Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1987-04-17
1988-07-19
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
73658, G01F 132
Patent
active
047577207
ABSTRACT:
A Karman vortex flowmeter for producing a Karman vortex street corresponding to the velocity of a fluid and measuring the flow rate of the fluid by making use of the variations in the pressure caused by the production of the Karman vortex street to cause vibration of a vibrating plate portion of a metal sheet member consisting of a magnetic substance and having first and second magnetic circuit-forming portions to produce a magnetic circuit whose magnetic flux reverses in direction whenever the direction of the vibration of the vibrating plate portion is reversed. Magnets are disposed to magnetize the ends of the vibrating plate portion to different polarities according to the direction of the vibration of the vibrating plate portion and a detecting means detects the inversion of the direction of the magnetic flux caused by the formation of the magnetic circuit and the frequency of flux inversion is used to determine the flow rate of the fluid.
REFERENCES:
patent: 1935445 (1933-11-01), Heinz
patent: 3116639 (1964-01-01), Bird
patent: 4470310 (1984-09-01), Tsuruoka et al.
Goldstein Herbert
Honda Giken Kogyo Kabushiki Kaisha
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