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FIBER OPTIC BIREFRINGENT THERMOMETER AND METHOD FOR MANUFACTURING THE SAME

  • US 20130121374A1
  • Filed: 01/07/2013
  • Published: 05/16/2013
  • Est. Priority Date: 07/07/2010
  • Status: Abandoned Application
First Claim
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1. A fiber optic thermometer comprising:

  • a light source assembly configured to generate light in a first spectral range and in a second spectral range, the first spectral range differing from the second spectral range;

    a single-mode transmission fiber connected to the light source assembly and configured to carry the light of the first and second spectral ranges;

    a polarizer configured to polarize light from the transmission fiber;

    a polarization maintaining sensing fiber having first and second birefringence axes, wherein a birefringence of the sensing fiber between the first and second birefringence axes depends on a temperature to be measured, and the polarizer is configured to couple light from the light source into both the birefringence axes, the sensing fiber having a first end and a second end, and the polarizer being arranged between the transmission fiber and the first end;

    a reflector arranged at the second end of the sensing fiber and configured to reflect light back into the sensing fiber;

    a detector assembly configured to detect light returning from the sensing fiber through the polarizer and the single-mode transmission fiber, wherein the detector assembly is configured to generate a first signal A indicative of an intensity of returning light in the first spectral range and a second signal B indicative of an intensity of returning light in the second spectral range; and

    processing circuitry configured to generate a temperature signal from the first signal A and the second signal B,wherein the processing circuitry is configured to calculate a temperature signal S from the first signal A and the second signal B that is an unambiguous function of the temperature over a desired temperature range.

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