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- W3145521888 abstract "The effects of a finite polarizability of a liquid sample onto the series resonance frequency of a piezoelectric resonator are described within the small-load approximation. It is found that the sample's electrical capacitance (the ratio of surface potential and surface polarization at the crystal surface) enters the motional branch of the equivalent circuit, thereby shifting the series resonance frequency. This effect comes about by piezoelectric stiffening. Using a conventional quartz crystal with small hole in the front electrode and exposing this crystal to a variety of different liquids, we demonstrate that derived equation describes the experiment reasonably well. Electric and dielectric effects are particularly strong for torsional resonators, which operate at a frequency of around 56 kHz. These are in commercial use for determination of the viscosity of engine oils. We propose a simple method to insitu switch the strength of piezoelectric stiffening. The technique is based on a pair of wires around the crystal, which-if connected to each other-shield the environment from the electric field emanating from the crystal. Closing the switch therefore reduces the overall energy the strain-induced electric field, which reduces the effective stiffness of the crystal and, in consequence, the resonance frequency. This simple device allows to separate the viscoelastic parameters from the polarizability. It could, for instance, be used to differentiate between gasoline and water being accidentally admitted to the lubricant reservoir. The instrument requires a single resonator and is based on the determination of two frequency shifts, only." @default.
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- W3145521888 date "2009-04-01" @default.
- W3145521888 modified "2023-09-25" @default.
- W3145521888 title "Simple frequency-based sensing of viscosity and dielectric properties of a liquid using acoustic resonators" @default.
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- W3145521888 doi "https://doi.org/10.1109/freq.2009.5168308" @default.
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