Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1986-12-11
1988-01-05
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
G01F 132
Patent
active
047167700
ABSTRACT:
A vortex flow meter for measuring the flow velocity of a fluid in a conduit includes a bluff body disposed in the flow passage of the conduit. The bluff body generates Karman vortices whose recurrence frequency is characteristic of the flow velocity to be measured. In the bluff body a cavity is formed which via passages communicates with the flow passage of the conduit and in the cavity a capacitive vortex sensor is disposed which converts the vortex pressure fluctuations originating from the Karman vortices to capacitance changes. The capacitive vortex sensor includes a first oscillating body in the form of a sensor sleeve which is deflectable by the vortex pressure fluctuations and an electrode holder which is disposed in the sensor sleeve and is formed as second oscillating body but is uncoupled from the vortex pressure fluctuations. The electrode holder carries at least one capacitor electrode which with an opposite electrode portion of the sensor sleeve forms a measured capacitance which varies on the deflections of the sensor sleeve relatively to the electrode holder caused by vortex pressure fluctuations. However, vibrations generated by external interfering influences cause similar deflections of the two oscillating bodies and thus do not result in any capacitance changes. The capacitive vortex sensor is thus insensitive to external vibrations and other interfering influences.
REFERENCES:
patent: 3927566 (1975-12-01), Zanker
patent: 4186599 (1980-02-01), Frick
patent: 4362061 (1982-12-01), Yokogawa et al.
patent: 4627295 (1986-12-01), Matsubara et al.
Flowtec AG
Goldstein Herbert
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