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A high-temperature fiber sensor using a low cost interrogation scheme.

David Barrera1, Salvador Sales

  • 1Institute of Telecommunications and Multimedia Applications (iTEAM), Universitat Politècnica de València, Valencia, Spain. dabarvi@iteam.upv.es

Sensors (Basel, Switzerland)
|September 7, 2013
PubMed
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Regenerated Fiber Bragg Gratings (RFBGs) offer potential for high-temperature monitoring. Their unique dual-resonance temperature response enables low-cost interrogation using optical filters, improving sensitivity.

Area of Science:

  • Optical Engineering
  • Materials Science
  • Sensor Technology

Background:

  • High-temperature monitoring is crucial in various industrial applications.
  • Traditional Fiber Bragg Gratings (FBGs) face limitations in extreme environments.
  • Regenerated Fiber Bragg Gratings (RFBGs) present a promising alternative for robust sensing.

Purpose of the Study:

  • To investigate the inscription and regeneration of FBGs in high-birefringence optical fiber.
  • To characterize the temperature response of the resulting RFBGs.
  • To develop and analyze an optical filter-based interrogation system for RFBGs.

Main Methods:

  • Inscription and regeneration of FBGs in high-birefringence optical fiber.
  • Characterization of RFBG Bragg resonances for slow and fast axes under varying temperatures.

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  • Design and simulation of optical filters (ideal and modal interferometers) for wavelength-to-power conversion.
  • Analysis of the interrogation scheme's sensitivity and limitations.

    • Main Results:

    • RFBGs exhibit two distinct Bragg resonances (slow and fast axis) sensitive to temperature.
    • Increasing temperature reduces the spectral separation between the two resonances.
    • An optical filter-based interrogation system effectively converts wavelength shifts to optical power changes.
    • Modal interferometers show potential for tunable filtering, enhancing sensitivity.

    Conclusions:

    • RFBGs are suitable for high-temperature monitoring applications.
    • The reduced resonance separation at higher temperatures facilitates low-cost interrogation.
    • Optical filter design is critical for linearizing and improving the sensitivity of RFBG-based sensors.