We design a high-sensitivity optical-fiber sensor for measurements of displacement and refractive index based on dual-coating-stripped loop-shaped single-mode fibers. For this, we produced two unrelated interference dips as a consequence of different radii of two loop-shaped fibers. Since loop-shaped optical fibers are assigned different tasks at the same time, the two dips present their own characteristics; thus, the parameters of displacement and refractive index can be measured by these two loop-shaped fibers. In order to ensure the accuracy of experimental data, we carried experiments with increasing and decreasing displacement and refractive index. The experimental results show that the refractive index and displacement sensitivities of the sensor are 290.35 nm/RIU,^† 321.35 nm/RIU, and – 554.40 pm/μm, respectively.

中文翻译：

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一种用于位移和折射率测量的高灵敏度两环传感器

我们设计了一种高灵敏度的光纤传感器，用于基于双涂层剥离的环形单模光纤的位移和折射率测量。为此，由于两个环形光纤的半径不同，我们产生了两个不相关的干扰骤降。由于环形光纤同时被分配了不同的任务，因此这两个凹陷具有其自身的特性。因此，位移和折射率的参数可以通过这两根环形纤维来测量。为了确保实验数据的准确性，我们进行了位移和折射率递增和递减的实验。实验结果表明，该传感器的折射率和位移灵敏度分别为290.35 nm / RIU，^† 321.35 nm / RIU和– 554.40 pm /μ米，分别。