Measuring and testing – Specific gravity or density of liquid or solid
Patent
1987-03-05
1989-01-10
Levy, Stewart J.
Measuring and testing
Specific gravity or density of liquid or solid
G01N 900
Patent
active
047964685
ABSTRACT:
Apparatus for use in measuring fluid density comprises a fluid carrying helical sample tube 50 made of a conductive material for passing current therethrough. A cylindrical coil fixing sleeve 58 form surrounds the helical sample tube and engages the tube to prevent relative movement of the turns. A high flux permanent magnet 60 is carried on one post 54 and is aligned along the axis of the tube. The magnetic field established by magnet 60 and the pole extension 64 will subject each current-carrying length element of the sample tube to an axial force, the sum of these forces resulting in a bodily axial movement of the sample tube. The sample tube is excited to spring resonance by passing current through the sample tube. The resonant frequency is measured and is indicative of the mass of the fluid contained in the coil and thereby of the fluid density.
REFERENCES:
patent: 4655075 (1987-04-01), Albert et al.
V. J. Matveev et al., "Cryogenic Vibration Densitometer", Measurement Techniques, vol. 26, No. 8, Aug. 1983, pp. 664-667.
Blake-Coleman Barry
Clarke David
Bell Robert P.
Levy Stewart J.
Public Health Laboratory Service Board
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