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Slope-assisted BOTDA based on vector SBS and frequency-agile technique for wide-strain-range dynamic measurements
Optics Express
|March 10, 2018
Summary
This study introduces a novel slope-assisted Brillouin Optical Time Domain Analysis (BOTDA) system for wide-range dynamic strain measurement. The system utilizes vector stimulated Brillouin scattering (SBS) and a frequency-agile technique (FAT) to achieve enhanced strain detection capabilities.
Area of Science:
- Fiber Optic Sensing
- Optical Metrology
- Materials Science
Background:
- Distributed fiber optic sensing is crucial for structural health monitoring.
- Traditional Brillouin Optical Time Domain Analysis (BOTDA) systems face limitations in dynamic strain range and accuracy.
- Existing methods struggle with power fluctuations and limited frequency spans.
Purpose of the Study:
- To develop a slope-assisted BOTDA system for wide-strain-range dynamic measurement.
- To improve strain demodulation accuracy and immunity to pump pulse power fluctuations.
- To extend the dynamic strain measurement range beyond conventional limits.
Main Methods:
- Implementation of a vector stimulated Brillouin scattering (SBS) technique.
- Utilization of a frequency-agile technique (FAT) for extended strain range.
- Employment of a dimensionless coefficient K (Brillouin phase-shift to gain ratio) for strain demodulation.
- Development of single-slope and multi-slope assisted BOTDA configurations.
Main Results:
- The dimensionless coefficient K demonstrates immunity to pump pulse power fluctuations.
- A frequency span of 200MHz was achieved, exceeding fourfold the Brillouin gain spectrum linewidth.
- Single-slope BOTDA achieved dynamic strain measurement up to 2467.4με.
- Multi-slope BOTDA with FAT extended the dynamic strain range to 5372.9με.
Conclusions:
- The proposed slope-assisted BOTDA system effectively enables wide-range dynamic strain measurement.
- The K coefficient provides a robust method for strain demodulation, unaffected by power variations.
- The combination of slope assistance and FAT significantly enhances the system's strain measurement capabilities.
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