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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 4 — Feb. 1, 2013
  • pp: 734–741

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

Ming Deng, Xiaokang Sun, Meng Han, and Decai Li  »View Author Affiliations

Applied Optics, Vol. 52, Issue 4, pp. 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 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 μm is most sensitive to the external magnetic field, and the sensitivity is up to 64.9pm/mT, which is 20 times higher than that of 125 μm diameter.

© 2013 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(160.4236) Materials : Nanomaterials
(240.3990) Optics at surfaces : Micro-optical devices

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: September 24, 2012
Revised Manuscript: December 6, 2012
Manuscript Accepted: December 9, 2012
Published: January 30, 2013

Ming Deng, Xiaokang Sun, Meng Han, and Decai Li, "Compact magnetic-field sensor based on optical microfiber Michelson interferometer and Fe3O4 nanofluid," Appl. Opt. 52, 734-741 (2013)

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