基于非绝热型微光纤的高灵敏度磁场传感器  

High-Sensitivity Magnetic Field Sensor Based on Non-Adiabatic Micro-Fiber

作　　者：齐晨英 徐常平 白扬博 李斌[1] 苗银萍[1] Qi Chenying;Xu Changping;Bai Yangbo;Li Bin;Miao Yinping(Tianjin Key Laboratory of Film Electronic&Communicate Devices,School of Electrical and Electronic Engineering,Tianjin University of Technology,Tianjin 300384,China)

机构地区：[1]天津理工大学天津市薄膜电子与通信器件重点实验室,电气电子工程学院,天津300384

出　　处：《中国激光》2021年第24期134-140,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(11874281);天津市自然科学基金重点项目(17JCZDJC31700,18JCTPJC49200)。

摘　　要：利用熔接机电弧放电和氢气火焰加热相结合的方法,在光纤直径骤减的锥区中心位置制得非绝热型微光纤。该光纤结构具有较强的倏逝场,可以大幅增强光与物质的相互作用。将其与磁流体进行集成,基于磁流体的磁场可调谐折射率变化特性,能够实现对外界弱磁场的快速测量。研究结果表明,在0~150 Oe的磁场强度范围内,灵敏度可达193.28 pm/Oe,探测极限约为0.187 Oe,并且其灵敏度随着干涉峰波长的增大而增大。该传感器具有体积小、成本低、制作方法简单等优点,在电磁场检测领域具有良好的应用前景。Objective Electromagnetic fields have the substantial interference and influence on electronic device systems,and their online detection has been a persistent problem in sensor and detection technologies.Furthermore,the environmental conditions for electromagnetic field measurement are challenging,and traditional sensors are huge and have poor anti-interference ability.Optical-fiber magnetic field sensors are compact and have high sensitivity and strong environmental adaptability,which can withstand high temperature,nuclear radiation and electromagnetic interference.Therefore,it has good application potential in online electromagnetic field detection.Magnetic fluid is a new type of functional material with an adjustable refractive index,birefringence and light transmittance.It combines the characteristics of solid magnetic material with the fluidity of a liquid,making it easy to integrate with optical fiber.In this study,we propose a non-adiabatic optical-fiber magnetic field sensor,which is made by combining arc discharge with hydrogen flame heating.It can realize the rapid and accurate measurement of an external weak magnetic field.The basic strategy and research results will help in the development of a new opticalfiber magnetic field sensor.Methods First,two cascaded concave cones were fabricated on a single-mode fiber using arc discharge.The singlemode fiber with a concave cone structure was then fixed on the flame taper machine’s motor,and the hydrogen flame was manually adjusted to align with the concave cone structure for drawing.The spectrum changes during the preparation of micro-fiber were observed in real time using a spectrometer.Then,the supercontinuum source is used as the light source,and the cone is placed between the two coils.The electrified coil produces a uniform vertical magnetic field,and the voltage changes the magnetic field intensity.The effect of magnetic field intensity on the wavelength shift was investigated using a spectrometer to analyse the spectrum with the change of the magnet

关 键 词：光纤传感器 磁场检测 磁流体 非绝热型 微光纤 

分 类 号：O436[机械工程—光学工程]