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Device and method for monitoring fluid in subsea equipment

  • US 9,778,182 B2
  • Filed: 05/07/2013
  • Issued: 10/03/2017
  • Est. Priority Date: 05/07/2013
  • Status: Active Grant
First Claim
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1. A monitoring device for monitoring a fluid in subsea equipment, comprising:

  • a plurality of radiation sources;

    a control unit configured to one of (i) shut down at least one radiation source of the plurality of radiation sources when no monitoring of fluid to detect evanescent field effects is desired and (ii) operate the at least one radiation source in a standby mode when monitoring of fluid to detect evanescent field effects is undesired, and configured to turn on each of the plurality of radiation sources one after another;

    a sensing element in contact with the fluid and communicating with the radiation source via at least one first transmission line;

    a plurality of detectors communicating with the sensing element via an optical splitter and a plurality of second transmission lines; and

    a waveguide operatively coupled to the at least one first transmission line and the at least one second transmission line;

    wherein the sensing element forms a region of the waveguide, which is at least partially free of a cladding;

    wherein the plurality of detectors are configured to detect at least one attenuated optical signal fed into the waveguide by at least one radiation source of the plurality of radiation sources, the attenuation being caused by evanescent field absorption by the fluid.

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