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为了提高FBG柔杆空间形状感知系统的重构精度,提出了一种利用3根FBG阵列、具有温度补偿特性的非正交FBG柔杆检测方法。在分析传感系统的误差组成、产生原因的基础上,建立仿真模型得到了各组成误差分别对系统空间形状重构精度的影响,得出减小安装角度误差是提升精度的关键。利用待标定参数与标定方向与实际检测方向夹角大小相关的原理,给出了一种修正安装角度误差的标定方法。经过实验证明,该方法使得系统形状重构最大相对误差降为0.25%,为高精度的三维形状感知系统提供了可靠的检测方法。
In order to improve the reconstruction accuracy of FBG sensing system, a non-orthogonal FBG detection method based on three FBG arrays with temperature compensation is proposed. Based on the analysis of the error components and the causes of the sensing system, the influence of each component error on the shape reconstruction accuracy of the system is obtained by establishing the simulation model. It is concluded that reducing the installation angle error is the key to improve the accuracy. Using the principle that the parameter to be calibrated is related to the angle between the calibration direction and the actual detection direction, a calibration method to correct the installation angle error is given. Experimental results show that the proposed method can reduce the maximum relative error of shape reconstruction to 0.25%, which provides a reliable method for high-precision three-dimensional shape sensing system.