光纤光栅传感器旋转扭转时管道曲率的检测方法

在非开挖地下管线探测中，利用光纤光栅传感器测得地下管线的等距离离散点曲率信息，通过空间曲线重建方法重建出地下管线的空间位置形状，是一种探索中的新方法，在测量地下管线的离散点曲率时，光纤光栅传感器除了承受弯曲变形外，还会发生扭转的情况，该文提出了一种在光纤光栅传感器基材整体旋转或扭转情况下得到离散点曲率的算法，从而提高重建精度，通过模拟算例验证了曲线重建时算法的效果。

Detection of Pipeline Curvature with FBG Sensors Twisted

In trenchless detection of underground pipelines,a method has been introduced which employs fiber brag grating(FBG) sensors to detect curvature of the pipeline at discrete point and reconstructs the spatial trajectory of the pipeline by means of a newly developed reconstruction algorithm.In measuring the pipeline curvature,the FBG sensor may be twisted due to sustaining bending deformation.This paper proposes a new algorithm for curvature calculation at discrete points,considering both total revolving and partial twisting of the FBG sensors in order to enhance the curve-fitting accuracy.Simulation results verify the effectiveness of the method.