Vortex flowmeter
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United States of America Patent
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Apr 7, 1998
Grant Date -
N/A
app pub date -
Aug 22, 1996
filing date -
Aug 23, 1995
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Abstract
In a Karman vortex flowmeter according to the present invention, first and second ultrasonic transmission/reception devices are offset from each other along a flowing direction of fluid, and a switching device alternately switches the ultrasonic transmission/reception devices so that the ultrasonic transmission/reception devices can alternately perform transmission and reception. There is also provided a propagation time difference detector for determining a time difference between an ultrasonic wave propagation time when one of the ultrasonic transmission/reception devices performs the transmission, and an ultrasonic wave propagation time when the other of the ultrasonic transmission/reception devices performs the transmission, and for determining a flow rate of the fluid on the basis of the time difference. When no Karman vortex is generated or when the number of generated Karman vortices is greatly reduced, the minute flow rate of the fluid is measured by the propagation time difference detector.
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