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Low-Cost Interrogation System for Long-Period Fiber Gratings Applied to Remote Sensing.

P S S Dos Santos1, P A S Jorge2,3, José M M M de Almeida4,5

  • 1INESC TEC-Institute for Systems and Computer Engineering, Technology and Science, 4200-465 Porto, Portugal. paulo.s.santos@inesctec.pt.

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Summary

We developed a low-cost, portable system for interrogating long-period fiber gratings (LPFGs). This affordable setup enables real-time monitoring and data logging for various sensing applications.

Keywords:
corrosion sensinginterrogation systemlong period fiber gratingoptical fiber sensorremote sensing

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Area of Science:

  • Photonics and Optical Sensing
  • Fiber Optic Sensors
  • Instrumentation

Background:

  • Traditional interrogation systems for long-period fiber gratings (LPFGs) are often expensive and complex.
  • There is a need for cost-effective and portable solutions for LPFG sensing applications.

Purpose of the Study:

  • To develop and validate a portable, low-cost system for interrogating LPFGs.
  • To demonstrate the system's capability for real-time monitoring and data logging.
  • To assess the system's performance in measuring temperature and refractive index changes.

Main Methods:

  • Utilized three thermally modulated fiber-coupled laser diodes to sweep wavelengths.
  • Employed a single photodetector to acquire the modulated light signal.
  • Reconstructed the sensor transmission spectrum using curve-fitting algorithms.

Main Results:

  • Achieved dynamic temperature resolution between 3.5 and 1.9 °C (125–325 °C).
  • Obtained maximum wavelength and optical power deviations of 2.75 nm and 2.86 dB for refractive index measurements.
  • Demonstrated application in iron corrosion detection with wavelength peak values within 1.12 nm of the true value.

Conclusions:

  • The developed system offers a significantly lower-cost alternative to traditional LPFG interrogation setups.
  • The portable platform is suitable for real-time monitoring and stand-alone data logging.
  • The system demonstrates reliable performance for temperature, refractive index, and corrosion sensing.