G - Physics – 01 – V
Patent
G - Physics
01
V
349/39
G01V 9/02 (2006.01) E21B 47/10 (2006.01) G01F 1/66 (2006.01) G01N 29/032 (2006.01) G01P 5/24 (2006.01)
Patent
CA 2031944
T-8360 DRS:VS PULSE ECHO TECHNIQUE FOR DETECTING FLUID FLOW Abstract of the Disclosure A method and apparatus for detecting fluid flow behind an acousti- cally reflective structure using pulse echo technique which do not depend upon measurement of a Doppler effect. A transducer is provided for gener- ating 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 gener- ating corresponding electrical signal. 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 signal to produce a "stacked" signal trace which is more susceptible to evaluation, especially for determination of relative flow velocities.
Shell Canada Limited
Smart & Biggar
LandOfFree
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