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Ultra-Long-Distance Hybrid BOTDA/Ф-OTDR.
Yun Fu1, Zinan Wang2,3, Richeng Zhu4
1Key Laboratory of Optical Fiber Sensing and Communications (Ministry of Education), University of Electronic Science and Technology of China (UESTC), Chengdu 611731, China. y_fu_uestc@163.com.
Sensors (Basel, Switzerland)
|March 29, 2018
Summary
This study presents a hybrid distributed optical fiber sensing system for simultaneous vibration and temperature/strain measurement over 150 km. It integrates Brillouin optical time-domain analysis (BOTDA) and phase-sensitive optical time-domain reflectometry (Ф-OTDR) for ultra-long-range sensing applications.
Area of Science:
- Fiber Optic Sensing
- Photonics
- Signal Processing
Background:
- Simultaneous vibration and temperature/strain measurement using distributed optical fiber sensing (DOFS) is crucial for various applications.
- Ultra-long sensing ranges present challenges due to scattering mechanism interplay and signal interactions.
Purpose of the Study:
- To design and demonstrate a hybrid DOFS system capable of simultaneous temperature/strain and vibration measurement over an extended range.
- To overcome limitations of existing DOFS systems for ultra-long-distance applications.
Main Methods:
- Integration of Brillouin optical time-domain analyzer (BOTDA) and phase-sensitive optical time-domain reflectometry (Ф-OTDR).
- Utilized distributed Raman and Brillouin amplifications, alongside frequency, wavelength, and time division multiplexing (FDM, WDM, TDM).
Main Results:
- Achieved a simultaneous sensing range of 150.62 km.
- Obtained spatial resolutions of 9 m for BOTDA and 30 m for Ф-OTDR.
- Reported a BOTDA measurement uncertainty of ± 0.82 MHz.
Conclusions:
- Successfully demonstrated the first hybrid DOFS system with a hundred-kilometer sensing scale for simultaneous measurements.
- The proposed system effectively integrates multiple techniques to achieve ultra-long-range sensing capabilities.
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