Long-range vibration sensor based on correlation analysis of optical frequency-domain reflectometry signals
Long-range vibration sensor based on correlation analysis of optical frequency-domain reflectometry signals
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DOI：
10.1364/oe.20.028319
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发表时间：
2012-12-17
期刊：
影响因子：
3.8
通讯作者：
Chen, Hongxin
中科院分区：
文献类型：
--
作者：
Ding, Zhenyang;Yao, X. Steve;Chen, Hongxin
提出了一种基于光频域反射（OFDR）信号相关性分析的空间分辨远程振动检测系统。通过对测试光纤上的振动和非振动状态执行两个单独的测量，振动事件的振动频率和位置可以通过分析空间域中的振动和非振动状态的拍频信号之间的互相关来获得，其中拍频信号由测试光纤和本地光振荡器的本地瑞利后向散射信号之间的干涉生成。使用所提出的技术，我们构建了一个标准的基于单模光纤的振动传感器，可以有一个动态范围为12公里，可测量的振动频率高达2 kHz的空间分辨率为5米。此外，还报告了沿测试光纤沿着不同位置的两个振动事件的初步研究结果。(C)2012美国光学学会
We present a novel method to achieve a space-resolved long-range vibration detection system based on the correlation analysis of the optical frequency-domain reflectometry (OFDR) signals. By performing two separate measurements of the vibrated and non-vibrated states on a test fiber, the vibration frequency and position of a vibration event can be obtained by analyzing the cross-correlation between beat signals of the vibrated and non-vibrated states in a spatial domain, where the beat signals are generated from interferences between local Rayleigh backscattering signals of the test fiber and local light oscillator. Using the proposed technique, we constructed a standard single-mode fiber based vibration sensor that can have a dynamic range of 12 km and a measurable vibration frequency up to 2 kHz with a spatial resolution of 5 m. Moreover, preliminarily investigation results of two vibration events located at different positions along the test fiber are also reported. (C) 2012 Optical Society of America