基于磁致折变效应的掺铒光纤磁场传感器温度特性研究  

Temperature Characteristics of Er-Doped Fiber Magnetic Field Sensor Based on Magneto-Refractive Effect

作　　者：刘思晨 黄怿[1] 邓传鲁[1] 胡程勇 黄彩红 董艳华[1] 张小贝[1] 王廷云[1] Liu Sichen;Huang Yi;Deng Chuanlu;Hu Chengyong;Huang Caihong;Dong Yanhua;Zhang Xiaobei;Wang Tingyun(Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学特种光纤与光接入网重点实验室,上海200444

出　　处：《中国激光》2022年第9期157-165,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(61735009,61875116,61875118,62022053)。

摘　　要：对基于磁致折变效应的掺铒光纤磁场传感器的温度特性进行了理论分析和实验测量。理论上,基于密度泛函理论(Density Functional Theory,DFT)研究了温度对掺铒光纤磁致折变效应的影响,结果表明,温度升高会增大掺铒石英材料的原子磁矩,从而增强其磁致折变效应。实验上,基于磁致折变效应,以掺铒光纤作为Mach-Zehnder光纤干涉仪的传感臂,研制了磁场传感器,结果表明,干涉波谷的谐振波长随温度的升高发生红移,传感器的磁场灵敏度随之增加,16.7℃和43.5℃温度下传感器的灵敏度分别为12.63pm/mT和25.53pm/mT,温度变化会影响磁场的测量精度。Objective Optical-fiber magnetic field sensors have advantages such as small size,light weight,high temperature resistance,corrosion resistance,and high sensitivity,which can realize distributed sensing and long-distance signal transmission.Its technology has been a popular research issue in magnetic field sensing area.Optical-fiber magnetic field sensors can be approximately classified into three types:Faraday effect,magnetostrictive effect,and magnetic fluid.However,fiber bending may cause the linear birefringence effect,which influences the measurement accuracy of the sensors based on Faraday effect.The sensors based on the magnetostrictive effect is not suitable for repeated detection owing to the hysteresis and nonlinear effect,which happens to the most magnetostrictive materials.The stability of the sensors based on magnetic fluid is low owing to the volatileness and the temperature sensitivity of magnetic fluid.In recent years,the magneto-refractive effect of rare-earth-doped fibers has been a popular research issue.It is an effective technical solution to use the magneto-refractive effect of fibers for magnetic field sensing,which can overcome the disadvantages of the above sensors.However,the ambient temperature influences the magneto-refractive effect of fibers,which may affect the measurement accuracy.Therefore,there is significant value to studying the temperature characteristics of magnetic field sensors based on the magneto-refractive effect of fibers.Methods The magneto-refractive effect of Er-doped fiber is analyzed by Gaussian software based on the density functional theory(DFT).Considering the computing resources,3-membered-rings(3MR)is used to build the microstructure model for Er-doped materials.6-31+G basis is used to calculate oxygen,hydrogen,and silicon elements.The Stuttgart pseudo-potential MWB28 basis is used to calculate the erbium element in the model.The structural parameters and atomic magnetic moments of the Er-doped-3MR model at different temperatures are calculated for studying th

关 键 词：传感器 磁致折变效应 掺铒光纤 温度特性 磁场传感 MACH-ZEHNDER干涉仪 

分 类 号：TN253[电子电信—物理电子学]