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Optics Letters

Optics Letters


  • Vol. 29, Iss. 18 — Sep. 15, 2004
  • pp: 2115–2117

Fiber-optic extrinsic Fabry-Perot dc magnetic field sensor

Ki D. Oh, Anbo Wang, and Richard O. Claus  »View Author Affiliations

Optics Letters, Vol. 29, Issue 18, pp. 2115-2117 (2004)

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We demonstrate a compact extrinsic Fabry–Perot interferometer-based fiber-optic sensor that uses magnetostrictive amorphous metallic wire Unitika AF-10 (Fe77.5B15Si7.5) as a sensor gauge for measuring dc magnetic fields. We present a theoretical model based on a Gaussian electric field distribution to analyze the sensor operation as a function of longitudinal air-gap separation. The model shows good agreement with the experimental results. A resolution of 50 nT over a range of 50–40,000 nT with a simple passive temperature-compensation method is obtained.

© 2004 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.3180) Instrumentation, measurement, and metrology : Interferometry

Ki D. Oh, Anbo Wang, and Richard O. Claus, "Fiber-optic extrinsic Fabry-Perot dc magnetic field sensor," Opt. Lett. 29, 2115-2117 (2004)

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  1. R. O. Claus, M. F. Gunther, A. Wang, and K. A. Murphy, Smart Mater. Struct. 1, 237 (1992).
  2. R. B. Wagreich and C. C. Davis, J. Lightwave Technol. 14, 2246 (1996).
  3. C. M. Dube, S. Thordarson, and K. H. Wansor, Proc. SPIE 838, 17 (1987).
  4. G. P. Agrawal, Fiber-Optic Communication Systems (Wiley, New York, 1992), pp. 22–74.
  5. D. Marcuse, Bell Syst. Tech. J. 56, 703 (1977).
  6. J. D. Livingstone, Phys. Status Solidi 70, 591 (1982).
  7. K. A. Murphy, M. F. Gunther, A. M. Vengsarkar, and R. O. Claus, Opt. Lett. 16, 273 (1991).
  8. Ki. D. Oh, J. Ranade, V. Arya, A. Wang, and R. O. Claus, IEEE Photon. Technol. Lett. 9, 797 (1997).

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