Highly sensitive torsion sensor based on Mach–Zehnder interference in helical seven-core fiber taper  

作　　者：王佳斌 曾欣喆 周建 郝佳玉 杨星宇 刘跃 陈文焕 李松 严云翔 耿涛 孙伟民 苑立波 Jiabin Wang;Xinzhe Zeng;Jian Zhou;Jiayu Hao;Xingyu Yang;Yue Liu;Wenhuan Chen;Song Li;Yunxiang Yan;Tao Geng;Weimin Sun;and Libo Yuan(Key Laboratory of In-fiber Integrated Optics,Ministry of Education,Harbin Engineering University,Harbin 150001,China;Qingdao Innovation and Development Center of Harbin Engineering University,Qingdao 266000,China;Photonics Research Center,School of Electronic Engineering and Automation,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]Key Laboratory of In-fiber Integrated Optics,Ministry of Education,Harbin Engineering University,Harbin 150001,China [2]Qingdao Innovation and Development Center of Harbin Engineering University,Qingdao 266000,China [3]Photonics Research Center,School of Electronic Engineering and Automation,Guilin University of Electronic Technology,Guilin 541004,China

出　　处：《Chinese Optics Letters》2023年第4期37-42,共6页中国光学快报（英文版）

基　　金：supported in part by the Joint Research Fund in Astronomy under Cooperative Agreement between the National Natural Science Foundation of China(NSFC) and the Chinese Academy of Sciences(CAS)(Nos.U2031132 and U2031130);the National Natural Science Foundation of China(No.12103015);the Fundamental Research Funds for the Central Universities to the Harbin Engineering University。

摘　　要：We propose a high-sensitivity bidirectional torsion sensor using a helical seven-core fiber taper embedded in multimode fiber(MHSTM).Sensors with different taper waists and helical pitches are fabricated,and their transmission spectra are obtained and analyzed.The waist and length of the sandwiched seven-core fiber are finally determined to be 68 μm and3 mm,respectively.The experimental results show that the clockwise and counterclockwise torsion sensitivities of the proposed sensor are 2.253 nm/(rad/m) and-1.123 nm/(rad/m),respectively.When tapered waist diameter reduces to48 μm,a superior torsion sensitivity of 5.391 nm/(rad/m) in the range of 0-4.24 nm/(rad/m) is obtained,which is 46 times as large as the traditional helical seven-core fiber structure.In addition,the MHSTM structure is also relatively stable to temperature variations.

关 键 词：torsion sensor Mach–Zehnder interferometer multicore fiber helical taper structure 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]