基于角度偏差自校正的光纤形状传感结构设计  

Design of Fiber Shape Sensing Structure and Angle Deviation Self-correction Algorithm

作　　者：王春霞[1] 刘云朋[2] WANG Chunxia;LIU Yunpeng(Collage of Mechanical and Electrical Engineering,Jiaozuo University,Jiaozuo 454000,CHN;Collage of Artificial Intelligence,Jiaozuo University,Jiaozuo 454000,CHN)

机构地区：[1]焦作大学机电工程学院,河南焦作454000 [2]焦作大学人工智能学院,河南焦作454000

出　　处：《半导体光电》2024年第1期130-136,共7页Semiconductor Optoelectronics

基　　金：河南省科技计划项目(232400411191)。

摘　　要：光纤形状传感中FBG的放置角度误差会影响曲率的计算精度,从而增大形状反演的误差。为了实现传感胶棒的角度自校正,设计了一种自校正形状传感结构,在传感胶棒的感知截面上布设9个FBG,以120°等角度间隔作为基准位置,分别提取±10°位置上的应变,从而实现FBG响应与角度偏差的函数映射。提出了一种基于角度偏差自校正算法,通过适应度函数完成对传感参量α与k的阈值优化,实现任意角度偏差的自校正。仿真分析不同α与k条件下的响应关系,发现α具有很好的线性变化特性,k仅随主敏感FBG波动的特性。在单截面实验中,加载0~100 N应力变化后,9个FBG的平均响应度介于[-1.012με/N,0.987με/N]之间。响应度的正负可以表征弯曲方向,相邻FBG的响应也具有很好的线性度。在组合截面实验中,根据反演结果重建传感胶棒三维结构,输出各点位坐标和应力值信息。The error in placement angle of the fiber Bragg grating(FBG) in fiber optic shape sensing can affect the accuracy of curvature calculation,thereby increasing the error of shape inversion.To achieve self-correction of the angle of the sensing rubber rod,a self-correction shape sensing structure was designed.Nine FBGs were deployed on the sensing cross-section of the sensing rubber rod,with equal angle intervals of 120° as the reference positions,and strains were extracted at ±10° positions,thereby completing the functional mapping of the FBG response and angle deviation.A self-correction algorithm based on angle deviation is proposed,which optimizes the threshold of sensing parameters α and k through the fitness function to achieve self-correction of any angle deviation.A simulation analysis of the response relationship under different α and k conditions revealed that α had good linear variation characteristics,and k only fluctuated with the main sensitive FBG.In the single section experiment,the average response of the nine FBGs was between [-1.012 με/N,0.987 με/N] after loading 0~100 N stress changes.The positive or negative response characterized the bending direction,and the responses of adjacent FBGs had good linearity.In the composite cross-section experiment,the three-dimensional structure of the sensing rubber rod was reconstructed based on the inversion results,and the coordinates and stress values of each point were output.

关 键 词：光纤形状传感 自校准 角度偏差 传感胶棒 组合探测 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置]