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Applied Optics

Applied Optics


  • Vol. 35, Iss. 1 — Jan. 1, 1996
  • pp: 154–157

Fiber-optic Faraday-effect magnetic-field sensor based on flux concentrators

Merritt N. Deeter  »View Author Affiliations

Applied Optics, Vol. 35, Issue 1, pp. 154-157 (1996)

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The principles and performance of a fiber-optic Faraday-effect magnetic-field sensor designed around an yttrium-iron-garnet (YIG) sensing element and two flux concentrators are described. The system design exploits the technique of polarization-rotated reflection in which a single polarization-maintaining optical fiber links the sensor head to the optical source and detection system. In the sensing head, ferrite flux concentrators are magnetically coupled to the YIG sensing element to achieve maximum sensitivity. The system exhibits a noise equivalent field of 6 pT/√Hz and a 3-dB bandwidth of ∼ 10 MHz.

© 1996 Optical Society of America

Original Manuscript: March 21, 1995
Revised Manuscript: August 29, 1995
Published: January 1, 1996

Merritt N. Deeter, "Fiber-optic Faraday-effect magnetic-field sensor based on flux concentrators," Appl. Opt. 35, 154-157 (1996)

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  1. G. A. Massey, D. C. Erickson, R. A. Kadlec, “Electromagnetic field components: their measurement using linear electro-optic and magneto-optic effects,” Appl. Opt. 14, 2712–2719 (1975). [CrossRef] [PubMed]
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  7. Flux concentrators were fabricated from a commercial nickel–zinc ferrite composition (C2050) sold by Ceramic Magnetics, Inc. The material exhibits an initial (low-frequency) permeability of 100, which rolls off to 50 at ∼100 MHz.
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  10. M. N. Deeter, S. Milián Bon, G. W. Day, G. Diercks, S. Samuelson, “Novel bulk iron garnets for magneto-optic magnetic field sensing,” IEEE Trans. Magn. 30, 4464–4466 (1994). [CrossRef]

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