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Updated: Jan 17, 2026
08:23
A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
Published on: September 30, 2019
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High-precision distributed magnetic field sensing using polarization-sensitive TGD-OFDR based on quaternion analysis
Optics Letters
|September 16, 2025
Summary
We developed a new fiber-based magnetic field sensor using polarization-sensitive time-gated digital optical frequency-domain reflectometry (TGD-OFDR). This novel approach achieves 10 km sensing distance and 1.75 mT precision for high-intensity magnetic field measurements.
Area of Science:
- Optics and Photonics
- Sensor Technology
- Electromagnetism
Background:
- Fiber-based distributed magnetic field sensing is crucial for high-intensity fields like nuclear monitoring.
- Existing polarization-sensitive reflectometry methods are limited by distance and sensitivity.
Purpose of the Study:
- To introduce a novel fiber-based sensing approach for enhanced magnetic field measurement.
- To overcome the limitations of current reflectometry techniques in distance and sensitivity.
Main Methods:
- Developed a polarization-sensitive time-gated digital optical frequency-domain reflectometry (TGD-OFDR) system.
- Utilized quaternion analysis to quantify magnetic field intensity via polarization state changes.
Main Results:
- Achieved a record sensing distance of 10 kilometers.
- Demonstrated a magnetic field measurement precision of 1.75 millitesla (mT).
Conclusions:
- The proposed TGD-OFDR method significantly advances fiber-based magnetic field sensing capabilities.
- This technology offers a promising solution for remote, high-precision magnetic field monitoring in demanding environments.
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