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24 November 2023 Highly localized fiber Bragg grating for directional vibration sensing at high temperature
Runxiao Chen, Jun He, Xizhen Xu, Ying Wang, Yiping Wang
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Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 129354Z (2023) https://doi.org/10.1117/12.3008146
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China
Abstract
Vibration monitoring is crucial in many fields such as seismic detection, oil and gas exploration and structural health monitoring. Here, we present a novel directional accelerometer using a highly localized fiber Bragg grating (FBG) fabricated by a beam-shaping femtosecond (fs) laser point-by-point (PbP) technology. The FBG was inscribed with asymmetric refractive index modulations (RIMs) in the fiber core of a single-mode fiber (SMF), ensuring directional coupling of cladding mode resonances and thus providing a sensing mechanism for directional vibration response. A reflective accelerometer was achieved by sputtering a nano-gold reflector on the fiber end of the FBG. The acceleration sensitivity and directional dependence of the accelerometer were experimentally investigated, which exhibited an excellent directional vibration response with a maximum acceleration sensitivity of 0.113 V/g at high temperature of 450 ℃. Notably, the core mode resonance of the FBG can be used to calibrate the power fluctuations and cancel out the temperature crosstalk. The proposed directional accelerometer is compact, flexible, and high-temperature-resistant, which exhibits promising potential for structures vibration monitoring in harsh environments.
(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Runxiao Chen, Jun He, Xizhen Xu, Ying Wang, and Yiping Wang "Highly localized fiber Bragg grating for directional vibration sensing at high temperature", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 129354Z (24 November 2023); https://doi.org/10.1117/12.3008146
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KEYWORDS
Vibration
Fiber Bragg gratings
Sensors
Accelerometers
Cladding
Femtosecond phenomena
Sensing systems
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