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Apparatus for deriving measurement signals from fibre optic distributed sensors

  • US 9,909,903 B2
  • Filed: 04/06/2012
  • Issued: 03/06/2018
  • Est. Priority Date: 04/08/2011
  • Status: Active Grant
First Claim
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1. A distributed fibre optic sensor apparatus comprising:

  • an optical source, the optical source generating at least first and second optical pulse pairs for launching into an optical fibre, each pulse having a frequency, wherein the first pulses of the pulse pairs have the same frequency and the second pulses of the pulse pairs have the same frequency, andthe pulses generated such that the phase relationship of the pulses of the first pulse pair and the phase relationship of the pulses of the second pulse pair are different by a predetermined relative phase difference wherein;

    the pulses of the first and second pulse pairs have a frequency difference between them; and

    the first and second pulse pairs are generated so as to be launched into the optical fibre at different times;

    such that the time between launch of the first and second pulse pairs corresponds to the time for a relative phase change in a signal at a frequency equal to the frequency difference between the pulses in a pair equal to said predetermined relative phase difference.

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