Temperature-dependent characteristics of a density sensor based on Lamb waves generated with a P(VF/sub 2/-VF/sub 3/) film

Abstract

We present the temperature-dependent characteristics of a Lamb wave device used as a liquid density sensor. Its fabrication process was simplified using a P(VF/sub 2/-VF/sub 3/) film stuck on a non-piezoelectric medium. The lowest order antisymmetric Lamb waves (A/sub 0/ mode) are used for measurements. We measured the phase and group velocities of the waves for different concentrations of NaCl and we analyzed the temperature dependent performance of our device. The synchronism frequency decreases almost 1.4 kHz per Celsius degree increase. Insertion loss decreases with increasing temperature.