Acoustic flowmeter

Details Acoustic flowmeter Acoustic flowmeter

1975-10-23

1977-03-15

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

System

G01F 166

Patent

active

040117553

ABSTRACT:
In the acoustic flowmeter apparatus disclosed herein, repetitively gated bursts of relatively high frequency acoustic energy are transmitted between upstream and downstream transducers in a conduit in which flow is to be measured, the transmission being alternately in an upstream and a downstream direction. The received signals are amplified and subjected to narrow band filtering so as to extract an essentially continuous component at the high frequency, preserving phase information. By measuring the relative phase shifts of the upstream and downstream transmissions, a measurement proportional to flow rate is obtained. In the preferred embodiment, the sum of the transit times is measured by measuring the phase shifts of the principal repetition frequency modulation component of the received signals.

REFERENCES:
patent: 2746291 (1956-05-01), Swengel
patent: 3050997 (1962-08-01), Lake
patent: 3473378 (1969-10-01), Yoshiyama et al.
patent: 3631719 (1972-01-01), Charvier et al.
patent: 3738169 (1973-06-01), Courty
patent: 3935737 (1976-02-01), Lee

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