NDLI: Vibrating Fluid Densimeters: A Solution to the Viscosity Problem

Content Provider	IEEE Xplore Digital Library
Author	Wenger, Alfred P.
Copyright Year	1964
Abstract	The natural frequency of a resonator immerged in a fluid is density dependent. A major disadvantage of densimeters based on this principle is their poor accuracy for viscous fluids. We solve this difficulty by making an automatic control of the physical phase at which the resonator oscillates. This is done by a modulation technique which, additionally, gives the quality factor and, therefore, the viscosity in digital form. To discover what this physical phase should be and what the factors affecting it are, we made a detailed analytical and numerical study of the vibration of resonators in a viscous fluid. Two densimeters have been built using these results. Their density x viscosity span is 10-100 times larger than that of commercially available instruments of the wholly immersed type. This instrument has achieved an accuracy of ± 0.1 percent.
Starting Page	247
Ending Page	253
Page Count	7
File Size	1887082
File Format	PDF
ISSN	00189421
Volume Number	IECI-27
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1980-08-01
Publisher Place	New York, U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Viscosity Instruments Resonance Impedance Vibrations Resonant frequency Digital modulation Q factor Liquids Automatic control
Content Type	Text
Resource Type	Article
Subject	Engineering

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