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Integration of piezoelectric polymer transducers into microsystems for sensing applications

 
: Schulze, R.; Gessner, T.; Schueller, M.; Forke, R.; Billep, D.; Hahn, R.; Heinrich, M.; Sborikas, M.; Wegener, M.

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Institute of Electrical and Electronics Engineers -IEEE-:
International Symposium on Applications of Ferroelectrics held jointly with European Conference on the Applications of Polar Dielectrics and International Symposium Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials, ISAF/ECAPD/PFM 2012. Proceedings : 9th - 13th of July 2012, Aveiro, Portugal
New York, NY: IEEE, 2012
ISBN: 978-1-4673-2668-1 (Print)
ISBN: 1-4673-2668-2
ISBN: 978-1-4673-2669-8
4 S.
International Symposium on Applications of Ferroelectrics (ISAF) <21, 2012, Aveiro>
European Conference on the Applications of Polar Dielectrics (ECAPD) <11, 2012, Aveiro>
International Symposium Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials (PFM) <2012, Aveiro>
Englisch
Konferenzbeitrag
Fraunhofer ENAS ()
Fraunhofer IAP ()

Abstract
A polymer-based sensor for low frequency acceleration detection is fabricated by using microinjection molding technologies. Finite Element simulations and characterization of the sensing functionality are done. Due to an out-of-plane acceleration a force is applied to a seismic mass (length and width each 3.2 mm, thickness 1 mm), which leads to a deformation of a connected plate with dimensions of 1 mm × 1 mm × 50 ?m. Thus, charge separation at the electrodes of integrated piezoelectric polyvinylidene fluoride (PVDF) copolymer sheets occur and can be measured as sensor signal. A charge sensitivity of 0.57 pC/g is determined which is in good agreement with the simulation results. A resonance frequency of 660 Hz was measured. Furthermore, the sensor concept as well as preparation technologies to assemble a compound structure containing piezoelectric layers and the system integration by micro injection molding are discussed. In addition, different bonding techniques for the assembly of the functional components are investigated and described.

: http://publica.fraunhofer.de/dokumente/N-218800.html