Abstract
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.
Highlights
Large-scale fiber Bragg grating (FBG) sensing arrays have attracted considerable interest because of their electromagnetic immunity, low crosstalk and strong multiplexing capacity [1,2,3].The phase-mask online writing technique used to write weak FBGs from the draw tower eliminates large losses, low mechanical strength, etc. in the process of large-scale FBG networking
Cui et al calculated the phase in a field-programmable gate array (FPGA) in real time for a time division multiplexing sensor array [10]
We presented in this paper a novel technique for eliminating the FBG interrogation
Summary
Large-scale fiber Bragg grating (FBG) sensing arrays have attracted considerable interest because of their electromagnetic immunity, low crosstalk and strong multiplexing capacity [1,2,3]. Dai et al theoretically implemented a wavelength and time division multiplexing array with over 1000 sensors on one single fiber [9]. K. Cui et al calculated the phase in a field-programmable gate array (FPGA) in real time for a time division multiplexing sensor array [10]. Cui et al calculated the phase in a field-programmable gate array (FPGA) in real time for a time division multiplexing sensor array [10] Both light source and sensor signal demodulation were present at the both ends of the sensing system. FBGs, andimplement can intrinsically the feature of a central weak FBG spectrum, this technique simultaneously centralsuppress wavelength accumulative noise greatly.FBGs, and can intrinsically suppress the accumulative noise greatly
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
