferroelectricity) and their variation during and after electrical, thermal, and chemical parameter changes.

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