A planarized optical fibre designed for 2-dimensional bend monitoring and external refractive index sensing is presented. The approach uses two singlemode waveguides each containing a set of spectrally multiplexed Bragg gratings. To achieve sensitivity to bending and external refractive index the cladding material of the fibre is partially removed through physical machining. This acts to offset the neutral axis, increasing bend sensitivity and exposes the evanescent field of the guided mode permitting external refractive index monitoring. Through collective monitoring of the Bragg grating array real time, multiparameter sensing is attainable allowing new capability for intelligent monitoring.

中文翻译：

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使用扁平光纤和多芯布拉格光栅的弯曲监测和折射率传感

提出了一种用于二维弯曲监测和外部折射率传感的平面化光纤。该方法使用两个单模波导，每个波导包含一组光谱复用布拉格光栅。为了实现对弯曲和外部折射率的敏感性，光纤的包层材料通过物理加工被部分去除。这起到抵消中性轴的作用，增加弯曲灵敏度并暴露导模的渐逝场，允许外部折射率监测。通过实时对布拉格光栅阵列进行集体监测，可以实现多参数传感，从而实现智能监测的新能力。