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PHASE SENSITIVE COHERENT OTDR WITH MULTI-FREQUENCY INTERROGATION

  • US 20130113629A1
  • Filed: 10/19/2012
  • Published: 05/09/2013
  • Est. Priority Date: 11/04/2011
  • Status: Abandoned Application
First Claim
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1. An apparatus, comprising:

  • a narrowband optical source to generate a first optical signal having a first optical frequency;

    a frequency-shifting circuit to generate a probe signal from the first optical signal to launch into a fiber optic sensor, the probe signal having a plurality of optical frequencies shifted from the first optical frequency;

    a coherent detection system to mix backscatter signals generated by the fiber optic sensor in response to the probe signal with a local oscillator optical signal provided by the narrowband optical source to generate mixed output signals; and

    a phase detection and acquisition system to filter the mixed output signals into frequency bands corresponding to the shifted frequencies, and to extract at least the phase of the mixed output signal for at least one of the frequency bands.

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