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23 May 2023 Measurement of polarization fading sensitivity in FBGs-assisted Phase-OTDR
Beni Fourier Sandah, Michel Dossou, Marc Wuilpart
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Proceedings Volume 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023); 126432G (2023) https://doi.org/10.1117/12.2677355
Event: European Workshop on Optical Fibre Sensors (EWOFS 2023), 2023, Mons, Belgium
Abstract
Distributed optical fiber vibration sensors (DOFSs) such as those based on phase-sensitive optical time-domain reflectometry (φ-OTDR) have contributed to improve structural health monitoring (SHM). φ-OTDR allows distributed vibration sensing by analysing the interference properties of the backscattered/reflected signal when an optical pulse is launched into the sensing fiber. As the Rayleigh backscattered light is relatively weak, fiber Bragg grating (FBG) arrays can be inscribed in the sensing fiber to increase the signal-to-noise ratio. However, the interference of the signals reflected by two consecutive FBGs (containing information about the locally applied vibration) is subject to a polarization fading effect as the sensing fiber presents some birefringence. Therefore the states of polarization (SOP) of the interfering reflected signals are no longer fully aligned. The present work proposes a measurement setup to quantify the polarization effects in a direct detection phase-OTDR scheme through the polarization fading sensitivity (PFS) parameter.
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Beni Fourier Sandah, Michel Dossou, and Marc Wuilpart "Measurement of polarization fading sensitivity in FBGs-assisted Phase-OTDR", Proc. SPIE 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023), 126432G (23 May 2023); https://doi.org/10.1117/12.2677355
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KEYWORDS
Polarization
Fiber Bragg gratings
Vibration
Structural health monitoring
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