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 language | English |
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Pages (from-to) | 10138-10143 |
Number of pages | 6 |
Journal | IEEE Sensors Journal |
Volume | 24 |
Issue number | 7 |
DOIs | |
State | Published - 1 Apr 2024 |
Keywords
- Fiber Bragg gratings (FBGs)
- high-temperature sensing
- sapphire fiber
- temperature calibration