Abstract
Exploration of a gravimetric sensor based on acoustic-wave transmission across thin polymer filters is described. The transit time of the acoustic waves passing across the polymer filters is measured during the filtration process. The variation in transit time is shown to be a direct function of the accumulating mass on the filter surface. The experimental results lie within a range of ±14% of the theoretical values. The piezoelectric polymer PVDF (polyvinylidene fluoride) is used as the transmitter and receiver in this project. A large variety of filters with different pore sizes is commercially available, so the sensor has many possible applications for the real-time detection of the accumulation of mass on filters. For example, applications in the following areas are envisaged: the food industry, hydraulic systems, the environment, medicine, etc.
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