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Summary

A novel quasi-distributed sensor system uses an active mode locking (AML) laser to measure strain. This system precisely detects segment length variations in sensing fibers with high linearity and spatial resolution.

Keywords:
Fabry–Perot interferometerfiber Bragg gratingsmode-locked lasersquasi-distributed sensor

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Area of Science:

  • Optoelectronics
  • Fiber Optic Sensing
  • Laser Physics

Background:

  • Quasi-distributed sensing offers advantages over point or fully distributed systems.
  • Active mode locking (AML) lasers provide precise frequency control.
  • Fiber optic sensors are crucial for remote and harsh environment monitoring.

Purpose of the Study:

  • To implement and validate a novel quasi-distributed sensor system using an AML laser.
  • To demonstrate the capability of measuring strain-induced segment length variations in sensing fibers.
  • To achieve high linearity and spatial resolution in strain measurements.

Main Methods:

  • Utilizing an active mode locking (AML) laser cavity with multiple partially reflecting segments.
  • Implementing two types of partial reflectors (PRs): fiber Bragg gratings and fiber Fabry-Perot interferometers.
  • Correlating mode locking frequency shifts with changes in segment lengths between PRs upon strain application.

Main Results:

  • Demonstrated a linear relationship between mode locking frequency difference and segment length variation (linearity > 0.99).
  • Achieved spatial position resolution below the meter order.
  • Successfully measured strain-induced displacement by analyzing frequency differences.

Conclusions:

  • The developed AML laser-based quasi-distributed sensor system is effective for precise strain measurement.
  • The system offers high linearity and spatial resolution, making it suitable for various sensing applications.
  • This technology advances fiber optic sensing capabilities for structural health monitoring and other fields.