基于超高Q值回音壁模式微管腔的非接触式电流传感器研究  

Research of Non⁃Contact Current Sensor Based on Ultra⁃High Q⁃Factor Whispering⁃Gallery Mode Microcapillary Resonator

作　　者：胡建鹏 柴明钢[1,3] 王梦宇 薛彩军 谢成峰[1,2] 谭庆贵 魏斌[1,2] 吴凌峰 吴涛 伏燕军[1,2] Hu Jianpeng;Chai Minggang;Wang Mengyu;Xue Caijun;Xie Chengfeng;Tan Qinggui;Wei Bin;Wu Lingfeng;Wu Tao;Fu Yanjun(Key Laboratory of Optoelectronic Information Science and Technology of Jiangxi Province,Nanchang Hangkong University,Nanchang 330063,Jiangxi,China;Key Laboratory of Nondestructive Test(Ministry of Education),Nanchang Hangkong University,Nanchang 330063,Jiangxi,China;College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,Jiangsu,China;China Academy of Space Technology(Xi’an),Xi’an 710199,Shaanxi,China)

机构地区：[1]南昌航空大学江西省光电信息科学技术重点实验室,江西南昌330063 [2]南昌航空大学无损检测教育部重点实验室,江西南昌330063 [3]南京航空航天大学航空学院,江苏南京210016 [4]中国空间技术研究院西安分院,陕西西安710199

出　　处：《中国激光》2024年第5期166-173,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(62101230,12205136,42175130);江西省自然科学基金(20224BAB202006,20203BBG73039,20232BAB212016,20232BCJ23096,20232ACB212008);重点实验室基金2021-JCJQ-LB-006(6142411512108);江西省教育厅科技项目(GJJ200915)。

摘　　要：研发低功耗、微型化的电流传感器有利于实现电流状态的智能监测,在风力发电、智能电网以及电动汽车等领域有着潜在应用前景。提出一种基于回音壁模式微管腔的非接触式电流传感器。首先通过电弧放电法在薄壁石英管中制备了回音壁模式微管腔,模式谱稳定激发且规则,品质因子Q值达到3.45×10^(7)。其次,在微管腔中填充Fe_(3)O_(4)纳米粒子磁流体并插入Cu丝,构建非接触式电流检测环境,当通入的电流强度发生改变时,与Fe_(3)O_(4)纳米粒子的相互作用引起微管腔的磁热效应,进而影响微管腔的折射率与体积。实验结果表明:测试电流从0增加到30 mA时,微管腔的谐振波长漂移了0.0973 nm,谐振波长的相对漂移量与电流的平方成线性关系,灵敏度达到10.811 nm/A^(2),探测极限达到2.936×10^(-9)A^(2)/nm。所设计的电流传感器具有结构简单、灵敏度高、探测极限低、体积小、不受电磁干扰影响等优势,为微腔在非接触式电流检测中的应用提供了新路径。Objective Current sensors are widely used in modern power electronic systems due to their advantages including high sensitivity,great precision,excellent stability,etc.In the electric power industry,they are extremely important in power measurement,electrical protection and control systems.However,due to the low sensitivity of current transformers,Roche coils and Hall sensors,optical systems seem ideal for current sensing because of their resistance to electro-magnetic interference and fast response.In addition,the problems of miniaturization,process simplicity and high sensitivity of current sensors have not yet been solved.Non-contact current sensors based on whispering-gallery mode(WGM)optical microcavities have the advantages of simplified structure,high sensitivity,low detection limit and small size.The sensor designed has the potential in realizing the intelligent monitoring of the current status for practical applications in the fields of wind power generation,smart grids as well as electric vehicles.Methods A section of thin-walled quartz tube is intercepted to prepare a whispering-gallery mode microcapillary cavity by the method of arc discharge.The microcapillary cavity has a tiny curvature with a surface nanoscale axial photonic structure,which is able to bind more optical modes and improve the storage time of the optical modes,so that the microcapillary cavity with ultra-high quality(Q)factor is prepared.A tapered fiber with a waist diameter of 2μm is prepared for excitation of whispering-gallery modes in the microcapillary cavity using the heat-and-pull technique.Subsequently,we propose a non-contact current sensor based on the ultrahigh Q-factor microcapillary cavity.The copper wire with the diameter of 80μm is put in the center of the microcapillary cavity,and 50%Fe_(3)O_(4) and 100%Fe_(3)O_(4) are filled into the microcapillary cavity,respectively,for comparative study.Subsequently,the optical instrument is adjusted to make the microcapillary cavity coupled with the tapered optical fiber and the

关 键 词：传感器 光学微腔 微管腔 磁热效应 电流检测 微腔传感 

分 类 号：O436[机械工程—光学工程]