Design of Microstructured Flat Optical Fiber for Multiaxial Strain Monitoring in Composite Materials
Design of Microstructured Flat Optical Fiber for Multiaxial Strain Monitoring in Composite Materials
复制标题
用于复合材料多轴应变监测的微结构平面光纤设计
DOI：
10.1109/jlt.2022.3186912
复制
发表时间：
2022-09-01
影响因子：
4.7
通讯作者：
Prudenzano, Francesco
中科院分区：
文献类型：
--
作者：
Anelli, Francesco;Annunziato, Andrea;Prudenzano, Francesco
设计了一种新颖的微结构扁平光纤，以获得用于复合材料监测的多轴应变传感器。传感区域由两个小孔构成，布拉格光栅写入小孔。为了实现多轴感测，将合适的微结构设计成仅靠近一个孔眼。应变场的影响，通过三维有限元方法的方法进行评估，被认为是获得的折射率分布的变化。利用电磁模态分析和耦合模理论来评估慢轴和快轴基模的布拉格波长偏移，在两个孔眼中引导并影响传感器响应。所设计的微结构扁平光纤在技术上是可行的，并承诺传感性能高于传统的光纤。此外，扁平光纤可以嵌入复合材料中，减少与取向和过量树脂相关的缺点。
An innovative microstructured flat optical fiber is designed to obtain a multiaxial strain sensor for composite material monitoring. The sensing regions are constituted by the two eyelets where Bragg gratings are written. To achieve multiaxial sensing, a suitable microstructure is designed close to only one of the eyelets. The effect of the strain field, evaluated via a 3D finite element method approach, is considered to obtain the change of the refractive index distribution. The electromagnetic modal analysis and the coupled mode theory are exploited to evaluate the Bragg wavelength shift for the slow and fast axis fundamental modes, guided in the two eyelets and affecting the sensor response. The designed microstructured flat optical fiber is technologically feasible and promises sensing performance higher than that obtainable with the conventional optical fibers. In addition, flat optical fiber can be embedded in composite materials reducing the drawbacks related to both orientation and excess resin.