期刊
APPLIED OPTICS
卷 52, 期 4, 页码 734-741出版社
OPTICAL SOC AMER
DOI: 10.1364/AO.52.000734
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资金
- Project of National Natural Science Foundation of China [61107046]
- Nature Science Foundation Project of CQ CSTC [cstc2012jjA4007]
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
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