Fluid flow measurement

Details Fluid flow measurement Fluid flow measurement

1984-02-06

1985-12-31

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

With indirect temperature or density compensation

7386124, G01F 132, G01F 186

Patent

active

045613109

ABSTRACT:
An instrument for measuring simultaneously the flow rate and density of a moving fluid includes means for measuring the frequency and amplitude of vortices shed by interaction of the fluid with a bluff body. Typically the sensing means includes an optical fibre movable in response to pressure changes in the fluid. Computation of the mass flow rate of the fluid can be effected.
In one embodiment a light signal from a transmitter (41) is modulated via a sensor (42) and is then fed via a detector (45) and A to D converter (46) to a microprocessor (47) where demodulation and computation of mass flow rate is effected. The microprocessor also provides neative feedback to maintain the output level of the transmitter substantially constant.

REFERENCES:
patent: 1935445 (1933-11-01), Heinz
patent: 3116639 (1964-01-01), Bird
patent: 3719073 (1973-03-01), Mahon
patent: 3776033 (1973-12-01), Herzl
patent: 3888120 (1975-06-01), Burgess
patent: 4048854 (1977-09-01), Herzl
patent: 4206642 (1980-06-01), Bearcroft
patent: 4247764 (1981-01-01), Kissinger
patent: 4281553 (1981-08-01), Datta-Barua
patent: 4433238 (1984-02-01), Adolfsson et al.
patent: 4472022 (1984-09-01), Bearcroft et al.

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