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Distributed fiber-optic sensor for location based on polarization-stabilized dual-Mach-Zehnder interferometer
Optics Express
|September 10, 2020
Summary
A new dual Mach-Zehnder interferometer (DMZI) fiber-optic sensor accurately detects vibrations over 100 km. This distributed sensor system achieves precise vibration location with minimal error, advancing sensing technology.
Area of Science:
- Photonics and Optical Sensing
- Distributed Sensing Systems
- Vibration Analysis
Background:
- Traditional fiber-optic sensors face limitations in long-distance sensing and precise localization.
- Accurate detection of time-varying phase changes is crucial for vibration analysis.
Purpose of the Study:
- To propose and demonstrate a novel distributed fiber-optic sensor for long-range vibration detection and localization.
- To develop a dual Mach-Zehnder interferometer (DMZI) system for enhanced sensing capabilities.
Main Methods:
- Utilizing two Mach-Zehnder interferometers with different wavelengths to detect interference signals.
- Employing a 3x3 coupler for demodulating time-varying phase changes caused by vibrations.
- Implementing a time delay estimation algorithm and cross-correlation for vibration position determination.
Main Results:
- The developed dual Mach-Zehnder interferometer (DMZI) sensor achieved a sensing distance of up to 100 km.
- The system demonstrated a high location accuracy for vibrations, with an error within ±25 meters.
Conclusions:
- The novel DMZI fiber-optic sensor offers a robust solution for long-distance, high-accuracy vibration monitoring.
- This technology has significant potential for applications requiring precise remote sensing.
