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FBG Spectrum Regeneration by Ni-Coating and High-Temperature Treatment.

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Summary

This study demonstrates that broken fiber Bragg grating (FBG) sensors can be repaired and coated with nickel. These repaired sensors regain a stable, single-peak spectrum after high-temperature cycling, enabling their use in extreme environments.

Keywords:
Fiber Bragg Gratingchirped gratingelectrodepositionhigh-temperature applicationsnickel coatingspectrum regeneration

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Sensor Technology

Background:

  • Fiber Bragg grating (FBG) sensors are crucial for structural integrity monitoring in industrial and scientific applications.
  • Extreme temperatures (high and cryogenic) and fiber brittleness pose significant challenges to FBG sensor performance and longevity.
  • Nickel protective coatings are needed to enhance FBG sensor durability in high-temperature environments.

Purpose of the Study:

  • To investigate the possibility of repairing intentionally broken FBG sensors.
  • To assess the effectiveness of nickel coating in restoring FBG sensor functionality after high-temperature exposure.
  • To analyze the spectral regeneration and stability of repaired FBG sensors.

Main Methods:

  • A commercial FBG sensor was intentionally broken and re-spliced, creating a chirped spectrum.
  • Electrodeposition of a nickel protective coating onto the re-spliced FBG.
  • Subjecting the coated, repaired FBG to multiple thermal cycles up to 800 °C.

Main Results:

  • The re-spliced FBG exhibited a distorted, chirped spectrum initially.
  • After thermal cycling to 700 °C and above, the spectrum stabilized and returned to a single-peak shape.
  • A subsequent 800 °C cycle provided data for estimating the stabilization time of the regenerated spectrum.

Conclusions:

  • Repaired FBG sensors, when protected with nickel coating, can recover their spectral integrity after high-temperature exposure.
  • This technique offers a potential method for salvaging damaged FBG sensors for high-temperature applications.
  • Nickel coating plays a vital role in the stabilization and recovery of FBG sensors under extreme thermal stress.