Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1983-07-25
1985-07-16
Rowland, James L.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
7386105, G01F 166
Patent
active
045288577
ABSTRACT:
A non-invasive ultrasonic flowmeter which utilizes the phase modulation of an ultrasonic beam transmitted through a fluid carrying conduit to determine the fluid volumetric flow rate. Transmitting and receiving transducer pairs are diametrically disposed on the outside of the conduit. The received signal is filtered, amplified and phase demodulated. In one embodiment dual loop-circuits having different carrier frequencies have their output signals combined in a differential amplifier. Instrumentation such as frequency meters or RMS voltmeters are utilized to measure either the zero-crossing frequency or amplitude, respectively, of the resulting voltage signal. Both of these quantities are nearly linearly related to the fluid flow rate.
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Beers Robert F.
Hansen Henry
Pace Vincent T.
Rowland James L.
Tumm Brian R.
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