2D and 3D Shape Sensing Based on 7-Core Fiber Bragg Gratings  

作　　者：Tianting LAI Pu CHENG Congliao YAN Chi LI Wenbin HU Minghong YANG 

机构地区：[1]National Engineering Laboratory for Fiber Optic Sensing Technology,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Photonic Sensors》2020年第4期306-315,共10页光子传感器（英文版）

基　　金：supported in part by Major Technique Innovation Program of Hubei Province of China(Grant No.2018AAA016);the National Natural Science Foundation of China(NSFC)(Grant No.61575151).

摘　　要：A fiber-optic shape sensing based on 7-core fiber Bragg gratings(FBGs)is proposed and experimentally demonstrated.The investigations are presented for two-dimensional(2D)and three-dimensional(3D)shape reconstruction by distinguishing bending and twisting of 7-core optical fiber with FBGs.The curvature and bending orientation can be calculated by acquiring FBG wavelengths from any two side cores among the six outer cores.And the shape sensing in 3D space is computed by analytic geometry theory.The experiments corresponding of 2D and 3D shape sensing are demonstrated and conducted to verify the theoretical principles.The resolution of curvature is about 0.1 m^(-1) for 2D measuring.The error of angle in shape reconstruction is about 1.89°for 3D measuring.The proposed sensing technique based on 7-core FBGs is promising of high feasibility,stability,and repeatability,especially for the distinguishing ability on the bending orientation due to the six symmetrical cores on the cross-section.

关 键 词：Shape sensing fiber Bragg gratings multi-core fiber 

分 类 号：TN253[电子电信—物理电子学] TP212[自动化与计算机技术—检测技术与自动化装置]