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An Optimized Self-Compensated Solution for Temperature and Strain Cross-Sensitivity in FBG Interrogators Based on

Mariana L Silveira1, Helder R O Rocha1, Paulo F C Antunes2,3

  • 1Telecommunications Laboratory LABTEL, Electrical Engineering Department, Federal University of Espírito Santo, Vitória 29075-910, Brazil.

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Summary

This study presents a novel self-compensated optical fiber sensor technique to eliminate temperature influences on strain measurements. The method uses a grey wolf optimizer (GWO) algorithm for optimal fiber Bragg grating (FBG) tuning, improving accuracy.

Keywords:
edge filterfiber Bragg gratingsfiber optical sensorsgrey wolf optimization algorithmtemperature cross-sensitivity

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Area of Science:

  • Optical Engineering
  • Sensor Technology
  • Metrology

Background:

  • Fiber Bragg gratings (FBGs) are susceptible to temperature-induced errors in strain measurements due to cross-sensitivity.
  • Accurate strain monitoring requires effective compensation for environmental temperature fluctuations.

Purpose of the Study:

  • To develop and validate a self-compensated technique for canceling temperature's influence on FBG-based strain measurements.
  • To investigate the use of a grey wolf optimizer (GWO) algorithm for optimizing FBG spectral characteristics.

Main Methods:

  • Proposed an edge-filter-based interrogator utilizing a Fabry-Perot interferometer as an optical filter.
  • Employed two FBGs (sensor and reference) whose central peaks align with the filter's slopes.
  • Utilized the GWO algorithm for tuning the spectral properties of the FBGs to achieve optimal compensation.

Main Results:

  • Simulations demonstrated an average relative error of 3.4% for strain measurements up to 700μϵ with optimal FBG characteristics under 30°C variations.
  • Experimental tests under non-ideal conditions showed a 50.8% reduction in temperature sensitivity compared to uncompensated systems.
  • Maximum theoretical and experimental data discrepancy was 5.79%, confirming result compatibility.

Conclusions:

  • The proposed self-compensated FBG sensor technique effectively mitigates temperature cross-sensitivity in strain measurements.
  • The GWO algorithm is a viable tool for optimizing FBG spectral characteristics for enhanced sensor performance.
  • The method maintains the interrogation range while significantly improving measurement accuracy and reliability.