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Techniques for distributed acoustic sensing

  • US 9,250,112 B2
  • Filed: 02/21/2012
  • Issued: 02/02/2016
  • Est. Priority Date: 02/21/2011
  • Status: Active Grant
First Claim
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1. A method of determining flow speed of a fluid within a conduit comprising the steps of:

  • introducing at least one acoustic stimulus into the fluid in the conduit such that a first acoustic stimulus travels in one direction in the conduit and a second acoustic stimulus travels in the opposite direction in the conduit so as to set up standing waves within the fluid;

    interrogating an optical fibre deployed along the length of the conduit to provide a fibre optic distributed acoustic sensor;

    monitoring the acoustic response to the first acoustic stimulus and second acoustic stimulus using said distributed acoustic sensor; and

    using said acoustic response to determine the flow speed of the fluid.

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