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Fiber optic cable for distributed acoustic sensing with increased acoustic sensitivity

  • US 9,255,836 B2
  • Filed: 11/30/2011
  • Issued: 02/09/2016
  • Est. Priority Date: 06/17/2010
  • Status: Active Grant
First Claim
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1. A fiber optic cable used for distributed acoustic sensing (DAS), comprising:

  • an outer tube;

    an inner tube surrounded by the outer tube; and

    one or more optical fibers surrounded by the inner tube, wherein the one or more optical fibers have increased acoustic sensitivity compared to a standard optical fiber, wherein at least one of the one or more optical fibers have a smaller diameter compared to the standard optical fiber, and wherein, upon application of pressures created by acoustic waves, the smaller diameter provides for increased response of the fibers when compared to the standard optical fiber.

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