Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1989-05-19
1990-05-15
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
G01F 132
Patent
active
049247107
ABSTRACT:
A vortex flowmeter comprising ultrasonic wave transmitters and ultrasonic wave receivers adapted to receive ultrasonic waves transmitted by the transmitters through a flow of fluid in which vortices are generated by a vortex generator, the ultrasonic wave signals output by the ultrasonic wave receivers being compared by a phase comparator to measure the flow rate of the fluid by detecting the difference in phase of the ultrasonic waves due to generation of the vortices. First and second ultrasonic wave transmitters are disposed on the wall of a pipe line defining the flow path for the fluid downstream of the vortex generator and first and second ultrasonic wave receivers are respectively disposed at positions on the wall of the pipe line opposite to the first and second transmitters and in such a manner that the first propagation route for the ultrasonic waves propagating from the first ultrasonic wave transmitter to the first ultrasonic wave receiver and the second propagation route for ultrasonic waves propagating from the second ultrasonic wave transmitter to the second ultrasonic wave receiver intersect each other and extend in opposite directions. The phase of the respective ultrasonic wave signals output by the first and second ultrasonic wave receivers are compared by a phase comparator so that the vortices generated by the vortex generator can be detected.
REFERENCES:
patent: 3886794 (1975-06-01), McShane
Inada Yutaka
Kawasaki Kazumasa
Nishiyama Shigeru
Yoshikura Hiroshi
Goldstein Herbert
Tokico Ltd.
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