Ultrasonic flow velocity measuring method using phase difference measurements
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United States of America Patent
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May 14, 2002
Grant Date -
Nov 8, 2001
app pub date -
Feb 15, 2001
filing date -
Sep 3, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An ultrasonic flow velocity measuring method comprises a phase difference flow velocity measuring method irrelevant to the change of the sound velocity, if a flow velocity is measured based on a phase difference method without transmitting/receiving an ultrasonic pulse in a river, an open sluice channel or a pile having a large inner diameter, including amplitude-modulating at least one continuous ultrasonic sine waves of a carrier frequench .function..sub.C into signals of an amplitude-modulated frequench .function..sub.M, if at least one phase difference .DELTA..phi..sub.C transited and received in directions similar and contrary to the flow velocity is equal to n.pi.+a.pi., obtaining n.pi., using the signal of the amplitude-modulation .function..sub.M ; and measuring a part of a.pi.<.pi., obtaining the phase difference between the signals of the carrier frequench .function..sub.C and obtaining the total phase differences .DELTA..phi..sub.C precisely.
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