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
王春霞 1刘云朋2
作者信息
- 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
- 折叠
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[-1.012 με/N,0.987 με/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.
Abstract
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Key words
fiber optic shape sensing/self calibration/angular deviation/sensing rubber rod/combination detection引用本文复制引用
基金项目
河南省科技计划项目(232400411191)
出版年
2024
NETL
NSTL
万方数据