Karman's vortex flow meter
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United States of America Patent
Stats
-
Nov 20, 1990
Grant Date -
N/A
app pub date -
Dec 4, 1989
filing date -
Dec 5, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A Karman vortex flow meter comprises a vortex generating post 4 disposed in a fluid conduit 1, a plurality of ultrasonic wave transmitters 6a, 6b provided in a wall of the conduit downstream of the post, and an ultrasonic wave receiver 8 provided in a wall of the conduit opposing the transmitters. The transmitters are either juxtaposed at a horizontal sectional face of the conduit and generated ultrasonic waves simultaneously toward the receiver, or they are provided in series in an axial direction of the conduit while the receiver is provided opposite the transmitter on the downstream side. In the latter embodiment the transmitters are connected to a change-over circuit which switches from the downstream transmitter to the upstream one when the detected frequency of the Karman vortex streets in the fluid exceeds a predetermined value.
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