Strain transfer in distributed fiber optic sensor with optical frequency domain reflectometry technology
Strain transfer in distributed fiber optic sensor with optical frequency domain reflectometry technology
复制标题
采用光频域反射技术的分布式光纤传感器中的应变传递
DOI：
10.1117/1.oe.58.2.027109
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发表时间：
2019
影响因子：
1.3
通讯作者：
Fengjuan Rong
中科院分区：
文献类型：
--
作者：
Qinghua Zhang;Yangyang Sun;Zhenglin Zhang;Peng Zeng;Jianli Duan;Naishu Zhu;Jingbo Bai;Fengjuan Rong
抽象的。目前光纤传感器应变传递的研究主要集中在高精度、点粘合光纤布拉格光栅传感器。传统的分布式光纤传感器（DOFS）的空间分辨率达到亚米级或米级，并且这些传感器中的应变传递很少被注意到。与以前的传感器相比，我们论文中使用的基于光频域反射计的 DOFS 的精度显着提高。它的精度为0.1，空间分辨率为1毫米。因此，这种高精度DOFS的应变传递性能应该进一步研究。我们使用粘合剂将自由度固定在主体结构上，并研究了影响应变传递的因素，包括“端点效应”、粘合长度、涂层和粘合剂层的剪切模量以及粘合剂层的厚度。设计了DOFS的理论应变传递模型，并利用数值模拟计算了理论应变传递系数。此外，使用均匀强度梁对理论模型进行了评估。实验结果与我们论文中提出的简化的两层应变传递模型一致。从实验和数值模拟结果总结了粘合长度对应变传递的影响，即粘合长度越大，应变传递系数越高，“端点效应”越小。如果纤维涂层和胶水的剪切模量较高，我们就会获得较高的列车传递系数和较小的“端点效应”。这些结论为DOFS在实际中的应用提供了有益的参考。
Abstract. Present research on strain transfer in optical fiber sensors focuses on high-precision, point-bonded fiber Bragg grating sensors. The spatial resolution of a traditional distributed fiber optic sensor (DOFS) reaches submeter or meter, and strain transfer in these sensors is rarely noticed. The accuracy of the DOFS based on optical frequency domain reflectometry used in our paper is improved significantly compared to previous sensors. It has an accuracy of 0.1 and a spatial resolution of 1 mm. Therefore, the strain transfer performance of such a high-precision DOFS should be investigated further. We fixed a DOFS on a host structure using an adhesive, and the factors influencing strain transfer were studied, including the “endpoint effect,” bond length, shear modulus of the coating and adhesive layers, and thickness of the adhesive layer. A theoretical strain transfer model for a DOFS was designed and the theoretical strain transfer coefficient was calculated using numerical simulations. Furthermore, an evaluation of the theoretical model was implemented using a uniform strength beam. The experimental results are consistent with the simplified two-layer strain transfer model presented in our paper. The effect of the bond length on strain transfer is summarized from experimental and numerical simulation results, i.e., a larger adhesive length leads to a higher strain transfer coefficient and smaller “endpoint effect.” If the shear modulus of the fiber coating layer and the glue is high, we obtain a high train transfer coefficient and small “endpoint effect.” These conclusions provide a useful reference for the application of DOFS in practice.