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J. Toledo, T. Manzaneque, V Ruiz-Díez, M. Kucera, G. Pfusterschmied, E Wistrela, W. Steindl, U. Schmid, J.L. Sànchez-Rojas:
"Piezoelectric MEMS Resonators for Density and Viscosity Sensing in Engine Oil with Diesel Fuel";
Talk: Transducers 2015, Anchorage, Alaska, USA; 06-21-2015 - 06-25-2015; in: "Proceedings of the 18th International Conference On Solid State Sensors and Actuators - Transducers 2015", IEEE, (2015), ISBN: 978-1-4799-8955-3; 436 - 439.

This work demonstrates the potential of AlN-based
resonators as on-line sensors for monitor lubricant oil
dilution with diesel. Two devices are compared, one
actuated in the first extensional in-plane mode and the other
in an out-of-plane mode (14-mode). Both devices are
designed to feature high quality factor in liquid, and allow
discriminating variations in density or viscosity in the
medium. Sensor resolutions for these two variables are
compared in lubricant oil SAE 2.5W, and the device with
the best result (14-mode) was also tested in continuous-flow
measurements, showing a resolution of 0.5 ppm of diesel
contamination in this oil.

This work demonstrates the potential of AlN-based
resonators as on-line sensors for monitor lubricant oil
dilution with diesel. Two devices are compared, one
actuated in the first extensional in-plane mode and the other
in an out-of-plane mode (14-mode). Both devices are
designed to feature high quality factor in liquid, and allow
discriminating variations in density or viscosity in the
medium. Sensor resolutions for these two variables are
compared in lubricant oil SAE 2.5W, and the device with
the best result (14-mode) was also tested in continuous-flow
measurements, showing a resolution of 0.5 ppm of diesel
contamination in this oil.

Microresonators, piezoelectric, density, viscosity, rheology, AlN, lubricant oil, oscillator circuits