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Distributed High Temperature Monitoring of SMF under Electrical Arc Discharges Based on OFDR.

Chen Chen1, Song Gao1, Liang Chen1

  • 1Department of Physics, University of Ottawa, 25 Templeton Street, Ottawa, ON K1N 6N5, Canada.

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Summary

This study demonstrates high-temperature optical fiber sensing using optical frequency-domain reflectometry (OFDR) to measure electric arc discharges up to 2100°C. The method analyzes Rayleigh spectra to assess fiber softening and mechanical stress during discharges.

Keywords:
Rayleigh backscatteringdistributed temperature sensingoptical fiber sensorsoptical frequency-domain reflectometry

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Sensing Technology

Background:

  • Accurate high-temperature measurement is critical for monitoring extreme environments, such as electric arc discharges.
  • Optical fibers offer a robust sensing solution, but distributed high-temperature measurement under such conditions remains challenging.
  • Optical frequency-domain reflectometry (OFDR) provides high spatial resolution for distributed sensing applications.

Purpose of the Study:

  • To experimentally demonstrate distributed high-temperature measurement of optical fibers subjected to electric arc discharges using OFDR.
  • To analyze the correlation between discharge-induced fiber softening, mechanical stress, and Rayleigh spectral changes.
  • To evaluate the accuracy and reliability of OFDR for dynamic temperature and optical path length measurements during arc events.

Main Methods:

  • Utilizing optical frequency-domain reflectometry (OFDR) for distributed temperature profiling.
  • Employing statistical analysis of Rayleigh spectra correlations to measure fiber softening and mechanical stress.
  • Applying a temporal correlation method for delay shift calculation and a spectral mapping method for optical path length monitoring.

Main Results:

  • Achieved distributed temperature measurement up to 2100 ± 20 °C in an open glow discharge regime.
  • Quantitatively analyzed the thermal sensitivity coefficient of single-mode fiber (SMF) at 1550 nm to be 10 pm/°C.
  • Demonstrated high accuracy in delay time measurement (minimum 40 fs) and assessed dynamic impacts on optical path length.

Conclusions:

  • OFDR is a viable technique for distributed high-temperature sensing during electric arc discharges.
  • The correlation of Rayleigh spectra provides valuable insights into fiber degradation and mechanical stress.
  • The developed method offers reliable monitoring of thermal profiles and dynamic optical changes in extreme environments.