基于套嵌光纤光栅的高灵敏度光纤电流传感器  

High sensitivity fiber-optic current sensor based on nested fiber grating

作　　者：李贺飞 徐翠萍[1] 田春雨[1] 宫奎[1] 冯飞[1] 徐峰[1] 甄胜来[1] 俞本立[1] 

机构地区：[1]安徽大学光电信息获取与控制教育部重点实验室,安徽合肥230601

出　　处：《量子电子学报》2016年第5期598-603,共6页Chinese Journal of Quantum Electronics

基　　金：国家自然科学青年基金;61108076;安徽省自然科学基金项目;1308085MF91;安徽省教育厅自然科学研究重点项目;KJ2011A009~~

摘　　要：提出了一种基于套嵌光纤光栅的光纤电流传感器,用二次曝光法制作的长周期光栅和布拉格光栅套嵌而成的光纤光栅作为传感元件,在套嵌的光栅表面沉积一层高电阻镍铁合金作为加热电极层.电流通过时对光栅区域加热,引起光栅光谱中心波长漂移,实现了高灵敏度的电流测量。实验结果表明:所设计的光纤电流传感器电流响应灵敏度达到7.2×10^(-2)nm/mA,且具有结构简单、体积小等优点,在高灵敏度的光纤电流检测领域具有广泛的应用价值。A novel fiber-optic current sensor based on a nested fiber grating is proposed.Long period grating fabricated by two-exposure method and Bragg grating are nested to form fiber grating,and it＇s used as sensing element.Surface of the nested fiber grating is sputtered with a layer of high resistance Ni-Fe alloy,which is used as heating electrode layer.When the current passes through,the grating region is heated,which leads to center wavelength of grating spectrum shifting.High sensitivity current measurement is realized.Experimental results show that the current response sensitivity of the designed optical fiber current sensor reaches 7.2×10^（-2） nm/mA.It has the advantages of simple structure,small size,and has wide application value in the field of high sensitivity optical fiber current detection.

关 键 词：纤维与波导光学 光纤电流传感器 套嵌光纤光栅 镍铁合金层 波长漂移 

分 类 号：TN253[电子电信—物理电子学]