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设计了一种新颖的光纤扭角传感器。将两个与尼龙线绞合形成且参数完全相同的光纤段以相反的绕向缠紧在扭轴上,借助它们所产生的微弯损耗随扭角呈差动变化的关系实现检测。基于扭转理论和光纤微弯损耗理论,深入阐述了传感检测机制,并进行了数值仿真。利用PVC模拟扭轴制备了实物装置且进行了相关实验测试。结果表明:在-70~70度角的变化范围内,它能实现双向检测而且正反向响应一致,线性拟合灵敏度为0.0081d B/(m·degree)。鉴于其所具有的特点,此种传感器在扭角检测的相关领域将具有特殊的应用前景。
A novel optical fiber torsion sensor is designed. The two optical fiber strands formed by twisting nylon threads and having the same parameters are wound on the torsion shafts in the opposite winding directions, and the microbending loss generated by them is detected in a differential relationship with the torsion angle. Based on the theory of torsion and the theory of fiber microbend loss, the sensing detection mechanism is deeply explained and the numerical simulation is carried out. The PVC was used to simulate the torsion axis and a physical device was prepared and tested. The results show that it can achieve bidirectional detection within the range of -70 ~ 70 °, and the positive and negative responses are consistent. The linear fitting sensitivity is 0.0081d B / (m · degree). Due to its characteristics, such sensors will have particular application prospects in the related fields of torsional angle detection.