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

Applied Optics, ISSN: 1539-4522, Vol: 52, Issue: 4, Page: 734-741
2013
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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 CO laser, and then they were inserted into glass capillaries with water-based FeO 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 μm 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 μm diameter. © 2013 Optical Society of America.

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