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Published on: January 30, 2020
Multilongitudinal mode fiber laser for strain measurement
Shengchun Liu1, Zuowei Yin, Liang Zhang
1Nanjing National Lab of Microstructures, Nanjing University, Nanjing 210093, China.
Optics Letters
|March 19, 2010
Summary
A novel fiber laser sensor using fiber Bragg gratings and erbium-doped fiber measures strain by detecting frequency changes. This simple, stable, and low-cost sensor offers high resolution for strain monitoring applications.
Area of Science:
- Photonics and Optical Sensing
- Fiber Optic Sensors
- Strain Measurement Technologies
Background:
- Fiber Bragg gratings (FBGs) are widely used in sensing.
- Erbium-doped fiber (EDF) lasers offer unique spectral properties.
- Accurate and stable strain monitoring is crucial in various engineering fields.
Purpose of the Study:
- To propose and experimentally validate a novel multilongitudinal mode fiber laser sensor for strain measurement.
- To demonstrate the sensor's performance characteristics, including sensitivity and stability.
- To highlight the sensor's advantages such as simplicity and low-cost demodulation.
Main Methods:
- Fabrication of a fiber laser sensor comprising two FBGs and an EDF.
- Experimental setup for applying strain and measuring the beat frequency of the resonant cavity.
- Analysis of the relationship between applied strain and the change in round-trip frequency.
Main Results:
- The proposed fiber laser sensor successfully measured applied strain.
- A sensitivity of -1.1 KHz/microepsilon was achieved.
- The root-mean-square deviation was measured to be 3.6 microepsilon, indicating high resolution and stability.
Conclusions:
- The developed multilongitudinal mode fiber laser sensor is a simple, stable, and cost-effective solution for strain monitoring.
- The sensor's high resolution and sensitivity make it suitable for precise strain detection.
- Experimental validation confirms the feasibility and effectiveness of the proposed fiber optic sensing approach.
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