Distributed Sensing Over Meter Lengths Using Twisted Multicore Optical Fiber With Continuous Bragg Gratings
Distributed Sensing Over Meter Lengths Using Twisted Multicore Optical Fiber With Continuous Bragg Gratings
复制标题
使用具有连续布拉格光栅的扭绞多芯光纤在数米长度上进行分布式传感
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
R. Ortiz
中科院分区：
文献类型：
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作者：
P. Westbrook;K. Feder;T. Kremp;W. Ko;H. Wu;E. Monberg;D. Simoff;K. Bradley;R. Ortiz
在本文中，我们回顾了最近的发展，多芯光纤连续光栅适用于各种分布式传感应用，包括形状，温度，应变和声信号。我们描述了一种用于形状感测的集成光纤组件。我们的形状传感器模块由一段长度（> 1米）的扭曲多芯光纤与光纤布拉格光栅沿其长度沿着刻。我们的光纤具有紧凑的200微米涂层直径，每米50圈的扭曲和光栅反射率大于0.001%每厘米的阵列，适用于高效率的散射测量超过许多米的光纤。还演示了使用OFS Fitel拼接器进行多芯光纤拼接。紫外线透明涂层保护光纤在接近原始的机械强度，同时允许在光栅刻写过程中进行卷到卷处理，而不会剥离涂层。然后，我们展示了一个形状重建算法与纤维，以获得各种形状，只使用核心反射光。最后，我们描述了增强型瑞利散射光纤，其在大的光学带宽上具有空间连续的散射，适用于改进的分布式应变、温度和声学传感，其使用传统上使用光纤瑞利后向散射的双折射算法。
In this paper we review recent developments in multicore optical fibers with continuous gratings suitable for various distributed sensing applications including shape, temperature, strain and acoustic signals. We describe an integrated optical fiber assembly for shape sensing. Our shape sensor module consists of a length (>1m) of twisted multicore optical fiber with fiber Bragg gratings inscribed along its length. Our fiber has a compact 200 micron coated diameter, a twist of 50 turns per meter and grating reflectivities greater than 0.001% per cm of array, suitable for high efficiency scatter measurements over many meters of fiber. Multicore fiber splicing with an OFS Fitel splicer is also demonstrated. A UV transparent coating protects the fiber at near pristine mechanical strength, while allowing for reel to reel processing during grating inscription without stripping the coating. We then demonstrate a shape reconstruction algorithm with the fiber to obtain various shapes using only the core reflected light. Finally, we describe enhanced Rayleigh-like scattering fibers with spatially continuous scattering over a large optical bandwidth, suitable for improved distributed strain, temperature and acoustic sensing using interrogator algorithms that traditionally use fiber Rayleigh backscattering.