Parallel demodulation method for EFPI and FBG sensors

Details Parallel demodulation method for EFPI and FBG sensors Parallel demodulation method for EFPI and FBG sensors

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005spie.5633..234z&link_type=abstract

Advanced Materials and Devices for Sensing and Imaging II. Edited by Wang, Anbo; Zhang, Yimo; Ishii, Yukihiro. Proceedings of

Physics

Scientific paper

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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