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Publication numberWO2005114138 A3
Publication typeApplication
Application numberPCT/US2004/012546
Publication date26 Jan 2006
Filing date22 Apr 2004
Priority date22 Apr 2004
Also published asDE112004002772T5, US7552619, US20070144240, WO2005114138A2, WO2005114138A8
Publication numberPCT/2004/12546, PCT/US/2004/012546, PCT/US/2004/12546, PCT/US/4/012546, PCT/US/4/12546, PCT/US2004/012546, PCT/US2004/12546, PCT/US2004012546, PCT/US200412546, PCT/US4/012546, PCT/US4/12546, PCT/US4012546, PCT/US412546, WO 2005/114138 A3, WO 2005114138 A3, WO 2005114138A3, WO-A3-2005114138, WO2005/114138A3, WO2005114138 A3, WO2005114138A3
InventorsJeffrey C Andle
ApplicantBiode Inc, Jeffrey C Andle
Export CitationBiBTeX, EndNote, RefMan
External Links: Patentscope, Espacenet
Measurements of density and viscoelasticity with a single acoustic wave sensor
WO 2005114138 A3
Abstract
A sensor, method and system, for measuring certain characteristics of a fluid. The sensor utilizes a piezoelectric device having at least two tightly coupled resonators providing a two pole electric transfer function responsive to an electrical signal coupled to the input resonator. The piezoelectric sensor has a textured entrapment layer, constructed to entrap a known volume of fluid and impart motion to the entrapped fluid as well as to surrounding non-trapped fluid. The common mode frequency shift of the two resonant frequencies is related to mass loading due to the entrapped fluid, while the energy absorbed by the fluid, or a phase shift of one of the resonant frequencies, is related to the viscosity/density product of the fluid. Extracting the viscosity is a matter of mathematical manipulation. By controlling the energy level of the input electrical signal, the viscosity measurement may be conducted at a predetermined shear rate.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US4513261 *12 May 198323 Apr 1985Trw Inc.Low-loss acoustic wave filter device
US4731595 *24 Jan 198615 Mar 1988Rf Monolithics, Inc.Resonator structure
US5932953 *30 Jun 19973 Aug 1999Iowa State University Research Foundation, Inc.Method and system for detecting material using piezoelectric resonators
US6255915 *10 May 19993 Jul 2001Research In Motion LimitedDifferential surface acoustic wave filter having balanced outputs
US6543274 *22 Sep 19998 Apr 2003Robert Bosch GmbhSensor array and method for determining the density and viscosity of a liquid
Classifications
International ClassificationG01N11/16, G01N9/24, G01N9/00
Cooperative ClassificationG01N11/16, G01N2291/02827, G01N9/24
European ClassificationG01N11/16, G01N9/24
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