Vector bending sensor based on chirped long-period grating with off-axis micro-helix taper  

作　　者：周健 何学兰 陈宏洲 熊子洋 杨菁 关春颖 苑立波 Jian Zhou;Xuelan He;Hongzhou Chen;Ziyang Xiong;Jing Yang;Chunying Guan;Libo Yuan(Key Laboratory of In-fiber Integrated Optics,Ministry of Education,Harbin Engineering University,Harbin 150001,China;Photonics Research Center,Guilin University of Electronics 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]Photonics Research Center,Guilin University of Electronics Technology,Guilin 541004,China

出　　处：《Chinese Optics Letters》2023年第6期36-42,共7页中国光学快报（英文版）

基　　金：supported in part by the National Natural Science Foundation of China(NSFC)(Nos.62205087,62175049,and 62105077);Natural Science Foundation of Heilongjiang Province in China(No.YQ2021F002);Fundamental Research Funds for the Central Universities(Nos.3072022TS2501 and 3072021CFJ2504);China Postdoctoral Science Foundation(No.2022M710933)。

摘　　要：Vector bending sensing has been consistently growing in many fields.A low-cost and high sensitivity vector bending sensor based on a chirped long-period fiber grating[LPFG]with an off-axis micro helix taper is proposed and experimentally demonstrated.The grating is composed of several sections of single-mode fiber with gradually larger lengths,and the off-axis micro helix tapers with fixed lengths when they are fabricated by using the arc discharge technology.The large refractive index modulation in the micro-helix taper greatly reduces the sensor size.The total length of the sensor is only 4.67 mm.The micro-helix taper-based LPFG can identify the bending direction due to the asymmetric structure introduced by the micro helix.The experimental results show that the transmission spectra of the sensor have distinct responses for different bending directions,and the maximum bending sensitivity is 14.08 nm/m^(-1)in the range from 0.128 m^(-1)to 1.28 m^(-1).The proposed bending sensor possesses pronounced advantages,such as high sensitivity,small size,low cost,and orientation identification,and offers a very promising method for bend measurement.

关 键 词：bending sensor chirped long-period fiber grating off-axis micro helix taper orientation identification 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]