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Multiple spectrum channel, multiple sensor fiber optic monitoring system

  • US 9,759,836 B2
  • Filed: 07/12/2016
  • Issued: 09/12/2017
  • Est. Priority Date: 09/20/2011
  • Status: Active Grant
First Claim
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1. A method of measuring at least one parameter in a region of interest, comprising:

  • launching an optical pulse into an optical fiber deployed in a wellbore formed in the region of interest, the optical fiber having a plurality of first fiber optic sensors and a plurality of second fiber optic sensors disposed along its length, wherein each of the first fiber optic sensors generates a first spectral response to the optical pulse in a first optical spectrum window, and wherein each of the second fiber optic sensors generates a second spectral response to the optical pulse in a second optical spectrum window different than the first optical spectrum window;

    measuring the first spectral responses in a first optical spectrum channel having a first optical bandwidth sufficient for the first optical spectrum window;

    measuring the second spectral responses in a second optical spectrum channel having a second optical bandwidth sufficient for the second optical spectrum window,the measured first and second spectral responses providing indications of at least one parameter in the region of interest, and the first optical bandwidth being narrower than the second optical bandwidth; and

    processing the measured first spectral responses and second spectral responses to derive the indications of the at least one parameter in the region of interest, wherein the measured first spectral responses are processed to derive indications of temperature in the region of interest, and the measured second spectral responses are processed to derive indications of pressure in the region of interest.

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