光纤外腔法布里-珀罗直流磁场传感器。

Fiber-optic extrinsic Fabry-Perot dc magnetic field sensor.

作者信息

Oh Ki D, Wang Anbo, Claus Richard O

机构信息

Unicess Networks, Inc., Canada, Calgary, Alberta T3A 2E5, Canada.

出版信息

Opt Lett. 2004 Sep 15;29(18):2115-7. doi: 10.1364/ol.29.002115.

DOI:10.1364/ol.29.002115

PMID:15460874

Abstract

We demonstrate a compact extrinsic Fabry-Perot interferometer-based fiber-optic sensor that uses magnetostrictive amorphous metallic wire Unitika AF-10 (Fe77.5B15Si7.5) as a sensor gauge for measuring dc magnetic fields. We present a theoretical model based on a Gaussian electric field distribution to analyze the sensor operation as a function of longitudinal air-gap separation. The model shows good agreement with the experimental results. A resolution of 50 nT over a range of 50-40,000 nT with a simple passive temperature-compensation method is obtained.

摘要

我们展示了一种基于紧凑型外腔法布里-珀罗干涉仪的光纤传感器，该传感器使用磁致伸缩非晶金属丝Unitika AF-10（Fe77.5B15Si7.5）作为测量直流磁场的传感元件。我们提出了一个基于高斯电场分布的理论模型，以分析传感器作为纵向气隙间距函数的工作情况。该模型与实验结果显示出良好的一致性。通过一种简单的无源温度补偿方法，在50 - 40,000 nT的范围内获得了50 nT的分辨率。