Piezofilm sensors are well qualified for detecting dynamic events, like pressure fluctuations, vibrations or force changes. Especialy under space limited conditions, the extreme thin sensor material is advant use. Because of the high dynamic range, the great bandwidth and the high flexibility a lot of measurement problems could be solved, which is impossible to do with other techniques.
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AllgemeinesThe piezofilm is a transparent film of highly polar poly-vinylidene-fluoride (PVDF). In proportion to the influence of mechnical stress or strain the film develops an electrical charge, that could be shunted over the metall coated surfaces. Otherwise the application of electric current leads to a proportional mechanic deformation. In sensor applications the direct piezoelectric effect and in actuator applications the inverse piezoelectric effect is used. Under electronic aspects the piezofilm is a capacitor that reacts on a change of applied force with a proportional change in electric charge. Piezoelectric materials are anisotropic. This means, that their electrical and mechanical properties vary upon the direction of applied force, strain or electrical field.
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