Measurement of the density of liquids

Details Measurement of the density of liquids Measurement of the density of liquids

1979-08-08

1980-12-23

Gill, James J.

Measuring and testing

Specific gravity or density of liquid or solid

73290V, G01N 900, G01F 2328

Patent

active

042402859

ABSTRACT:
A device for measuring the density of a liquid relies on the generation of resonant modes in a torsional vibration set up in a paddle which is immersed in the liquid. The frequency at which a resonance mode, usually a fundamental, is produced is a function of the density of the liquid. A feedback circuit is described which varies the frequency of an oscillator producing the vibrations so as to enable the frequency at which the resonance mode exists to be automatically found. Transducers for generating and detecting the torsional vibration are located at one end of a rod above the surface of the liquid, and the paddle is mounted on the other end of the rod.

REFERENCES:
patent: 2354923 (1944-08-01), McNamee
patent: 3225588 (1965-12-01), Moulin et al.
patent: 3690147 (1972-09-01), Kuenzler
patent: 4129031 (1978-12-01), Tehon et al.

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