Measuring and testing – Volume or rate of flow – By measuring transit time of tracer or tag
Patent
1989-03-06
1990-07-03
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring transit time of tracer or tag
7320423, 604 65, G01F 168
Patent
active
049380796
ABSTRACT:
The apparatus accurately measures flow rate of fluid within a conduit without direct fluid contact, based on the introduction of a thermal marker into the fluid stream by means of at least one externally mounted heater, and detection of the thermal marker by means of at least one externally mounted sensor. The transit time of the thermal marker can be ascertained for transit of the thermal marker from a heater to a sensor, or from one sensor to another sensor. A preferred embodiment of the heater comprises a resonant microwave cavity which heats the fluid radiatively, and a preferred embodiment of the sensor comprises a resonant microwave cavity through which a portion of the fluid conduit passes, the resonant characteristics of said microwave sensor being perturbed by the passage of the thermal marker.
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IVAC Corporation
Ruehl Charles A.
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