Microcantilever Sensors for Petrochemical Applications

Schilowitz, Alan M.

doi:10.1002/9781118723111.ch11

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2015

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“…The measurement of rheological properties, like fluid viscosity, is of common interest in several science fields, ranging from engineering to biology, with applications including process control [ 1 , 2 , 3 , 4 ] and fluids’ analysis for diseases diagnosis [ 5 , 6 , 7 ]. On the other hand, atomic force microscopy (AFM) has became a valuable technique that is applied transversely to scientific disciplines.…”

Section: Introductionmentioning

confidence: 99%

High Resolution Viscosity Measurement by Thermal Noise Detection

Sandoval

Sepúlveda

Bellon

et al. 2015

Sensors

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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.

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