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Fiberoptic systems and methods detecting EM signals via resistive heating

  • US 9,273,548 B2
  • Filed: 10/10/2012
  • Issued: 03/01/2016
  • Est. Priority Date: 10/10/2012
  • Status: Active Grant
First Claim
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1. A formation conductivity sensor that comprises:

  • a transmitter that radiates electromagnetic energy into a subsurface formation;

    a receiver having;

    one or more loops of an optical fiber thermally coupled to a surrounding conductive element to yield an optically-detectable thermal response to electromagnetic energy from the formation, said electromagnetic energy inducing an electrical current in the conductive element along the one or more loops and through an electrical short across the ends of the one or more loops, and said thermal response resulting from the electrical current; and

    an optical source and optical detector that measure said thermal response; and

    a processing unit that derives a measure of formation conductivity from said thermal response.

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