Abstract
A miniaturized, low-cost, 4-channel fiber Bragg grating (FBG) interrogation system for real-time remote monitoring is presented in this paper. A superluminescent light emitting diode (SLED) as the broadband light source combined with an interrogation module and an optical switch is applied in the system. The moving average method is employed to remove noise effects, and then Gaussian fitting method is used to realize the interrogation of FBG central wavelength with high precision. On software design, the WebSocket network protocol is introduced to establish communication between data processing core and webpages to achieve cross-platform remote access through the browser without user’s software installation. The proposed interrogation system not only displays the reflected spectrum and demodulated central wavelength in real time on the webpage, but also realizes the data storage and channel switch remotely. The interrogator for remote monitoring of FBG sensors proposed in this paper has been proved experimentally with the interrogation resolution 0.1 pm, the precision of 5 pm for the FBG central wavelength, interrogation stability up to ± 1.1 pm, and interrogation frequency of 4 kHz.
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