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3B-2 Ultrasonic Density Measurement of Liquids - A Novel Method using a Generalized Singular Value Decomposition based System Identification

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2 Author(s)
Schaefer, R. ; Inst. of Micro & Sensor Syst., Magdeburg Univ. ; Hauptmann, P.

Electrical conductance of an ultrasonic transducer depends on the applied acoustic load. Provided one mechanical port charged with known impedance, and the other port exposed to a fluid, the resulting load is determined by the acoustic impedance of the liquid. This work applies generalized singular value decomposition (GSVD) to determine the transfer function of a pulsed transducer attached to a reference by analyzing the reverberating voltage at the electrical port. The transfer function gives the conductance spectrum as a function of acoustic load. The Butterworth-van-Dyke equivalent circuit is used to derive load impedance from conductance. With acoustic impedance being the product of sound velocity and density, speed of sound recording permits a density measurement of liquids. The proposed method has been successfully tested for water- and oil-based liquids. This work shows experimental results and discusses the influence of temperature and liquid inhomogeneities

Published in:

Ultrasonics Symposium, 2006. IEEE

Date of Conference:

2-6 Oct. 2006