Acoustic flow sensor

Details Acoustic flow sensor Acoustic flow sensor

2007-04-10

2007-04-10

Patel, Harshad (Department: 2855)

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

C073S597000, C073S610000

Reexamination Certificate

active

11163164

ABSTRACT:
A fluid flow sensor uses pairs of acoustic transducers to generate quasi-helical acoustic beams reflected multiple times from an inside surface of a pipe. The transducers are arranged so that each two pairs generate counter-rotating beams. When fluid flowing in the pipe has both a rotary and an axial flow component the rotary component adds to the apparent flow rate measured in one rotational direction and subtracts from that measured in the other. Hence, a combination of transit time measurements along the two paths can be used to cancel out the effects of the rotary flow component and yield a measure of the rate of flow along the pipe axis. In some cases multiple probes are used to increase the amount of flowing fluid that is sampled.

REFERENCES:
patent: 6973842 (2005-12-01), Feller
patent: 7044000 (2006-05-01), Feller
Lynnwood, Lawrence C., Ultrasonic Measurements for Process Control, 1989, pp. 292-294 and related bibligraphic citations, Academic Press Inc., San Diego CA.

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