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Fiber Bragg grating sensing system with wavelength-swept-laser distribution and self-synchronization
Optics Letters
|October 1, 2020
Summary
This study introduces a shared wavelength swept laser (WSL) system for fiber Bragg grating (FBG) sensing, reducing costs. A self-synchronization method enables flexible deployment and accurate temperature sensing.
Area of Science:
- Optoelectronics
- Fiber Optic Sensors
- Signal Processing
Background:
- Fiber Bragg gratings (FBGs) are crucial for fiber sensing, often using wavelength swept lasers (WSLs) for interrogation.
- High accuracy in FBG sensing demands high-performance WSLs, increasing system costs.
Purpose of the Study:
- To develop a cost-effective WSL distribution architecture for multiple sensing processing units (SPUs).
- To enable flexible SPU deployment without clock calibration issues in FBG sensing systems.
Main Methods:
- A novel WSL distribution architecture allowing shared WSL access among multiple SPUs.
- Implementation of a self-synchronization scheme for SPU deployment.
- Experimental validation of the proposed system for temperature sensing.
Main Results:
- Demonstrated temperature estimation errors of ~2.5°C and ~0.5°C for high and small temperature ranges, respectively.
- Achieved sensitivities of 0.13°C/ms and 0.14°C/ms.
- Successful flexible deployment of SPUs without clock calibration.
Conclusions:
- The proposed shared WSL architecture effectively reduces system costs for FBG sensing.
- The self-synchronization scheme ensures accurate and flexible SPU deployment.
- The system demonstrates high performance in temperature sensing applications.
