Dynamic Measurements of 1000 Microstrains Using Chirped-Pulse Phase-Sensitive Optical Time-Domain Reflectometry
Dynamic Measurements of 1000 Microstrains Using Chirped-Pulse Phase-Sensitive Optical Time-Domain Reflectometry
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DOI：
10.1109/jlt.2019.2928621
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发表时间：
2019-09-15
影响因子：
4.7
通讯作者：
Gonzalez-Herraez, Miguel
中科院分区：
文献类型：
--
作者：
Bhatta, Hari Datta;Costa, Luis;Gonzalez-Herraez, Miguel
本文将啁啾脉冲相敏光时域反射计的测量能力扩展到数百米标准单模光纤的大动态应变测量。得益于单次应变测量，这种技术已经证明了动态应变的顺序，亚微应变的灵敏度picostrainsper-root-Hertz。然而，对于大的动态应变，它依赖于增量测量的积累，其中每个迹线与其前一个迹线交叉相关以确定应变的相对变化。然而，实际的时间记录测量的高转换速率施加的扰动包含令人不安的离群值。然后，我们详细介绍和分析后处理策略，以减轻这种限制。通过这种策略，我们能够实现第一次（据我们所知）高信号噪声瑞利背散射为基础的分布式测量的大型和快速的动态应变的纵向振动的4米部分在210米的单模光纤的结束：从峰值到峰值150-1190亩，分别在400 Hz和50 Hz的振动频率。
This paper extends the capabilities of chirped-pulse phase-sensitive optical time-domain reflectometry to the measurement of large dynamic strains over hundreds of meters of standard single-mode fiber. Benefitting from single-shot strain measurements, this technique has already demonstrated dynamic strains of the order of submicrostrains with a sensitivity of picostrainsper-root-Hertz. Yet, for large dynamic strains, it relies on the accumulation of incremental measurements, where each trace is cross correlated with its predecessor to determine the relative change of strain. However, practical time records of measured high slew-rate applied perturbations contain disturbing outliers. We then detail and analyze a post-processing strategy to mitigate this limitation. Through this strategy, we are able to achieve for the first time (to our knowledge) high signal-to-noise Rayleigh-backscattering-based distributed measurements of large and fast dynamic strains of a longitudinally vibrating 4 m section at the end of 210 m of a single-mode fiber: from peak to peak 150-1190 mu epsilon at vibration frequency of 400 Hz and 50 Hz, respectively.