【摘要】 本文研究了一种基于全光纤马赫—曾德尔干涉仪的高灵敏度电流传感器 ,干涉仪的一个臂在细金属套管中穿过 ,对细金属管通以直流电 ,利用电流的热效应对干涉仪的两臂长差进行调谐 ,从而实现了一种相位调制型电流传感器 .实验中在消除环境干扰的情况下 ,采用波长定标法 ,当直流电流在 0～ 1 .8A范围内变化时 ,干涉谱线中的某一特定波长的移动与电功率成正比 ,线性拟合度为 0 .9987,波长最大移动了 32 nm,调谐速率为 1 9.4 7nm/W.更多还原

【Abstract】 A direct current sensor based on all-fiber Mach-Zehnder interferometer is demonstrated in this paper. The phases of interferometric lights in the interferometer is modulated with utilizing heat effect caused by current flowing through a thin metal tube. The character of current sensing is studied experimentally. Adopting the wavelength scale method, in the case of elimination of environmental perturbation, the wavelength changing range is 32nm when the current changes from 0 to 1.8A. The shifting wavelength is linear to the power and the linear fitting is 0.9987. The tuning efficiency is approximately 19.47nm/W.$$$$更多还原