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Sensors 2018, 18(1), 210; https://doi.org/10.3390/s18010210

Multiple-Octave-Spanning Vibration Sensing Based on Simultaneous Vector Demodulation of 499 Fizeau Interference Signals from Identical Ultra-Weak Fiber Bragg Gratings Over 2.5 km

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National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China
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School of Science, Wuhan University of Technology, Wuhan 430070, China
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Department of Electrical and Computer Engineering, University of Toronto, Toronto, ON M5S 1A1, Canada
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Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education, Wuhan University of Technology, Wuhan 430070, China
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Author to whom correspondence should be addressed.
Received: 1 December 2017 / Revised: 2 January 2018 / Accepted: 9 January 2018 / Published: 12 January 2018
(This article belongs to the Special Issue Fiber Bragg Grating Based Sensors)
View Full-Text   |   Download PDF [4574 KB, uploaded 12 January 2018]   |  

Abstract

Multi-point vibration sensing at the low frequency range of 0.5–100 Hz is of vital importance for applications such as seismic monitoring and underwater acoustic imaging. Location-resolved multi-point sensing using a single fiber and a single demodulation system can greatly reduce system deployment and maintenance costs. We propose and demonstrate the demodulation of a fiber-optic system consisting of 500 identical ultra-weak Fiber Bragg gratings (uwFBGs), capable of measuring the amplitude, frequency and phase of acoustic signals from 499 sensing fibers covering a total range of 2.5 km. For demonstration purposes, we arbitrarily chose six consecutive sensors and studied their performance in detail. Using a passive demodulation method, we interrogated the six sensors simultaneously, and achieved a high signal-to-noise ratio of 22.1 dB, excellent linearity, phase sensitivity of around 0.024 rad/Pa, and a dynamic range of about 38 dB. We demonstrated a frequency response flatness of <1.2 dB in the range of 0.5–100 Hz. Compared to the prior state-of-the-art demonstration using a similar method, we have increased the sensing range from 1 km to 2.5 km, and increased the frequency range from 0.4 octaves to 7.6 octaves, in addition to achieving sensing in the very challenging low-frequency range of 0.5–100 Hz. View Full-Text
Keywords: fiber-optic sensors; fiber Bragg gratings; vibration sensing; low-frequency range fiber-optic sensors; fiber Bragg gratings; vibration sensing; low-frequency range
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, Y.; Qian, L.; Zhou, C.; Fan, D.; Xu, Q.; Pang, Y.; Chen, X.; Tang, J. Multiple-Octave-Spanning Vibration Sensing Based on Simultaneous Vector Demodulation of 499 Fizeau Interference Signals from Identical Ultra-Weak Fiber Bragg Gratings Over 2.5 km. Sensors 2018, 18, 210.

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