Optical fibers (OFs) are among the most promising technologies for distributed sensing in structure health monitoring of composites. Optical backscatter reflectometer (OBR) based on Rayleigh scattering enable to use the entire length of telcom OF as sensor, giving detailed information about the stain fields in the host structure. Embedded sensors can provide many advantages over surface bonded ones in terms of reliability and accuracy of the measurements. Here, OFs were embedded in between (0/0), (0/90) and (90/90) interfaces of a [02/902/02] glass fiber reinforced polymer (GFRP) and were further interrogated with OBR during tensile tests. Sensors were evaluated in terms of its sensing capabilities and fracture mechanism. OFs aligned in between (0/0) direction endured 5500 µe and deviated only 2.7% in the Young’s modulus calculation compared to mounted strain gauges. The other directions presented problems related to matrix rich area (0/90) and air bubbles imprisoning (90/90), reducing the sensing range. After reaching the cracking state, OFs fail progressively and are still capable of acting as sensor, as was showed in a simple visible laser scattering test. For the first time, embedding, interrogation with OBR and fracture mechanisms are approached in a single study, which provide valuable information for wide application of OFs in SHM.

中文翻译：

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应用于层压复合材料的分布式光纤传感：嵌入过程、OBR 应变场监测和断裂机制

光纤（OFs）是复合材料结构健康监测中分布式传感最有前途的技术之一。基于瑞利散射的光学背向散射反射计 (OBR) 能够使用整个电信 OF 作为传感器，提供有关主机结构中染色场的详细信息。在测量的可靠性和准确性方面，嵌入式传感器比表面粘合传感器具有许多优势。在这里，OF 嵌入在 [02/902/02] 玻璃纤维增​​强聚合物 (GFRP) 的 (0/0)、(0/90) 和 (90/90) 界面之间，并在拉伸试验期间用 OBR 进一步询问. 根据传感器的传感能力和断裂机制对传感器进行了评估。在 (0/0) 方向之间对齐的 OF 承受了 5500 µe，并且仅偏离了 2。与安装的应变计相比，杨氏模量计算中为 7%。其他方向存在与基质富集区 (0/90) 和气泡束缚 (90/90) 相关的问题，从而降低了传感范围。达到开裂状态后，OF 逐渐失效，仍然能够充当传感器，如简单的可见光激光散射测试所示。首次在一项研究中处理嵌入、OBR 询问和断裂机制，这为 OFs 在 SHM 中的广泛应用提供了有价值的信息。正如一个简单的可见激光散射测试所示。首次在一项研究中处理嵌入、OBR 询问和断裂机制，这为 OFs 在 SHM 中的广泛应用提供了有价值的信息。正如一个简单的可见激光散射测试所示。首次在一项研究中处理嵌入、OBR 询问和断裂机制，这为 OFs 在 SHM 中的广泛应用提供了有价值的信息。