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Detecting broadside acoustic signals with a fiber optical distributed acoustic sensing (DAS) assembly

  • US 10,139,269 B2
  • Filed: 08/15/2017
  • Issued: 11/27/2018
  • Est. Priority Date: 12/15/2011
  • Status: Active Grant
First Claim
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1. A distributed fiber optic acoustic sensing system comprising:

  • a towed streamer cable having a cable length, the towed streamer cable comprising;

    an elongated body having an outer surface;

    at least one straight optical fiber extending parallel to a longitudinal axis of the towed streamer cable along the cable length; and

    at least one helically wrapped optical fiber extending along the cable length and having a first predetermined wrap angle; and

    light transmitting and receiving means optically connected to said at least one straight optical fiber and the least one helically wrapped optical fiber for, respectively, transmitting optical signals into each of the at least one straight and at least one helically wrapped optical fibers and receiving a backscattered component of said signals out of the at least one straight and at least one helically wrapped optical fibers.

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