Highly sensitive salinity sensor based on Mach-Zehnder interferometer with double-C fiber

作     者：Ya-nan Zhang Like Li Jincheng Zhao Yong Zhao Ya-nan Zhang;Like Li;Jincheng Zhao;Yong Zhao

作者机构：College of Information Science and EngineeringNortheastern UniversityShenyang 110819China State Key Laboratory of Synthetical Automation for Process IndustriesShenyang 110819China Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement TechnologyQinhuangdao 066004China 

出 版 物：《Fundamental Research》 (自然科学基础研究（英文版）)

年 卷 期：2022年第2卷第2期

页      面：296-302页

学科分类：08[工学] 0803[工学-光学工程] 

基　　金：This work was supported in part by the National Natural Science Foundation of China(Grants No.61933004 and 62075036) the National Natural Science Foundation of Liaoning Province(Grant No.2020-YQ-04) the Fundamental Research Funds for the Central Universities(Grants No.N2002019 and N2104019) the State Key Laboratory of Synthetical Automation for Process Industries(Grant No.2013ZCX09) the Hebei Natural Science Foundation(Grant No.F2020501040). 

主　　题：Optical fiber sensor Salinity sensor Mach-Zehnder interferometer Microfluidic channel Double-C fiber 

摘      要：This paper proposes a highly sensitive,compact,and low-cost optical fiber salinity sensor based on the Mach-Zehnder interferometer.The sensor is constructed using a single mode fiber(SMF)-no-core fiber-double-C fiber(DCF)-NCF-SMF structure,with the DCF prepared by etching the dual side-hole fiber with HF acid.The DCF’s large-size exposed microfluidic channels solve the previous microstructured optical fiber’s challenging liquid filling and replacement problems.Theoretical simulations and experiments demonstrate that the sensor is suitable for high-sensitivity salinity measurement.The sensor exhibits a high salinity sensitivity of-2.26 nm/‰ in the salinity range of 10‰-50‰,as demonstrated by the experimental results.Additionally,the sensor exhibits some fascinating characteristics,including high repeatability,hysteresis,reversibility,and stability.