Clamp-on steam/gas flow meter
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United States of America Patent
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-
Sep 30, 2003
Grant Date -
N/A
app pub date -
Mar 31, 2000
filing date -
Apr 1, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A clamp-on ultrasonic measurement system for a gas or other fluid typically of low acoustic impedance such as low pressure steam or flare gas. The system includes a first ultrasonic signal transducer which clamps to the conduit, and a second ultrasonic signal transducer clamped on the conduit across from the first transducer. Each transducer is operated to transmit to, and receive from, the other along contrapropagation signal paths. The transducers generate a shear wave signal that skips within the conduit wall to coherently energize a region of the wall and launch ultrasonic signal energy at a defined angle across the direction of flow. The receiver is symmetrically arranged and positioned to respond to signal energy received along the path through the fluid.
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