分布式光纤裂缝检测中损耗的数值计算方法

Numerical Method of Power Loss in Distributed Optic-fiber Crack Detection

在分布式光纤裂缝检测技术中,为了从理论上确定功率损耗与裂缝宽度的关系,采用修正曲率半径的方法对经典的弯曲损耗理论模型进行了修正,扩展了经典模型的适用范围,完善了分布式光纤裂缝检测技术的力-光耦合理论。对两种光纤、两种夹角共4个工况分别进行了数值试验和模型试验,结果表明:光纤护套越薄、与缝面夹角越小,灵敏度越高;数值试验结果与模型试验结果符合较好,说明该修正理论模型是有效性,可为发展分布式光纤裂缝检测技术提供适用的理论工具。

To determine the relationship between power loss and crack width in distributed optic-fiber crack detection technology,the classical theoretical model of bend loss was modified by correcting curvature radius in this paper.The application range of classical theoretical model is extended and mechanics-optics coupling theory of distributed optic-fiber crack detection technology is improved.Numerical experiments and model experiments were carried out for 4 cases which involve two fiber types and two angles betw...