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Abstract
A performance optimization design for a high-speed fiber Bragg grating (FBG) interrogation system based on a high-speed distributed feedback (DFB) swept laser is proposed. A time-division-multiplexing sensor network with identical weak FBGs is constituted to realize high-capacity sensing. In order to further improve the multiplexing capacity, a waveform repairing algorithm is designed to extend the dynamic demodulation range of FBG sensors. It is based on the fact that the spectrum of an FBG keeps stable over a long period of time. Compared with the pre-collected spectra, the distorted spectra waveform are identified and repaired. Experimental results show that all the identical weak FBGs are distinguished and demodulated at the speed of 100 kHz with a linearity of above 0.99, and the range of dynamic demodulation is extended by 40%.
Highlights
With the practical advantages of small size, light weight, multiplexing capability, and resistance to electromagnetic interference (EMI) [1], fiber Bragg grating (FBG) has received considerable interest in the application of mechanical monitoring [2,3,4]
The sampling point on the X axis are the counts of the time, and it can be intuitively seen that 10 identical weak FBGs are separated in the time domain and red shifted with the increase of temperature
With a focus on the deficiencies of the high-speed demodulation system based on a distributed feedback (DFB) laser, this paper proposes two methods to improve its performance
Summary
With the practical advantages of small size, light weight, multiplexing capability, and resistance to electromagnetic interference (EMI) [1], fiber Bragg grating (FBG) has received considerable interest in the application of mechanical monitoring [2,3,4]. Programmable Gate Array (FPGA) real-time data processing circuit, a demodulation speed of 100 kHz was achieved It is considered as a promising demodulation method in engineering applications for its simple structure, low cost, high reliability, and real-time response. It is considered as a promising demodulation method in engineering applications for its simple structure, low cost, high sensing reliability, system and real-time response. In this paper, we combined the high-speed with identical weaktheFBG array, spectral scanning range of the current modulation is only 1 nm, which seriously restricts its capacity whose wavelength change is typically less than 1 nm. We combinedof thean high-speed sensingreflection system with spectrum identical weak array, whose detected, and hencewavelength broadenschange the dynamic demodulation range the FBG sensors.repair. The experimental setup succeeded in demodulating multiple weak FBG sensors at 100 kHz
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