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Analysis of the reflective-matched fiber Bragg grating sensing interrogation scheme
A B Lobo Ribeiro1, L A Ferreira, J L Santos
1Grupo de Optoelectrónica, Instituto de Engenharia de Séstemas e Computadores, Rua José Falcāo 110, 4000 Porto, Portugal.
Abstract:
A technique for the demodulation of fiber Bragg grating (FBG) sensors based on the use of a second wavelength-matched FBG receiver to track wavelength shifts from the FBG sensor is analyzed, particularly regarding its sensitivity as determined by primary noise sources. Numerical and experimental results show that there is an optimum Bragg wavelength difference between the two FBG's that maximizes the sensitivity for this demodulation technique.
