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Abstract
This work presents an improved method for measuring the direct piezoelectric voltage and energy of flexible polymers. Well-controlled stress is applied with a four-point bending system and voltage is measured in real open-circuit conditions. The presented method separates the piezoelectric part from the measurement part by introducing a mechanical switch, allowing instantaneous post-deformation discharge measurements. Oscilloscope and contact-less electrostatic voltmeter are compared. Direct piezoelectric measurements under open-circuit conditions have been performed on commercial PVDF (polyvinylidene fluoride) and its copolymers. Significant differences to data sheet values (close-circuit conditions) are reported and commented.
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Details
1 CEA, LETI, MINATEC Campus, F38000, Grenoble, France
2 G2Elab, University Grenoble Alpes, F38000, Grenoble, France; CNRS, University Grenoble Alpes, F38000, Grenoble, France