Compact magnetic-field sensor based on optical microfiber Michelson interferometer and Fe3O4 nanofluid

被引：73
作者：
Deng, Ming [1 ]
Sun, Xiaokang [1 ]
Han, Meng [1 ]
Li, Decai [2 ]
机构：
[1] Chongqing Univ, Educ Minist China, Key Lab Optoelect Technol & Syst, Chongqing 400044, Peoples R China
[2] Beijing Jiaotong Univ, Sch Mech Elect & Control Engn, Beijing 100044, Peoples R China
来源：
APPLIED OPTICS | 2013年 / 52卷 / 04期
基金：
中国国家自然科学基金;
关键词：
REFRACTIVE-INDEX; FLUID FILMS; FIBER; WRITTEN;
D O I：
10.1364/AO.52.000734
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We report a magnetic-field sensor by merging the advantages of optical fiber Michelson interferometers with that of magnetic fluid. Compact and low-cost optical fiber Michelson interferometers were first fabricated by a high-frequency CO2 laser, and then they were inserted into glass capillaries with water-based Fe3O4 magnetic fluid as sensing elements. The sensing characteristics have been investigated and the experimental results show that the reflective spectrum of the fiber-magnetic sensor linearly shifted with the change of the magnetic-field strength that is perpendicular to the axial of the devices. The fiber-magnetic sensor with interference arm's diameter of 50 mu m is most sensitive to the external magnetic field, and the sensitivity is up to 64.9 pm/mT, which is 20 times higher than that of 125 mu m diameter. (C) 2013 Optical Society of America
引用
收藏
页码：734 / 741
页数：8
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