Ultrasonic flow velocity measuring method
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United States of America Patent
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-
Oct 29, 2002
Grant Date -
Nov 8, 2001
app pub date -
Feb 27, 2001
filing date -
Sep 3, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An ultrasonic flow velocity measuring method using a transit time difference of continuous sine waves without transmitting/receiving an ultrasonic pulse comprises steps of amplitude-modulating a continuous ultrasonic sine wave carrier into a lower frequency and transiting the amplitude-modulated signal, whenever the ultrasonic transit time is measured; demodulating the amplitude-modulated signal; detecting or discriminating the amplitude-modulated signal from the demodulated signal and measuring a time interval from the moment that the ultrasonic sine wave is amplitude-modulated till the amplitude-modulated signal is demodulated.
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