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Demonstration of a Filterless, Multi-Point, and Temperature-Independent Fiber Bragg Grating Dynamical Demodulator

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  • 1CPQD Research and Development Center in Telecommunications, Campinas, SP 13086-902, Brazil.

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Summary

This study introduces a filterless fiber Bragg grating demodulator using pulse-width modulation (PWM). This technology enables reliable FBG sensor readings in harsh, high-pressure, and high-temperature environments.

Keywords:
ECUFBGFBG demodulatorPWMenginehigh temperature

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Area of Science:

  • Photonics and Optical Sensing
  • Instrumentation and Measurement
  • Signal Processing

Background:

  • Traditional fiber Bragg grating (FBG) interrogation systems often rely on optical filters, limiting their use in demanding conditions.
  • Developing robust and filterless demodulation techniques is crucial for real-time monitoring in harsh industrial environments.
  • Pulse-width modulation (PWM) offers a potential avenue for simplified and cost-effective FBG sensing.

Discussion:

  • The proposed filterless FBG demodulator utilizes PWM to detect wavelength shifts without optical filters.
  • This approach enhances system resilience, making it suitable for high-pressure and high-temperature applications.
  • The system's performance was validated using an FBG sensor under controlled laboratory conditions and in a field test.

Key Insights:

  • A novel, filterless, and temperature-independent FBG dynamical demodulator based on PWM has been successfully demonstrated.
  • The PWM-based demodulator effectively interrogates FBG sensors in harsh environments, including a thermoelectric power plant engine.
  • The system exhibits robustness and suitability for multi-point sensing applications requiring high reliability.

Outlook:

  • Further optimization of the PWM demodulator for increased demodulation speed and accuracy.
  • Exploration of integration with other sensing modalities for comprehensive environmental monitoring.
  • Potential for widespread adoption in industries such as aerospace, energy, and civil engineering.