Abstract
A novel fiber Bragg grating (FBG) sensing multiplexing system based
on the combination of InGaAs spectrometer and Fabry–Perot (F-P) filter
(InGaAs/F-P) is proposed. The multiplexing system only demodulates FBG sensors
whose peak wavelengths are shifting. The demodulation can be sequenced according
to each sensor's priority, latency time and wavelength shifting. What is more,
the monitor section of that system is not influenced by environmental temperature
and source intensity fluctuations. At the average signal repeat rate of 6Hz,
the average delay time of the conventional wavelength- and spatial-division
combined system, the long period grating (LPG) combined system and the InGaAs/F-P
system are 303, 97, and 6 ms, respectively. Simulation analysis and experiment
work demonstrated that the InGaAs/F-P system is more rational and smart than
other counterparts.
© 2008 IEEE
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