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Study of strain measurement by fiber optic sensors with a sensitive fiber loop ringdown spectrometer

机译：具有敏感光纤环旋转仪的光纤传感器应变测量研究

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摘要

A sensitive fiber loop ringdown (FLRD) spectrometer without any additional optical component was utilized to obtain strain measurement on a single mode fiber optic sensor. The strain data were obtained by employing the theory of bending loss in single mode fibers. The best sensitivity of the sensors was obtained as 5.99 mu epsilon with an 80.0 cm long sensor head when the sensor heads were stretched at the midpoint. The spectrometer system had a baseline-stability of 0.22%. Stretching the sensor head from off-midpoint positions resulted faster decays with higher optical losses. Comparison of the slopes relative to the stress positions showed that it may be utilized to obtain strain location without using any high-cost equipment. This portable, basic, and simpler FLRD spectrometer system offers high sensitivity with great baseline stability without utilization of any additional optical components and/or creating air-gap/air-cavity and encapsulation on the sensor head region. With its very attractive features of such as easy setup, low cost, and simple design, sensitive FLRD sensors may have a high potential for early detection in several applications such as structural health monitoring, biomedical sensing, mining, transportation and rail applications for continuous monitoring in real-time.
机译：利用没有任何附加光学组件的敏感光纤环旋转（FLRD）光谱仪来获得单模光纤传感器上的应变测量。通过采用单模纤维中的弯曲损失理论获得应变数据。当传感器头在中点拉伸时，通过8.99μmμmεms，获得5.99μmε的最佳灵敏度。光谱仪系统的基线稳定性为0.22％。从离点位置拉伸传感器头部导致更快的光学损耗衰减。倾斜相对于应力位置的斜率的比较表明，在不使用任何高成本设备的情况下可用于获得应变位置。该便携式，基本和简单的FLRD光谱仪系统具有高灵敏度，具有很大的基线稳定性，而不利用任何附加光学部件和/或在传感器头区域上产生气隙/空腔并封装。凭借其具有易于设置，低成本和简单的设计等非常有吸引力的特点，敏感的FLRD传感器可能具有高潜力的早期检测，如结构健康监测，生物医学传感，采矿，运输和轨道应用，用于连续监测实时。

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