Characterization of High-Temperature Performance of a Sapphire Fiber Bragg Grating with a Single-Mode Demodulation System

Qiang Bian, Hongtian Zhu, Peiguang Yan, Yang Yu, Fabian Buchfellner, Andrea Stadler, Alexander Roehrl, Alexander W. Koch, Johannes Roths

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The high-temperature performance of a sapphire fiber Bragg grating (FBG) has been characterized by a commercial single-mode interrogator. By using the mode field matching fusion splicing method, we proposed before, high-order modes in the reflection spectrum of the sapphire FBG could be suppressed and a quasi-single-mode reflection spectrum could be obtained from a single-mode fiber-based demodulation system. A 48-h isothermal annealing at 900 °C and two temperature calibration processes, one up to 800 °C and another up to 1200 °C, were carried out successively. There was no obvious reflectivity decay or wavelength drift during the 900 °C annealing process, and no hysteresis during the two temperature calibration processes. The precisions of the sapphire FBG were ±0.25 °C in the 800 °C calibration process, while increased to ±5 °C in the 1200 °C calibration process.

Original languageEnglish
Pages (from-to)10138-10143
Number of pages6
JournalIEEE Sensors Journal
Volume24
Issue number7
DOIs
StatePublished - 1 Apr 2024

Keywords

  • Fiber Bragg gratings (FBGs)
  • high-temperature sensing
  • sapphire fiber
  • temperature calibration

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