20 January 2005 Parallel demodulation method for EFPI and FBG sensors
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Abstract
EFPI(extrinsic Fabry-Perot interferometer) and FBG(fiber Bragg grating) sensors are two kinds of the most promising sensors for structure health monitoring and can resolve the problem of cross sensitivity of sensing well when they are used simultaneously for strain and temperature measurement. A parallel demodulation method for the two types of sensors is developed for the goal, which based on a set of Michelson interferometer and combined the methods of low coherence interference and Fourier transform spectrum. The signals from EFPI and FBG sensors are obtained at the same time by scanning one arm of Michelson interferometer, and an algorithm model is established to retrieve the information of wavelength of FBG and cavity length of EFPI, which then be used to determine the information of strain and temperature. The experiment shows the demodulation precision of FBG is 14.4 pm and that of EFPI is 0.203μm.
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Yimo Zhang, Yimo Zhang, Junfeng Jiang, Junfeng Jiang, Tiegen Liu, Tiegen Liu, Lina Liu, Lina Liu, Yunxin Wang, Yunxin Wang, Pin Long, Pin Long, } "Parallel demodulation method for EFPI and FBG sensors", Proc. SPIE 5633, Advanced Materials and Devices for Sensing and Imaging II, (20 January 2005); doi: 10.1117/12.570737; https://doi.org/10.1117/12.570737
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