High sensitivity all-fiber bend sensor based on modal interferences in a ring core fiber  

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作  者:张帆 齐贝贝 苏柏缙 许鸥 秦玉文 Fan Zhang;Beibei Qi;Baijin Su;Ou Xu;Yuwen Qin(Institute of Advanced Photonics Technology,School of Information Engineering,and Guangdong Provincial Key Laboratory of Information Photonics Technology,Guangdong University of Technology,Guangzhou 510006,China)

机构地区:[1]Institute of Advanced Photonics Technology,School of Information Engineering,and Guangdong Provincial Key Laboratory of Information Photonics Technology,Guangdong University of Technology,Guangzhou 510006,China

出  处:《Chinese Optics Letters》2023年第5期31-36,共6页中国光学快报(英文版)

基  金:supported by the National Key R&D Program of China(No.2018YFB1800903);the National Natural Science Foundation of China(No.62005052);the Guangdong Introducing Innovative and Entrepreneurial Teams of“The Pearl River Talent Recruitment Program”(No.2019ZT08X340);the Guangdong Provincial Key Laboratory of Photonics Information Technology(No.2020B121201011);the Key Laboratory of All Optical Network and Advanced Telecommunication Network,Ministry of Education(Beijing Jiaotong University)(No.AON2019002)。

摘  要:We proposed and experimentally demonstrated an all-fiber sensor for measuring bend with high sensitivity based on a ring core fiber(RCF)modal interferometer.The sensor was fabricated by splicing a segment of RCF between two pieces of multimode fiber(MMF)and single-mode fiber(SMF)at the ends of the MMF as lead-in and lead-out.Due to the first segment of the MMF,the transmitted light is coupled into the ring core,silica center,and cladding of the RCF,exciting multiple modes in the RCF.By the modal interferences in the structure,bending sensing can be realized by interrogating the intensity of the interference dip.Experimental results show a high bending sensitivity of-25.63 dB/m^(-1)in the range of 1.0954 m^(-1)to1.4696 m^(-1).In addition,the advantages of the bend sensor,such as small size,low temperature sensitivity,and simple fabrication process,can be used for curvature measurement in building health monitoring.

关 键 词:optical fiber sensor curvature temperature ring core fiber 

分 类 号:TP212[自动化与计算机技术—检测技术与自动化装置]

 

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