Gauge factors of fibre Bragg grating strain sensors in different types of optical fibres
Gauge factors of fibre Bragg grating strain sensors in different types of optical fibres
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DOI：
10.1088/0957-0233/24/9/094007
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发表时间：
2013-09-01
影响因子：
2.4
通讯作者：
Roths, Johannes
中科院分区：
文献类型：
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作者：
Juelich, Florian;Aulbach, Laura;Roths, Johannes
在室温条件下，对3种不同芯径和掺杂浓度的光纤进行了高精度的应变传感器应变计因子测试。对每种纤维的几个样品进行重复测量，以进行统计评估。对于每种类型，测量的应变系数在两种配置：当裸光纤被粘在一个标本上的位置的FBG和当他们垂直悬挂，而不是绑定到任何结构的位置的FBG。通过结合这两种配置的结果，胶合过程的应变传递比和不同类型的纤维的应变光学系数p（eff）被确定。发现对于不同类型的光纤，应变光学系数的变化高达1.5%。获得的应变传递率接近于1（> 99%），表明所采用的胶合技术的高质量。调查表明，高精度的应变传感是可能的光纤应变传感器。这些结果对于开发涂层传感器光纤和光纤传感器贴片的准确可靠的附着技术具有重要意义。
Gauge factors of fibre Bragg grating (FBG)-based strain sensors that had been inscribed into three different types of optical fibres, which differ in core diameters and doping concentrations, were determined at room temperature with high accuracy. Repeated measurements were carried out with several samples of each type of fibre to allow statistical evaluations. For each type, the gauge factors were measured in two configurations: when the bare fibres were glued on a specimen at the location of the FBG and when they were vertically suspended and not bonded to any structure at the location of the FBG. By combining the results of both configurations, the strain transfer ratio of the gluing process and the strain-optic coefficient, p(eff), of the different types of fibres were determined. The strain-optic coefficient was found to vary up to 1.5% for the different types of optical fibres. The strain transfer ratio was obtained to be close to unity (> 99%), showing the high quality of the gluing technique employed. The investigations demonstrate that highly accurate strain sensing is possible with fibre-optic strain sensors. The results are important for the development of accurate and reliable attaching techniques for coated sensor fibres and fibre-optic sensor patches.