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Fiber distributed Brillouin sensing with optical correlation domain techniques

机译：光纤分布布里渊传感器的光学相关域技术

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摘要

Fiber distributed Brillouin sensing is discussed, focusing mainly on optical correlation domain techniques. By synthesizing a delta-function like optical coherence function between pump and probe lightwave traveling along an optical fiber in opposite directions, which is realized by modulating laser source frequency by an appropriate waveform, stimulated Brillouin scattering can be selectively excited at one specific position along the fiber. The selected position can easily be swept by changing the modulation frequency, so the distributed measurement can be achieved. In the system, Brillouin Optical Correlation Domain Analysis (BOCDA), the position to be measured can be selected randomly along the fiber, which is a special feature of the system. Spatial resolution of 1.6 mm and measurement speed of 1000 samples/s have already been demonstrated. With a similar way, distribution of spontaneous Brillouin scattering can also be measured along the fiber. Spatial resolution of 10 mm and measurement speed of 50 samples/s have already been demonstrated in the system, Brillouin Optical Correlation Domain Reflectometry (BOCDR). Brillouin dynamic grating (BDG), which is acoustic-wave generated refractive-index grating caused in the stimulated Brillouin scattering process, was found to cause a Bragg reflection for the orthogonally polarized lightwave in an polarization maintaining fiber. By measuring both the BDG and the Brillouin scattering, discriminative distributed measurement of strain and temperature has been realized by the BOCDA scheme with a 10 mm spatial resolution.
机译：讨论了分布式光纤布里渊传感，主要集中在光学相关域技术上。通过合成沿泵浦和探测光波沿相反方向传播的泵浦光和探测光之间的三角函数（如光学相干函数）（通过以适当的波形调制激光源频率来实现），可以在沿其特定位置上选择性激发受激布里渊散射。纤维。通过更改调制频率，可以轻松地扫掠所选位置，因此可以实现分布式测量。在该系统中，布里渊光学相关域分析（BOCDA）可以沿着光纤随机选择要测量的位置，这是系统的一项特殊功能。已经证明了1.6毫米的空间分辨率和1000个样本/秒的测量速度。以类似的方式，自发的布里渊散射的分布也可以沿着光纤进行测量。布里渊光学相关域反射仪（BOCDR）系统已经证明了10毫米的空间分辨率和50样本/秒的测量速度。布里渊动态光栅（BDG）是在受激布里渊散射过程中产生的声波产生的折射率光栅，被发现对保偏光纤中的正交偏振光波产生布拉格反射。通过同时测量BDG和布里渊散射，通过BOCDA方案实现了具有10 mm空间分辨率的应变和温度的判别式分布式测量。

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  • 来源
    《Optical fiber technology》 |2013年第6ptab期|700-719|共20页
  • 作者

    Kazuo Hotate;

  • 作者单位

    Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 713-8656, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fiber optics sensors; Distributed sensing; Brillouin scattering;

    机译：光纤传感器;分布式感应;布里渊散射;

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