Design of vibration-insensitive Sagnac fiber-optic current sensors using spun high-birefringence fibers
Design of vibration-insensitive Sagnac fiber-optic current sensors using spun high-birefringence fibers
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DOI：
10.1080/09500340.2014.922630
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发表时间：
2014-07
影响因子：
1.3
通讯作者：
Menghua Kang;Yingli Wang;Liyong Ren;Jin-tao Xu;Jian Liang;Enshi Qu
中科院分区：
文献类型：
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作者：
Menghua Kang;Yingli Wang;Liyong Ren;Jin-tao Xu;Jian Liang;Enshi Qu
为了提高传感器的性能，提出了一种新型高双折射光纤电流传感元件。这种元件包括三个纤维部分。利用沿光纤变化自旋速率的两个终端部分来代替光纤四分之一波片，每个部分将光偏振态从线性转换为圆形，反之亦然。具有均匀自旋速率的中间部分作为电流传感光纤，在光传播过程中保持圆偏振状态。光纤还缠绕成特殊的几何结构，因此可以固有地消除Sagnac相移，并且传感结果不依赖于电流导体的位置。利用耦合模理论分析了传感光纤中不同偏振态入射时光偏振态的演变过程。并提出了一种基于这类纤维的传感器方案。
A novel fiber-optic current sensing element is proposed to enhance sensor performance using spun high-birefringence fibers. Such element includes three fiber sections. Two terminal sections with a varying spin rate along the fiber are utilized to replace the fiber quarter-wave plates, each converting the light polarization state from linear to circular and vice versa. The middle section with a uniform spin rate is utilized as the current sensing fiber that maintains the circular polarization state during the light propagation. The fiber is also wound into a special geometric structure so that the Sagnac phase shift can be inherently eliminated, and the sensing result does not depend on the position of the current conductor. The evolution of the light polarization state was analyzed using coupled-mode theory with different polarization state incidents in the sensing fiber. A sensor scheme based on this type of spun fiber is also proposed.