Method for acoustically measuring a fluid flow rate

Details Method for acoustically measuring a fluid flow rate Method for acoustically measuring a fluid flow rate

1998-03-23

2000-09-12

Hoff, Marc S.

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Mechanical measurement system

702 48, G01F 166

Patent

active

061190705

ABSTRACT:
A method for measuring a fluid flow rate between two points of a fluid flow according to which a measurement of the respective propagation times of two acoustic signals transmitted in opposite directions is combined with a measurement of acoustic phase shifts respectively induced in each signal. Each received signal is sampled and digitized and the corresponding acoustic phase shift is determined by synchronous detection. During successive iterations, a programmable phase shift dependent on the value of the acoustic phase shift obtained by synchronous detection in the previous iteration is determined for each iteration, so that the result of the synchronous detection step in the current iteration is as close as possible to zero, and the acoustic phase shift is therefore substantially the same as the last programmable phase shift.

REFERENCES:
patent: 4345479 (1982-08-01), Loveland
patent: 4372166 (1983-02-01), Loveland
patent: 4509372 (1985-04-01), Mount
patent: 5035147 (1991-07-01), Woodward
patent: 5178018 (1993-01-01), Gill

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