Model-based position and reflectivity estimation of fiber bragg grating sensor arrays

Stefan Werzinger*, Darko Zibar, Max Köppel, Bernhard Schmauss

*Corresponding author for this work

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Abstract

We propose an efficient model-based signal processing approach for optical fiber sensing with fiber Bragg grating (FBG) arrays. A position estimation based on an estimation of distribution algorithm (EDA) and a reflectivity estimation method using a parametric transfer matrix model (TMM) are outlined in detail. The estimation algorithms are evaluated with Monte Carlo simulations and measurement data from an incoherent optical frequency domain reflectometer (iOFDR). The model-based approach outperforms conventional Fourier transform processing, especially near the spatial resolution limit, saving electrical bandwidth and measurement time. The models provide great flexibility and can be easily expanded in complexity to meet different topologies and to include prior knowledge of the sensors. Systematic errors due to crosstalk between gratings caused by multiple reflections and spectral shadowing could be further considered with the TMM to improve the performance of large-scale FBG array sensor systems.
Original languageEnglish
JournalSensors
Volume18
Issue number7
Number of pages22
ISSN1424-8220
DOIs
Publication statusPublished - 2018

Keywords

  • Optical fiber sensing
  • Fiber Bragg gratings
  • Signal processing
  • Modeling
  • Estimation of distribution algorithm
  • Optical frequency domain reflectometry
  • Temperature sensing

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