Abstract In traditional fiber macro-bending loss crack sensors, temperature can affect the light source and the fiber link between the light source and the optical splitter, thereby reducing the measurement accuracy of the sensor. In this study, by combining a U-shaped-wound fiber bending loss crack sensor and an optical splitter on the fiber link, we reduce the effect of temperature on the light source and the fiber link. Furthermore, the sensing mechanism of the improved fiber crack sensor is analyzed. Additionally, a comparison between the U-shaped-wound sensor and a butterfly-shaped sensor is carried out to compare both fiber crack sensors. The experimental results indicate that the optical splitter efficiently reduce the effect of temperature on the light source and the fiber link between the light source and the optical splitter and the U-shaped-wound fiber bending loss crack sensor has a better measurement accuracy.

中文翻译：

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一种光分路器改进的U形缠绕光纤宏弯损耗裂纹传感器

摘要 在传统的光纤宏弯损耗裂纹传感器中，温度会影响光源以及光源与分光器之间的光纤链路，从而降低传感器的测量精度。在这项研究中，通过在光纤链路上结合 U 形缠绕光纤弯曲损耗裂纹传感器和分光器，我们减少了温度对光源和光纤链路的影响。进一步分析了改进型光纤裂纹传感器的传感机理。此外，还进行了 U 形缠绕传感器和蝴蝶形传感器之间的比较，以比较两种光纤裂纹传感器。