光纤
反射计
光时域反射计
分布式声传感
光学
光纤传感器
材料科学
布里渊散射
振动
时域
布里渊区
流离失所(心理学)
声学
单模光纤
领域分析
渐变折射率纤维
物理
计算机科学
软件建设
软件系统
计算机视觉
程序设计语言
心理治疗师
软件
心理学
作者
Damien Maraval,Renaud Gabet,Yves Jaouën,Vincent Lamour
标识
DOI:10.1109/jlt.2016.2614835
摘要
Brillouin distributed optical fiber strain sensors are often limited to static events because of necessary long acquisition time due to the frequency sweep technique. Dynamic distributed strain monitoring is necessary to ensure the integrity of linear structures submitted to fatigue loading or vibrations, such as subsea risers or flowlines, overhead pipelines, long bridges, railways, or high-rise towers. In this paper, a novel dynamic Brillouin optical time domain reflectometer for single ended truly distributed strain measurement based on the slope-assisted method is presented. The optical local oscillator frequency is adjusted to measure Brillouin backscattered power at the maximum slope of the Brillouin gain spectrum along the fiber length. Any strain variation inducing Brillouin frequency shift will be detected by amplitude variation. To demonstrate the performance of our acquisition system, three optical fibers have been implemented along a 10 m steel pipe submitted to vibration. Through this mockup testing, we were able to measure the oscillation damping time and the geometrical displacement of the pipe in real time. A 7.6 Hz acquisition rate was achieved with a strain error of ± 40 μ strain and with a spatial resolution of 1 m. From integration of longitudinal strains, pipe displacement is calculated with an error of ± 12 mm. A performance comparison between frequency sweep and slope assisted method is made with a 2 km fiber sensor.
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