Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Research on Temperature Sensing Characteristics of Fiber Bragg Grating in Wide Temperature Range

  • Naikui Ren (Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology) ;
  • Hongyang Li (Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology) ;
  • Nan Huo (Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology) ;
  • Shanlong Guo (Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology) ;
  • Jinhong Li (Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology)
  • Received : 2023.12.11
  • Accepted : 2024.03.11
  • Published : 2024.04.25
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Abstract

This study investigates the temperature sensitivities of fiber Bragg grating (FBG) across a broad temperature spectrum ranging from -196 ℃ to 900 ℃. We developed the FBG temperature measurement system using a high-temperature tubular furnace and liquid nitrogen to supply consistent high and low temperatures, respectively. Our research showed that the FBG temperature sensitivity changed from 1.55 to 10.61 pm/℃ in the range from -196 ℃ to 25 ℃ when the FBG was packaged with a quartz capillary. In the 25-900 ℃ range, the sensitivity varied from 11.26 to 16.62 pm/℃. Contrary to traditional knowledge, the FBG temperature sensitivity was not constant. This inconsistency primarily stems from the nonlinear shifts in the thermo-optic coefficient and thermal expansion coefficient across this temperature spectrum. The theoretically predicted and experimentally determined temperature sensitivities of FBGs encased in quartz capillary were remarkably consistent. The greatest discrepancy, observed at 25 ℃, was approximately 1.3 pm/℃. Furthermore, it was observed that at 900 ℃, the FBG was rapidly thermally erased, exhibiting variable reflected intensity over time. This study focuses on the advancement of precise temperature measurement techniques in environments that experience wide temperature fluctuations, and has considerable potential application value.

Keywords

Acknowledgement

Fundamental Research Program of Shanxi Province (202303021212221), Shanxi Province Science Foundation for Youths (201901D211301); Taiyuan University of Science and Technology Scientific Research Initial Funding (20222122, 20232036); Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (2022L299, 2022L300).

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