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Sensors 2018, 18(2), 665;

High-Speed Interrogation for Large-Scale Fiber Bragg Grating Sensing

MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
School of Information Engineering, Hubei University of Chinese Medicine, Wuhan 430065, China
Author to whom correspondence should be addressed.
Received: 21 January 2018 / Revised: 8 February 2018 / Accepted: 11 February 2018 / Published: 24 February 2018
(This article belongs to the Section Physical Sensors)
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A high-speed interrogation scheme for large-scale fiber Bragg grating (FBG) sensing arrays is presented. This technique employs parallel computing and pipeline control to modulate incident light and demodulate the reflected sensing signal. One Electro-optic modulator (EOM) and one semiconductor optical amplifier (SOA) were used to generate a phase delay to filter reflected spectrum form multiple candidate FBGs with the same optical path difference (OPD). Experimental results showed that the fastest interrogation delay time for the proposed method was only about 27.2 us for a single FBG interrogation, and the system scanning period was only limited by the optical transmission delay in the sensing fiber owing to the multiple simultaneous central wavelength calculations. Furthermore, the proposed FPGA-based technique had a verified FBG wavelength demodulation stability of ±1 pm without average processing. View Full-Text
Keywords: fiber Bragg gratings; fiber optics sensors; modulation; multiplexing fiber Bragg gratings; fiber optics sensors; modulation; multiplexing

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Hu, C.; Bai, W. High-Speed Interrogation for Large-Scale Fiber Bragg Grating Sensing. Sensors 2018, 18, 665.

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