A polarization-independent torsion sensor based on the near-helical long period fiber grating  

作　　者：Zhihang Han Cuiting Sun Xiren Jin Hang Jiang Chong Yao Shuo Zhang Weiliang Liu Tao Geng Feng Peng Weimin Sun Libo Yuan 韩志行;孙翠婷;金夕人;蒋航;姚宠;张硕;刘卫亮;耿涛;彭峰;孙伟民;苑立波(College of Science,Harbin Engineering University,Harbin 150001,China;School of Physics and Technology,University of Jinan,Jinan 250022,China;Photonies Research Cellter,Guilin University of Electronics Technology,Guilin 541004,China)

机构地区：[1]College of Science,Harbin Engineering University,Harbin 150001,China [2]School of Physics and Technology,University of Jinan,Jinan 250022,China [3]Photonies Research Cellter,Guilin University of Electronics Technology,Guilin 541004,China

出　　处：《Chinese Optics Letters》2018年第10期1-4,共4页中国光学快报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.61377084,41174161,and 61775044);the Joint Research Fund in Astronomy(No.U1631239)under cooperative agreement between the National Natural Science Foundation of China(NSFC)and the Chinese Academy of Sciences(CAS);in part by the Aeronautical Science Foundation of China(No.201608P6003)

摘　　要：A torsion sensor based on the near-helical(NH)long period fiber grating(LPFG)is fabricated by using a high frequency pulsed CO_(2) laser.Each groove of the NH-LPFG is spirally written in the four sides of a single-mode fiber.The NH-LPFG has a helical periodic vertical index modulation.This is different from the screw-type index modulation of the common helical LPFGs(H-LPFGs)fabricated in a twisted fiber.The torsion and temperature characteristics of the NH-LPFG are experimentally investigated.The temperature sensitivity is about0.0668 nm/℃.The torsion sensitivity is 0.103 nm/(rad/m)and independent of the polarization state of incident light.

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TN95[自动化与计算机技术—控制科学与工程]