Pulse echo technique for detecting fluid flow

Details Pulse echo technique for detecting fluid flow Pulse echo technique for detecting fluid flow

1989-12-11

1991-07-16

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

73155, 340606, 367 93, G01F 166, G01N 2902, E21B 1410

Patent

active

050314670

ABSTRACT:
A method and apparatus for detecting fluid flow behind an acoustically reflective structure using pulse echo techniques which do not depend upon measurement of a Doppler effect. A transducer is provided for generating a high frequency beam of acoustical energy in the form of pulses. The transducer is placed proximate, preferably adjacent, the reflective structure such that the acoustic beam is directed toward such structure. A transducer is also provided for detecting the acoustic reflections of the pulses, proximate the position from which the pulses originated, and generating corresponding electrical signals. An electric circuit is provided for subtracting a pair of acoustic reflection signals separated by a short interval of time to produce a difference signal from which the presence or absence of fluid flow behind the acoustically reflective surface can be determined. In the preferred embodiment, a preselected number of the difference signals are "stacked" by adding the absolute values of such signals to produce a "stacked" signal trace which is more susceptible to evaluation, especially for determination of relative flow velocities.

REFERENCES:
patent: 3369626 (1968-02-01), Zemanek, Jr.
patent: 3776032 (1973-12-01), Vogel
patent: 4744367 (1988-05-01), Kodama et al.
patent: 4790321 (1988-12-01), Miwa et al.
patent: 4803990 (1989-02-01), Bonnefous et al.
patent: 4944189 (1990-07-01), Nakajima et al.

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