Vortex flowmeter

Details Vortex flowmeter Vortex flowmeter

1996-08-22

1998-04-07

Chilcot, Richard

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

7386122, G01F 132

Patent

active

057366497

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.

REFERENCES:
patent: 4815324 (1989-03-01), Tada et al.
patent: 4932382 (1990-06-01), Fujimoto et al.
patent: 4966040 (1990-10-01), Ohmae
patent: 4977781 (1990-12-01), Misumi et al.
patent: 5020373 (1991-06-01), Kamiunten et al.

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