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J. Toledo, V Ruiz-Díez, J.L. Sànchez-Rojas, G. Pfusterschmied, M. Schneider, U. Schmid:
"Wine Fermentation Sensor Based on Piezoelectric Resonators";
Talk: IEEE Sensors 2017, Glasgow, Schottland; 10-29-2017 - 11-01-2017; in: "IEEE Sensors 2017 - Proceedings", IEEE, (2017), ISBN: 978-1-5090-1012-7; 1 - 3.

This work presents a novel approach for the realtime
monitoring of a grape must fermentation process with a
piezoelectric MEMS cantilever excited in the 4th order of the roof
tile-shaped mode, demonstrating the accuracy and reliability of
these resonators even in a continuous flow-through configuration.
In order to contribute to the automation and progress of the
winemaking industry, an AlN-based piezoelectric microresonator
was designed and fabricated, serving as a density-viscosity
sensor. The device features high quality factors (e.g. 140 in water
at 560 kHz) and low motional resistance in liquid, allowing to
discriminate variations in density or viscosity for in-line
monitoring of a grape must fermentation, obtaining a remarkable
resolution better than 0.02 mPa·s and 1 mg/ml in viscosity and
density, respectively.

This work presents a novel approach for the realtime
monitoring of a grape must fermentation process with a
piezoelectric MEMS cantilever excited in the 4th order of the roof
tile-shaped mode, demonstrating the accuracy and reliability of
these resonators even in a continuous flow-through configuration.
In order to contribute to the automation and progress of the
winemaking industry, an AlN-based piezoelectric microresonator
was designed and fabricated, serving as a density-viscosity
sensor. The device features high quality factors (e.g. 140 in water
at 560 kHz) and low motional resistance in liquid, allowing to
discriminate variations in density or viscosity for in-line
monitoring of a grape must fermentation, obtaining a remarkable
resolution better than 0.02 mPa·s and 1 mg/ml in viscosity and
density, respectively.