Measuring and testing – Volume or rate of flow – By measuring transit time of tracer or tag
Patent
1993-02-23
1994-10-18
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring transit time of tracer or tag
G01F 1708
Patent
active
053557352
ABSTRACT:
An apparatus for measuring the flow of a liquid through a conduit by observing the transit of an injected gas bubble through the conduit. A gas source, responsive to the pressure of the liquid in the conduit, supplies gas at a predetermined pressure to a gas injector. This allows the gas injectors to inject a predetermined volume of gas into the conduit, largely independent of the absolute pressure of the liquid. An image, produces a conduit image representative of the gas bubble and the liquid in the conduit, comprising a plurality of elements corresponding to a plurality of predetermined locations along the conduit. A timer responsive to the conduit image produces a plurality of transit times substantially equal to the times required for the gas bubble to transit between adjacent predetermined locations. A time analyzer and indicator are included for analyzing the plurality of transit times and indicating the flow of the liquid through the conduit. An image analyzer is also included for analyzing the conduit image to initiate gas bubble injection in response to abnormal conditions. Advantageously, the apparatus may be used as disclosed herein to accurately meter irregular or pulsatile liquid flows.
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Evans Ronald W.
Miller Mark E.
Datrend Systems Inc.
Goldstein Herbert
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