Laser & Optoelectronics Progress, Vol. 57, Issue 21, 210002 (2020)
Distributed Fiber Sensor Based on Brillouin Optical Time Domain Reflection Technique
Yuben Bao, Junqiang Sun*, and Qiang Huang
- 华中科技大学武汉光电国家研究中心, 湖北 武汉 430074
Brillouin optical time domain reflection (BOTDR) technique is a kind of simultaneous sensing technology for temperature and strain that has numerous applications and huge potentials. Compared with other sensing technologies, BOTDR has the following advantages: high accuracy, convenient layout, large dynamic range, and long measurement distance. This study introduces the principle of BOTDR and illustrates its main performance indexes. Additionally, new developments and key advances in BOTDR sensing for decades are reviewed, including improvement of spatial resolution, expansion of measurement distance, improvement of measurement accuracy, reduction of measurement time, as well as the solution of temperature and strain cross-sensitivity. Moreover, the examples of BOTDR application are introduced from the structural health monitoring of infrastructure and the pre-warning of geological disaster, and their characteristics are discussed. A typical BOTDR is advanced, and the developing trend in future will be characterized by the improvement of software, field-engineering application, and combination of multiple platforms.
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