Method and apparatus for simultaneous determination of fluid mas

Details Method and apparatus for simultaneous determination of fluid mas Method and apparatus for simultaneous determination of fluid mas

1982-10-07

1984-09-11

Kreitman, Stephen A.

Measuring and testing

Specific gravity or density of liquid or solid

7386137, G01N 900, G01F 186

Patent

active

044702949

ABSTRACT:
This invention relates to a new method and new apparatus for determining fluid mass flowrate and density. In one aspect of the invention, the fluid is passed through a straight cantilevered tube in which transient oscillation has been induced, thus generating Coriolis damping forces on the tube. The decay rate and frequency of the resulting damped oscillation are measured, and the fluid mass flowrate and density are determined therefrom. In another aspect of the invention, the fluid is passed through the cantilevered tube while an electrically powered device imparts steady-state harmonic excitation to the tube. This generates Coriolis tube-damping forces which are dependent on the mass flowrate of the fluid. Means are provided to respond to incipient flow-induced changes in the amplitude of vibration by changing the power input to the excitation device as required to sustain the original amplitude of vibration. The fluid mass flowrate and density are determined from the required change in power input. The invention provides stable, rapid, and accurate measurements. It does not require bending of the fluid flow.

REFERENCES:
patent: 3080750 (1963-03-01), Wiley
patent: 3261205 (1966-07-01), Sipin
patent: 3608374 (1971-09-01), Miller
Report on Blood Flow Measurement, phase 1 report, A. J. Sipin, Apr. 1964, pp. 1-9.

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