引入曲率与角度校正的柔性机构三维形状多芯光纤重构方法  

Three-dimensional shape multi-core fiber reconstruction method of flexible mechanism by introducing curvature and angle correction

作　　者：吕佳豪 董明利[1,2] 何彦霖 孙广开[1,2] 周康鹏 Lv Jiahao;Dong Mingli;He Yanlin;Sun Guangkai;Zhou Kangpeng(Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument,Beijing Information Science&Technology University,Beijing 100192,China;Beijing Laboratory of Optical Fiber Sensing and System,Beijing Information Science and Technology University,Beijing 100016,China;School of Precision Instrument&Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]北京信息科技大学光电测试技术及仪器教育部重点实验室,北京100192 [2]北京信息科技大学光纤传感与系统北京实验室,北京100016 [3]天津大学精密仪器与光电子工程学院,天津300072

出　　处：《红外与激光工程》2021年第5期112-118,共7页Infrared and Laser Engineering

基　　金：国家自然科学基金青年科学基金(61903041);北京市自然基金-市教委联合基金(KZ201911232044);北京市自然科学基金(7202017,4204101)。

摘　　要：为提高柔性机构三维位形参数光纤测量精度,提出了基于曲率与角度校正的多芯光纤三维形状重构方法。通过引入方向角和曲率校正系数,改进了柔性三维形变多芯光纤重构算法;利用准分子激光器和相位掩膜法制备了多芯光纤光栅传感阵列,建立了多芯光纤三维形状重构实验系统;实验测量了不同曲率比例因子下的形状重构误差,分析了曲率与角度校正前后形状重构误差;通过对应变进行了三次样条插值,并对方向角和曲率进行了校正,得到了形状重构误差平均值为0.74 mm、最大值为1.64 mm;利用校正后的多芯光纤传感系统进行三维螺旋形变重构实验,得出重构精度提高了10.2%。研究结果表明,基于曲率与角度校正的多芯光纤三维形状重构方法具有更高精度,在柔性机构三维位形实时监测中具有应用前景。In order to improve the measurement accuracy of the three-dimensional shape of the flexible mechanism,a multi-core optical fiber three-dimensional shape reconstruction method based on curvature and angle correction was proposed.By introducing directional angle and curvature correction coefficients,the flexible three-dimensional deformation multi-core fiber reconstruction algorithm was improved;the multi-core fiber grating sensing array was fabricated by using excimer laser and phase mask method,and the multi-core fiber three-dimensional shape reconstruction experiment system was established;the shape reconstruction error under different curvature scale factors was measured in the experiment,and the shape reconstruction error before and after the curvature and angle correction was analyzed;Through the cubic spline interpolation of the strain and the correction of the direction angle and curvature,the average value of shape reconstruction error was 0.74 mm and the maximum value was 1.64 mm;By using the calibrated multi-core optical fiber sensing system to carry out the three-dimensional helix deformation reconstruction experiment,the reconstruction accuracy was improved by 10.2%.The research results show that the multi-core optical fiber 3D shape reconstruction method based on curvature and angle correction has higher accuracy,showing important application prospects and values in realtime monitoring of the 3D shape of flexible mechanisms.

关 键 词：形状重构 柔性机构 光纤布拉格光栅 多芯光纤 

分 类 号：TN253[电子电信—物理电子学] TH74[机械工程—光学工程]