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Ring core few-mode fiber sensor for curvature measurement
Applied Optics
|April 26, 2022
Summary
This study introduces a novel fiber optic sensor for precise curvature measurement. The ring core few-mode fiber Mach-Zehnder interferometer demonstrates high sensitivity for structural health monitoring applications.
Area of Science:
- Fiber optics
- Optical sensing
- Interferometry
Background:
- Fiber optic sensors are crucial for remote and real-time monitoring.
- Existing sensors face limitations in sensitivity and specificity for certain applications.
Purpose of the Study:
- To propose and demonstrate an all-fiber Mach-Zehnder interferometer (MZI) for enhanced curvature sensing.
- To investigate the sensor's performance and potential applications in structural health monitoring.
Main Methods:
- Fabrication of an MZI by splicing a ring core few-mode fiber (RC-FMF) between two single-mode fibers (SMF).
- Utilizing the unique properties of RC-FMF for improved curvature sensitivity.
- Monitoring wavelength shifts of interference dips for curvature measurement.
Main Results:
- The sensor achieved a high curvature sensitivity of -4.370 nm/m⁻¹ within the range of 1.199-1.549 m⁻¹.
- The sensor also exhibited temperature sensing capabilities with a maximum sensitivity of 57.6 pm/°C (25°C–45°C).
Conclusions:
- The proposed RC-FMF based MZI sensor offers superior sensitivity for curvature detection.
- This technology holds significant potential for applications in building structural health monitoring and bridge engineering.
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