采用超磁致伸缩薄膜的光纤磁场传感器  

Optical Fibre Magnetic Field Sensors Employing Giant Magnetostrictive Thin Films

作　　者：刘吉延[1] 斯永敏[1] 李智忠[2] 刘阳[2] 胡永明[2] 

机构地区：[1]国防科技大学航天与材料工程学院,湖南长沙410073 [2]国防科技大学理学院,湖南长沙410073

出　　处：《半导体光电》2004年第3期238-241,共4页Semiconductor Optoelectronics

基　　金：国防科技大学基础研究项目(JC01-01-003)

摘　　要：　采用马赫 曾德尔干涉仪,对TbDyFe超磁致伸缩薄膜/光纤传感器的磁探测性能进行了实验测试。结果表明:在1kHz调制频率附近,传感器对磁场具有最大的信号响应;在恒定直流磁场及调制磁场强度小于1kA/m的条件下,系统输出信号大小随调制磁场强度线性增加;在35～50kA/m的直流磁场范围内,传感器可探测的最小磁场变化为8.6×10-2A/m。The performances of optical fibre magnetic field sensor employing giant magnetostrictive TbDyFe film are tested by using a Mach-Zehnder interferometer. The results show that the sensor exhibits the largest responses against applied magnetic fields at the frequency of about 1 kHz.When the DC magnetic field is maintained at a fixed value,there is a good linearity between the output signal and the AC magnetic field which is below 1 kA/m.Minimum detectable field of 8.6×10-2 A/m is demonstrated in the range of 35～50 kA/m for the DC bias magnetic field and for a l meter long fibre coated with TbDyFe film.

关 键 词：光纤传感器 超磁致收缩薄膜 马赫一曾德尔干涉仪 磁探测 

分 类 号：TP212.13[自动化与计算机技术—检测技术与自动化装置]