Temperature dependence of working characteristics of piezoelectric sensors based on polyvinylidene fluoride

Abstract

It has been found that the piezoelectric sensors produced on the basis of electrified films of polyvinylidene fluoride (PVDF) work reliably in the temperature range from –20°C to +80°C. At the operating temperature of 80°C d₃₃ piezocoefficient decreases by 2% during two years that is permissible. At higher temperatures irreversible reduction of the piezocoefficient was observed. The lowest temperature of the working range is close to the glass transition temperature of the amorphous phase of PVDF. Annealing of the films at 80°C ensures stabile characteristics of the sensors within a few years.