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Systems and Methods for Spread Spectrum Distributed Acoustic Sensor Monitoring

  • US 20160146662A1
  • Filed: 08/12/2013
  • Published: 05/26/2016
  • Est. Priority Date: 08/12/2013
  • Status: Active Grant
First Claim
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1. A system for monitoring regions of interest for occurrences that generate acoustic perturbations, comprising:

  • a. an optical fiber span positioned into a region of interest;

    b. a light source for generating a continuous coherent signal of a pre-determined wavelength into the optical fiber;

    c. a binary code sequence generator driven by a master clock;

    d. an optical modulator having first and second ports for receiving the primary coherent light signal from the light source and a generated binary code from the binary code sequence generator to produce a modulated light signal;

    e. an optical circulator/coupler to receive the modulated light signal from the optical modulator and pass it into the optical fiber span positioned into the region of interest;

    f. a detector system driven by the master clock for de-modulating, correlating, and de-multiplexing returned backscattered Rayleigh signals from the optical fiber span positioned into the region of interest, wherein the detector system has a processor to detect coherent Rayleigh noise generated by the optical fiber span positioned in the region of interest to identify acoustic events in the regions of interest; and

    g. wherein the returned backscattered Rayleigh signals from the optical fiber span positioned into the region of interest are directed to the detector system by the optical circulator/coupler.

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