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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 10 — Apr. 1, 1999
  • pp: 2047–2052

Small optical magnetic-field sensor that uses rare-earth iron garnet films based on the Faraday effect

Nobuki Itoh, Hisashi Minemoto, Daisuke Ishiko, and Satoshi Ishizuka  »View Author Affiliations


Applied Optics, Vol. 38, Issue 10, pp. 2047-2052 (1999)
http://dx.doi.org/10.1364/AO.38.002047


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Abstract

Highly accurate optical magnetic-field probe sensors that use iron garnet films have been developed. New probe-type sensors were designed with a confocal optical system. A new garnet composition, Bi0.98Gd0.92La0.03Y1.07Fe4.72Ga0.28O12, was found that shows high temperature stability for a sensitivity of less than 2.0% from -20 to +80 °C. The linearity error of the sensor output was within 1.0% for alternating magnetic fields from 0.3 to 42 mT. An optical current transformer that uses the proposed sensor has an ac linearity of 1.0% for input current up to nearly 300 A. The sensor realized high performance in actual use.

© 1999 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.4570) Instrumentation, measurement, and metrology : Optical design of instruments
(160.3820) Materials : Magneto-optical materials
(230.2240) Optical devices : Faraday effect
(230.3810) Optical devices : Magneto-optic systems

History
Original Manuscript: August 24, 1998
Revised Manuscript: December 11, 1998
Published: April 1, 1999

Citation
Nobuki Itoh, Hisashi Minemoto, Daisuke Ishiko, and Satoshi Ishizuka, "Small optical magnetic-field sensor that uses rare-earth iron garnet films based on the Faraday effect," Appl. Opt. 38, 2047-2052 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-10-2047

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