一种基于磁致伸缩效应和光纤光栅的电流传感器  

Current Sensor Based on Magnetostriction and Fiber Bragg Grating

作　　者：董富宁 杨庆[1] 罗曼丹 陈柠 廖伟 Dong Funing;Yang Qing;Luo Mandan;Chen Ning;Liao Wei(State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400030,China)

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《光学学报》2022年第8期43-52,共10页Acta Optica Sinica

基　　金：国家自然科学基金面上项目(52077019)。

摘　　要：提出一种基于超磁致伸缩材料(GMM)和光纤光栅(FBG)的无源非接触型电流传感器,利用COMSOL软件对参考GMM位置以及聚磁装置预留伸缩空间大小及方向、截面边长和上方开口长度等参数进行分析和优化,保证传感FBG粘接区域内的磁力线密集且均匀分布,最后通过双光栅-强度解调系统实现电流信号的温度无关性测量。传感器交直流特性测试表明,传感器在0.8~3.5 A的直流输入下的灵敏度为249.75 mV/A,线性相关系数高达0.9942;在1.6 A的偏置电流作用下,传感器对50 Hz~6.5 kHz的正弦输入信号具有良好的响应能力。同时传感器的温度特性测试证明,双光栅-强度解调方法可在很大程度上消除环境温度变化对输出电压的影响。本文提出的传感器具有体积小、结构简单、性能稳定和成本低等优点,并且具有温度无关特性。A passive and non-contact current sensor based on giant magnetostrictive material(GMM)and fiber Bragg grating(FBG)is proposed.The position of reference GMM,the size and direction of the reserved expansion space of the magnetic concentrator,the side length of the cross section and the length of the upper opening are analyzed and optimized by COMSOL software,so as to ensure the dense and uniform distribution of magnetic force lines in the bonding area of the sensing FBG.Finally,the temperature independence of the current signal is measured by the double grating-intensity demodulation system.The alternating current(AC)and direct current(DC)characteristic test of the sensor shows that the sensitivity of the sensor is 249.75 mV/A under the DC input of 0.8--3.5 A,and the linear correlation coefficient is as high as 0.9942.Under the action of a bias current of 1.6 A,the sensor has a good response ability to the sinusoidal input signal of 50 Hz--6.5 kHz.At the same time,the test of the temperature characteristic of the sensor shows that the double grating-intensity demodulation method can eliminate the influence of ambient temperature on the output voltage to a great extent.The sensor proposed in this paper has the advantages of small size,simple structure,stable performance,and low cost,and has temperature-independent characteristics.

关 键 词：光纤光学 电流传感 磁致伸缩效应 光纤光栅 双光栅-强度解调法 

分 类 号：TN98[电子电信—信息与通信工程]