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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 5 — Feb. 10, 2007
  • pp: 685–688

Magneto-optic sensor by use of time-division-multiplexed orthogonal linearly polarized light

Changsheng Li, Toshihiko Yoshino, and Xiang Cui  »View Author Affiliations

Applied Optics, Vol. 46, Issue 5, pp. 685-688 (2007)

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A magneto-optic sensor is proposed and experimentally demonstrated. The sensing unit is mainly composed of an electro-optic modulator, a Faraday magneto-optic glass, and two polarizers. Different from the conventional magneto-optic sensors, this sensor utilizes a time-division-multiplexed and alternately polarized light carrier whose azimuthal angle is periodically alterable between two orthogonal linear polarization states. In particular, this sensing scheme is suitable for dc magnetic field or current measurement, and the measurement result is free from the influences of light intensity fluctuation and environmental electromagnetic interference, due to the applications of square-wave modulation and lock-in amplification techniques. The dc magnetic field in the range of ±(0.067 ∼ 20) mT has been remotely measured and the nonlinear error is less than 1.0%.

© 2007 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(230.2090) Optical devices : Electro-optical devices
(230.2240) Optical devices : Faraday effect

ToC Category:
Optical Devices

Original Manuscript: July 10, 2006
Manuscript Accepted: September 6, 2006
Published: January 25, 2007

Changsheng Li, Toshihiko Yoshino, and Xiang Cui, "Magneto-optic sensor by use of time-division-multiplexed orthogonal linearly polarized light," Appl. Opt. 46, 685-688 (2007)

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