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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 28, Iss. 11 — Jun. 1, 1989
  • pp: 1991–1994

Fiber optic tachometer based on the Faraday effect

Brian J. Zook and Clifford R. Pollock  »View Author Affiliations


Applied Optics, Vol. 28, Issue 11, pp. 1991-1994 (1989)
http://dx.doi.org/10.1364/AO.28.001991


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Abstract

A fiber optic tachometer is described that uses the Faraday effect in a ferrite to modulate light from a multimode fiber. A yttrium iron garnet (YIG) crystal is used as the magnetooptic modulator. A permanent magnet is placed near the crystal, such that a nearby rotating steel toothed wheel changes the magnetic field inside the crystal, causing modulation of the intensity of the 1.3-μm light. Modulation depths up to 50% have been achieved with signal-to-noise ratios of over 15 dB. A single multimode fiber connects the remote sensor head to the LED light source and detector.

© 1989 Optical Society of America

History
Original Manuscript: June 16, 1988
Published: June 1, 1989

Citation
Brian J. Zook and Clifford R. Pollock, "Fiber optic tachometer based on the Faraday effect," Appl. Opt. 28, 1991-1994 (1989)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-28-11-1991

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