Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 11: New Instruments and Methods
CPP 11.9: Vortrag
Dienstag, 27. März 2012, 12:00–12:15, C 243
Piezoelectric PVDF as an acoustically calibrated transducer — •Marcel Kappel, Gunnar Gidion, and Reimund Gerhard — Universität Potsdam, Institut für Physik und Astronomie, Potsdam
The application of piezoelectric polyvinylidene fluoride (PVDF) as a calibrated acoustical sensor is tested and characterized with different methods. Characteristic parameters, such as the static pressure and the amplitude of the dynamical force on the PVDF film, as well as the sensor long term stability, are varied in order to evaluate the effectivity and durability of the electro-mechanical conversion represented by the piezoelectric coefficient d33. Also the frequency response of the piezopolymer as sensor and actuator was investigated. Using thin film sensors made from PVDF, we describe measurements made on a conceptional piano model and on a real piano manufactured by Bechstein. The PVDF probes were mounted between the resonance board and the sound bridge, in combination with a condensor microphone for airborne sound. Beside both recording techniques were directly compared, the temporal distribution of the vibrational energy within the measured setup could be deduced.