Measuring and testing – Volume or rate of flow – By measuring transit time of tracer or tag
Patent
1984-12-04
1986-04-15
Woodiel, Donald O.
Measuring and testing
Volume or rate of flow
By measuring transit time of tracer or tag
7386132, 7386177, 331 65, G01F 132
Patent
active
045819432
ABSTRACT:
The disclosed flow sensor includes a pipe segment forming a flow passage, having vanes that cause the entering liquid to spiral in passing through a flow-detection zone. An orbital ball is captive in the zone, orbiting in proportion to the flow velocity. A localized capacitive flow detector and a companion capacitive electrode sense the orbiting of the ball. The capacitive electrodes are coupled to the frequency-determining portion of a feedback-stabilized oscillator whose output is modulated each time the ball travels past the sensing electrode. A feedback-stabilized oscillator having a sensing coil is similarly modulated by the effect of a vaned rotor moving past the coil. Different forms of feedback having a long-time-constant maintain high sensitivity of the oscillator to the effect of the flow-activated device.
REFERENCES:
patent: 3381531 (1968-05-01), Arutjunov et al.
patent: 3443432 (1969-05-01), Shonin et al.
patent: 3455162 (1969-07-01), Michiver et al.
patent: 4157660 (1979-06-01), Spacek
patent: 4324144 (1982-04-01), Miyata et al.
patent: 4462262 (1984-07-01), Kahnke
Wilgood Corporation
Woodiel Donald O.
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