反射计
瑞利散射
光学
频域
光时域反射计
分布式声传感
时域
互相关
物理
相(物质)
光纤传感器
光纤
保偏光纤
数学
计算机科学
统计
数学分析
量子力学
计算机视觉
作者
Felipe Muñoz,Loreto Romero,Marcelo A. Soto
出处
期刊:Optics Letters
[The Optical Society]
日期:2022-10-19
卷期号:47 (21): 5521-5521
被引量:2
摘要
The use of phase cross correlation is proposed to estimate the frequency shift of the Rayleigh intensity spectral response in frequency-scanned phase-sensitive optical time-domain reflectometry (φ-OTDR). Compared with the standard cross correlation, the proposed approach is an amplitude-unbiased technique that evenly weights all spectral samples in the cross correlation, making the frequency-shift estimation less sensitive to high-intensity Rayleigh spectral samples and reducing large estimation errors. Using a 5.63-km sensing fiber with 1-m spatial resolution, experimental results demonstrate that the proposed method highly reduces the presence of large errors in the frequency shift estimation, increasing the reliability of the distributed measurements while keeping the frequency uncertainty as low as approximately 1.0 MHz. The technique can be also used to reduce large errors in any distributed Rayleigh sensor that evaluates spectral shifts, such as polarization-resolved φ-OTDR sensors and optical frequency-domain reflectometers.
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