High Resolution Viscosity Measurement by Thermal Noise DetectionReport as inadecuate

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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

Abstract 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

Author: Felipe Aguilar Sandoval 1,†,* , Manuel Sepúlveda 1,†, Ludovic Bellon 2,† and Francisco Melo 1,†,*

Source: http://mdpi.com/


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