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Low-Cost Interrogation Technique for Dynamic Measurements with FBG-Based Devices.

Camilo A R Díaz1, Cátia Leitão2,3, Carlos A Marques4,5

  • 1Telecommunications Laboratory LABTEL, Electrical Engineering Department, Federal University of Espírito Santo, 29075-910 Espírito Santo, Brazil. c.rodriguez.2016@ieee.org.

Sensors (Basel, Switzerland)
|October 26, 2017
PubMed
Summary

This study introduces a cost-effective edge filter for interrogating fiber Bragg gratings (FBGs) in dynamic measurements. The developed system accurately measures signals up to 5 kHz, offering a viable alternative to expensive commercial monitors.

Keywords:
arterial central pulse waveformcardiovascular monitoringfiber Bragg grating (FBG)in-line Fabry–Perot interferometer (FPI)interrogation techniqueoptical accelerometer

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Area of Science:

  • Optical sensing technologies
  • Fiber optic sensor interrogation
  • Interferometry

Background:

  • Fiber Bragg gratings (FBGs) are essential optical fiber sensors for temperature and strain measurement.
  • High costs of interrogation systems limit widespread commercial adoption of FBG sensors.
  • Dynamic measurements require high-speed and accurate signal processing.

Purpose of the Study:

  • To develop and validate a low-cost interrogation system for dynamic fiber Bragg grating (FBG) measurements.
  • To explore the use of an in-line Fabry-Perot interferometer (FPI) based edge filter for FBG interrogation.
  • To assess the performance of the developed system for measurements up to 5 kHz.

Main Methods:

  • An in-line Fabry-Perot interferometer (FPI) edge filter was designed and implemented.
  • The FPI edge filter was used to interrogate FBGs for dynamic measurements.
  • Two devices, an accelerometer and an arterial pulse wave probe, were tested.
  • Results were compared against a commercial interrogation monitor.

Main Results:

  • The developed FPI edge filter system achieved agreement with a commercial interrogation monitor.
  • A maximum Root Mean Square Error (RMSE) of 0.05 was recorded, meeting measurement requirements.
  • High resolutions of 3.6 pm (accelerometer) and 2.4 pm (pulse wave probe) were achieved.

Conclusions:

  • The FPI-based edge filter provides a cost-effective solution for interrogating FBGs in dynamic applications.
  • The system demonstrates capability for high-frequency measurements (up to 5 kHz) with high accuracy.
  • This approach offers a promising alternative for commercial applications of FBG sensing.