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FIBER OPTIC DISTRIBUTED ACOUSTIC MEASUREMENTS VIA FMCW INTERROGATION

  • US 20150085610A1
  • Filed: 08/19/2014
  • Published: 03/26/2015
  • Est. Priority Date: 09/25/2013
  • Status: Abandoned Application
First Claim
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1. A system to obtain acoustic information from a borehole penetrating the earth, the system comprising:

  • a light source configured to provide a continuous output beam over a selected period of time;

    a modulator configured to modulate the continuous output beam with a modulation signal to provide a frequency modulated continuous wave (FMCW) to be sent out on an optical fiber disposed along the borehole, the optical fiber including a plurality of reflectors at known locations along the optical fiber; and

    a processor configured to process a light reflection signal from the optical fiber to determine the acoustic information.

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