Precision density and viscosity measurement using two cantilevers with different widths

Basit Öğe Kaydı
dc.authorid0000-0002-5818-9737
dc.authorid0000-0003-0635-7169
dc.authorid0000-0003-2123-2938
dc.contributor.authorCakmak, O.
dc.contributor.authorErmek, E.
dc.contributor.authorKilinc, N.
dc.contributor.authorYaralioglu, G. G.
dc.contributor.authorUrey, H.
dc.date.accessioned2019-08-01T13:38:39Z
dc.date.available2019-08-01T13:38:39Z
dc.date.issued2015
dc.departmentNiğde ÖHÜ
dc.description.abstractWe introduce a novel method for fast measurement of liquid viscosity and density using two cantilevers with different geometries. Our method can be used for real-time monitoring in lab on chip systems and offer high accuracy for a large range of densities and viscosities. The measurement principle is based on tracking the oscillation frequencies of two cantilevers with a phase-locked loop (PLL) and comparing with reference measurements with a known fluid. A set of equations and a simple algorithm is developed to relate the density and the viscosity to the frequency shifts of the cantilevers. We found that the effect of the density and the viscosity can be well separated if cantilevers have different widths. In the experiments, two Nickel microcantilevers (widths 25 pm and 100 mu m, length: 200 mu m, thickness: 1.75 mu m) were fully immersed in the liquid and the temperature was controlled. The actuation was using an external electrocoil and the oscillations were monitored using laser Doppler vibrometer. Thus, electrical connections to the cantilevers are not required, enabling measurements also in conductive liquids. The PLL is used to set the phase difference to 900 between the actuator and the sensor. Calibration measurements were performed using glycerol and ethylene glycol solutions with known densities and viscosities. The measurement error with the new method was lower than 3% in density in the range 995-1150 kg/m(3) and 4.6% in viscosity in the range 0.935-4 mPa.s. Based on the signal-to-noise ratio, the minimum detectable difference in the viscosity is 1 mu Pa.s and the density is 0.18 kg/m(3). Further improvements in the range and the accuracy are possible using 3 or more cantilevers with different geometries. (C) 2015 Elsevier B.V. All rights reserved.
dc.description.sponsorshipTUBITAK [111E184, 113S074]
dc.description.sponsorshipThe financial support from TUBITAK Grants 111E184 and 113S074 are gratefully acknowledged. We thank Prof. Dr. B. Bircher (University of Basel) and Dr. F. Y. Acar (Koc University) for providing help during the reference measurements, Dr. E. Alaca and Koc Univ. Cleanroom Staff for the helps during fabrication.
dc.identifier.doi10.1016/j.sna.2015.05.024
dc.identifier.endpage147
dc.identifier.issn0924-4247
dc.identifier.scopus2-s2.0-84931259629
dc.identifier.scopusqualityQ1
dc.identifier.startpage141
dc.identifier.urihttps://dx.doi.org/10.1016/j.sna.2015.05.024
dc.identifier.urihttps://hdl.handle.net/11480/3893
dc.identifier.volume232
dc.identifier.wosWOS:000361408000016
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthor[0-Belirlenecek]
dc.language.isoen
dc.publisherELSEVIER SCIENCE SA
dc.relation.ispartofSENSORS AND ACTUATORS A-PHYSICAL
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectCantilever
dc.subjectMicrocantilever
dc.subjectViscosity
dc.subjectDensity
dc.subjectMEMS
dc.titlePrecision density and viscosity measurement using two cantilevers with different widths
dc.typeArticle

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