Distributed sensing technology of high-spatial resolution based on dense ultra-short FBG array with large multiplexing capacity

作者：Gui Xin, Li Zhengying, Wang Fan, Yiming Wang, Changjia Wang, Siyue Zeng, Haihu Yu · 发表于：Optics Express · 年份：2017 · DOI：10.1364/oe.25.028112 · 被引用次数：97 · 研究领域：Advanced Fiber Optic Sensors、Photonic Crystal and Fiber Optics、Advanced Fiber Laser Technologies

We developed a large multiplexing capacity dense ultra-short (DUS)-FBG array for high spatial resolution distributed sensing applications. With identical central wavelength and low peak reflectivity (−40 dB), all the ultra-short FBGs share the short length (1 mm) and extremely small spacing (500 μm). The large multiplexing capacity and lower crosstalk of the DUS-FBG is investigated through both simulation and experiment. Use of DUS-FBG array interrogated by optical frequency domain reflectometry (OFDR) for distributed temperature and non-uniform strain sensing was conducted. We demonstrated high spatial resolution over 6680 FBGs along a 10 m-long fiber, and temperature and strain precision of 1.00 °Cand 20.02 μe. Distributed temperature and non-uniform strain sensing experiment results are consistent with the theoretical analysis, and verify the high spatial resolution and large multiplexing capacity.