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Fiber Fabry-Perot interferometer for curvature sensing

机译：光纤法布里-珀罗干涉仪，用于曲率检测

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摘要

A curvature sensor based on an Fabry-Perot (FP) interferometer was proposed. A capillary silica tube was fusion spliced between two single mode fibers, producing an FP cavity. Two FP sensors with different cavity lengths were developed and subjected to curvature and temperature. The FP sensor with longer cavity showed three distinct operating regions for the curvature measurement. Namely, a linear response was shown for an intermediate curvature radius range, presenting a maximum sensitivity of 68.52 pm/m-1. When subjected to temperature, the sensing head produced a similar response for different curvature radii, with a sensitivity varying from 0.84 pm/°C to 0.89 pm/°C, which resulted in a small cross-sensitivity to temperature when the FP sensor was subjected to curvature. The FP cavity with shorter length presented low sensitivity to curvature.
机译：提出了一种基于法布里-珀罗（FP）干涉仪的曲率传感器。将毛细管石英管熔接在两个单模光纤之间，从而产生FP腔。开发了两个具有不同腔长的FP传感器，它们经受了曲率和温度的影响。具有较长腔的FP传感器显示了三个不同的曲率测量工作区域。即，示出了对于中间曲率半径范围的线性响应，呈现出68.52pm / m-1的最大灵敏度。当受到温度影响时，感测头对于不同的曲率半径会产生类似的响应，其灵敏度在0.84 pm /°C至0.89 pm /°C之间变化，这导致在使用FP传感器时对温度的交叉灵敏度较小弯曲。长度较短的FP腔对曲率的敏感性较低。

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