Ultrasonic flowmeter

Details Ultrasonic flowmeter Ultrasonic flowmeter

1981-12-10

1984-05-08

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

7386129, G01F 166

Patent

active

044467443

ABSTRACT:
An ultrasonic flowmeter arrangement has a pair of electroacoustic transmit/receive transducers located in opposite walls of a pipe, the transducers being longitudinally displaced and facing one another, thus forming a bidirectional transmission path oblique to the direction of fluid flow in the pipe. Each transducer is driven by a voltage controlled oscillator operating sometimes at nominally the same frequency. In one case the oscillator outputs are divided down separately to provide two different transmission frequencies. Filters apply to phase comparison means corresponding transmitted and received frequencies. The outputs of the phase comparison means provide feedback control signals for the oscillators. The oscillator outputs are fed to a mixing means to derive a difference frequency signal as a measure of the rate of fluid flow in the pipe.

REFERENCES:
patent: 2912856 (1959-11-01), Kritz
patent: 3007339 (1961-11-01), Hill
patent: 4069713 (1978-01-01), Gassmann
J. L. McShane, "Flow, Its Measurement and Control in Science & Industry", vol. 1, Part II, 1974, pp. 897-913.
Lynch et al.-"Flow Measurement with a New Ultrasonic Flowmeter"-Flow, Its Measurement and Control in Science & Industry, vol. 1, Part II, 1974, pp. 925-931.

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