Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1991-09-30
1993-02-16
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
G01F 132
Patent
active
051860562
ABSTRACT:
A vortex flowmeter comprises a vortex generating bluff body disposed across a flow passage, a first vortex sensing planar member disposed downstream of and parallel to the bluff body across a first half of the cross section of the flow passage, and a second vortex sensing planar member disposed downstream of and parallel to the bluff body across a second half of the cross section of the flow passage opposite to the first half thereof, wherein the leading edges of the first and second vortex sensing planar members are offset from one another by a distance generally equal to a half wave length of the sinuating streamlines created by the vortices generated by the bluff body; wherein two fluctuating electrical signals respectively generated by the first and second vortex sensing planar members are combined in such a way that the noise generated by the mechanical vibration of the flowmeter body is cancelled therebetween and an alternating output electrical signal representing the vortices is obtained.
REFERENCES:
patent: 3719073 (1976-03-01), Mahon
patent: 3986796 (1976-12-01), Adler et al.
patent: 4986134 (1991-01-01), Lew
patent: 5076105 (1991-12-01), Lew
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