Doppler-type ultrasonic flowmeter

Details Doppler-type ultrasonic flowmeter Doppler-type ultrasonic flowmeter

1981-05-15

1983-07-05

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

7386104, G01F 166

Patent

active

043911498

ABSTRACT:
A Doppler-type ultrasonic flowmeter whose transmitting transducer is excited by an oscillator to project into the meter pipe a diverging beam of ultrasonic energy. The projected beam is reflected by contaminants carried by the fluid lying within the zone in which the projected beam intersects a reception beam converging toward a receiving transducer which picks up the reflected energy. The transmitted signal is mixed with the Doppler signal yielded by the receiving transducer to yield positive and negative beats which are applied to a low-pass filter from which is extracted a band of negative beat frequencies representing the disparate flow velocities of the contaminants within the zone dictated by the prevailing velocity profile of the fluid. This band is subjected to spectral analysis to determine the velocities of the contaminants and their relative percentages, from which the flow profile of the fluid being metered is calculated to ascertain the mean flow velocity thereof.

REFERENCES:
patent: 3208286 (1965-09-01), Richard
patent: 3675192 (1972-07-01), Fahrbach
patent: 3741014 (1973-06-01), Tamura
patent: 3901077 (1975-08-01), McCarty et al.

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