Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1988-03-21
1990-06-05
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
G01F 166
Patent
active
049303589
ABSTRACT:
The present invention relates to a method of and an apparatus for measuring flow velocity by using ultrasonic waves. Sound velocities of wedge portions constituting ultrasonic transducers provided at the upstream and the downstream sides of a piping, respectively, are measured, and the ultrasonic wave is oscillated from the upstream side to the downstream side and from the downstream side to the upstream side, respectively, and propagated in a fluid in the piping and respective times from the oscillating to receiving are measured. These measured values are substituted into a predetermined function and calculated, to thereby search the flow velocity of the fluid in the piping. Each of the ultrasonic transducers is connected thereto with a transmission-reception changeover section, a timer device for measuring a propagation time, during which the ultrasonic wave is propagated in the fluid in the piping and received, and an operational device for processing output data, which is delivered from the timer device in a predetermined manner. An opening length of the ultrasonic transducer in contact with the piping is about 15 wave lengths or more of a center frequency used, whereby the ultrasonic waves become parallel beams, so that an angle of directivity becomes small.
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Ultrasonic Flowmeters, by J. L. McShane, Flow, Its Measurement and Control in Science and Industry-vol. 1, Part II, 1974.
Motegi Ryohei
Sato Toshio
Takeuchi Shinichi
Ruehl Charles A.
Tokyo Keiki Co. Ltd.
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