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25 January 2024 Temperature sensing system based on OFDR demodulation principle for identical weakly reflecting FBGs
Hongming Tian, Huan Liu, Haole Kong, Huafei Mao, Yanqing Qiu, Bangning Mao, Yanlong Meng, Yanghui Li, Juan Kang, Le Wang, Yi Li
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Proceedings Volume 12972, International Academic Conference on Optics and Photonics (IACOP 2023); 1297206 (2024) https://doi.org/10.1117/12.3022421
Event: International Academic Conference on Optics and Photonics (IACOP 2023), 2023, ONLINE, China
Abstract
Fiber grating sensing technology is a widely used fiber optic sensing technology due to its ability to form a distributed sensing system for measuring multiple parameters. The number of multiplexed gratings and spatial resolution are important performance indicators of fiber Bragg grating (FBG) sensing systems. This paper proposes a fast distributed temperature measurement system based on the Optical Frequency Domain Reflectometry (OFDR) principle, using a single-mode fiber engraved with five identical weak gratings spaced 30cm apart with a reflectivity of 1% as the sensing fiber. To minimize the impact of light source nonlinearity on demodulation, we use the SiO2 process Mach-Zehnder interferometer (MZI) module with a refractive index difference of 1.5 as an auxiliary interferometer and employ cubic spline interpolation FFT transformation for signal processing. This approach simplifies the design of the laser drive circuit and achieves a temperature resolution of 0.5°C.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Hongming Tian, Huan Liu, Haole Kong, Huafei Mao, Yanqing Qiu, Bangning Mao, Yanlong Meng, Yanghui Li, Juan Kang, Le Wang, and Yi Li "Temperature sensing system based on OFDR demodulation principle for identical weakly reflecting FBGs", Proc. SPIE 12972, International Academic Conference on Optics and Photonics (IACOP 2023), 1297206 (25 January 2024); https://doi.org/10.1117/12.3022421
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KEYWORDS
Fiber Bragg gratings
Reflection
Demodulation
Sensing systems
Signal processing
Temperature metrology
Bragg wavelengths
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