This paper investigates an ultrasonic densitometer capable of measuring the densities of liquids. Lynnworth originally proposed an ultrasonic densitometer operating in pulse-echo mode. This instrument makes use of the phase velocity of a torsional elastic wave pulse traveling in a noncircular waveguide immersed in a liquid to indicate the density of the liquid under investigation. In this paper a second mode of operation is proposed by making use of a continuously excited torsional wave to reveal liquid density. An important advantage of this mode of operation is the larger cross-sectional dimensions possible without sacrificing performance degradation which might result from wave dispersion. The theory of this mode of operation is described and used to construct a densitometer. Densities of a few liquids are measured and compared to the theoretical values.
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September 1998
September 01 1998
The analysis and results of a continuous wave ultrasonic densitometer
Christian C. J. Smit;
Christian C. J. Smit
Department of Electrical and Electronic Engineering, University of Pretoria, Pretoria, South Africa
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Edwin D. Smith
Edwin D. Smith
Department of Electrical and Electronic Engineering, University of Pretoria, Pretoria, South Africa
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J. Acoust. Soc. Am. 104, 1413–1417 (1998)
Article history
Received:
July 25 1997
Accepted:
March 11 1998
Citation
Christian C. J. Smit, Edwin D. Smith; The analysis and results of a continuous wave ultrasonic densitometer. J. Acoust. Soc. Am. 1 September 1998; 104 (3): 1413–1417. https://doi.org/10.1121/1.424351
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