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Cost-effective optical fiber pressure sensor based on intrinsic Fabry-Perot interferometric micro-cavities

机译：基于内在Fabry-Perot干涉微腔的经济高效的光纤压力传感器

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摘要

In this work, a cost-effective procedure to manufacture optical fiber pressure sensors is presented. This has a high relevance for integration in robotic exoskeletons or for gait plantar pressure monitoring within the physical rehabilitation scenarios, among other applications. The sensing elements are based on Fabry-Perot interferometric (FPI) micro-cavities, created from the recycling of optical fibers previously destroyed by the catastrophic fuse effect. To produce the pressure sensors, the fiber containing the FPI micro-cavities was embedded in an epoxy resin cylinder used as pressure transducer and responsible to transfer the pressure applied on its surface to the optical fiber containing the FPI micro-cavity. Before the embedding process, some FPI sensors were also characterized to strain variations. After that, the effect of the encapsulation of the FPI structure into the resin was assessed, from which a slight decrease on the FPI interferogram fringes visibility was verified, indicating a small increase in the micro-cavity length. Up on the sensors characterization, a linear dependence of the wavelength shift with the induced pressure was obtained, which leads to a maximum sensitivity of 59.39 +/- 1.7 pm/kPa. Moreover, direct dependence of the pressure sensitivity with the microcavity volume and length was found.
机译：在这项工作中，提出了一种制造光纤压力传感器的经济有效的方法。这与集成在机器人外骨骼中或在物理康复方案中进行步态足底压力监测具有高度相关性。传感元件基于Fabry-Perot干涉（FPI）微腔，该微腔是通过回收先前因灾难性熔断效应而损坏的光纤而产生的。为了生产压力传感器，将包含FPI微腔的光纤嵌入用作压力传感器的环氧树脂圆柱体中，并负责将其表面上的压力传递到包含FPI微腔的光纤上。在嵌入过程之前，一些FPI传感器还具有应变变化的特征。此后，评估了将FPI结构封装到树脂中的效果，由此证实了FPI干涉图条纹可见性的轻微降低，表明微腔长度的小幅增加。根据传感器的特性，获得了波长偏移与感应压力的线性关系，这导致最大灵敏度为59.39 +/- 1.7 pm / kPa。此外，发现压力敏感性与微腔体积和长度直接相关。

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