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Sensors 2015, 15(11), 27905-27916;

High Resolution Viscosity Measurement by Thermal Noise Detection

Departamento de Física, Universidad de Santiago de Chile, Avenida Ecuador 3493, Estación Central, Santiago 9170124, Chile
Laboratoire de Physique, Université de Lyon, Ecole Normale Supérieure de Lyon, CNRS, 46 Allée d’Italie, Lyon F-69007, France
These authors contributed equally to this work.
Authors to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 21 September 2015 / Revised: 26 October 2015 / Accepted: 29 October 2015 / Published: 3 November 2015
(This article belongs to the Section Physical Sensors)
Full-Text   |   PDF [806 KB, uploaded 6 November 2015]   |  


An interferometric method is implemented in order to accurately assess the thermal fluctuations of a micro-cantilever sensor in liquid environments. The power spectrum density (PSD) of thermal fluctuations together with Sader’s model of the cantilever allow for the indirect measurement of the liquid viscosity with good accuracy. The good quality of the deflection signal and the characteristic low noise of the instrument allow for the detection and corrections of drawbacks due to both the cantilever shape irregularities and the uncertainties on the position of the laser spot at the fluctuating end of the cantilever. Variation of viscosity below 0.03 mPa·s was detected with the alternative to achieve measurements with a volume as low as 50 µL. View Full-Text
Keywords: thermal fluctuations; viscosity in liquids; MEMS thermal fluctuations; viscosity in liquids; MEMS

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Aguilar Sandoval, F.; Sepúlveda, M.; Bellon, L.; Melo, F. High Resolution Viscosity Measurement by Thermal Noise Detection. Sensors 2015, 15, 27905-27916.

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