Measuring Liquid Density with a Tuning-Fork Transducer

This paper describes a microcomputer-controlled measurement system for continuous measurement of the density of a streaming liquid. The system utilizes a transducer that resembles a hollow tuning fork filled with liquid. The resonant frequency of the fundamental mode of this device is a function of...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 1983-09, Vol.32 (3), p.434-437
Main Authors: Stemme, Erik, Ekelof, Jorgen, Nordin, Leif
Format: Article
Language:English
Subjects:
Algorithms
Density measurement
Exact sciences and technology
Frequency conversion
Mass and density
Measurements common to several branches of physics and astronomy
Metrology, measurements and laboratory procedures
Microcomputers
Physics
Piezoelectric materials
Piezoelectric transducers
Resonance
Resonant frequency
Software measurement
Vibrations
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Summary:This paper describes a microcomputer-controlled measurement system for continuous measurement of the density of a streaming liquid. The system utilizes a transducer that resembles a hollow tuning fork filled with liquid. The resonant frequency of the fundamental mode of this device is a function of the liquid density. Piezoelectric means are used to force the device to oscillate and to register the oscillation. A microcomputer controls a frequency sweep, detects the resonant frequency, and converts the frequency to density. Accuracies on the order of 0.05 percent have been recorded in laboratory tests. The system is suitable for industrial applications.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.1983.4315101