Abstract
Abstract We present a new method for measuring static force or pressure using a piezoelectric element. Our structure is based on a composite resonator using PVDF, brass electrodes and rubber. This resonator presents a resonance frequency shift under applied stress. The observed phenomenon is mainly due to the variation of the acoustic impedance discontinuity between PVDF and brass electrode. We have developed a one dimensional model to describe the resonator, then the design of the device is realized with controlled roughness of the brass electrode surface. A low cost electronic system is developed to analyze the resonator and to measure the applied stress. Good results are obtained with a composite resonator having the following elements: PVDF with thickness of 110 μm; brass electrode with thickness of 100 μm and roughness of 1 μm; rubber with thickness of 4 mm. With this resonator we obtain a sensibility of 0.92 KHz/N and a measurement range of 350 N.
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