Method of and apparatus for measuring flow velocity by using ultrasonic waves
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United States of America Patent
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Jun 5, 1990
Grant Date -
N/A
app pub date -
Mar 21, 1988
filing date -
Mar 27, 1987
priority date (Note) -
Expired
status (Latency Note)
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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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