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Author Buchberger, G. ♦ Schwodiauer, R. ♦ Arnold, N. ♦ Bauer, S.
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2008
Language English
Subject Domain (in DDC) Technology ♦ Engineering & allied operations ♦ Applied physics
Subject Keyword Keyboards ♦ Tactile sensors ♦ Piezoelectric materials ♦ Piezoelectric effect ♦ Detectors ♦ Piezoelectric transducers ♦ Biological materials ♦ Electrodes ♦ Transmission line matrix methods ♦ Mathematical model
Abstract Cellular polypropylene ferroelectrets are flexible and conformable transducer materials with a dominant longitudinal piezoelectric effect. They can be used in a wide range of pressure sensing applications. We present concepts for position sensitive touchpads and keyboards based on piezoelectric materials with a dominant longitudinal piezoelectric effect. As large area electrodes are superimposed onto the ferroelectret and combined with electronics at the edges, complex sensor matrices are avoided. We use a ferroelectretic detector stripe as a model system for the theoretical description of the touchpad and show that this detector can be treated mathematically analogous to a transmission line. We present the solutions of the corresponding differential equations under the appropriate boundary conditions and experimental results that are in agreement to them. For the flexible, ferroelectretic keyboard we use a binary or balanced ternary coding technique profiting from the polarization of the ferroelectret.
Description Author affiliation: Soft Matter Phys., Johannes Kepler Univ., Linz (Buchberger, G.; Schwodiauer, R.; Arnold, N.; Bauer, S.)
ISBN 9781424425808
ISSN 19300395
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2008-10-26
Publisher Place Italy
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Size (in Bytes) 812.96 kB
Page Count 4
Starting Page 1520
Ending Page 1523


Source: IEEE Xplore Digital Library