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Applied Optics

Applied Optics


  • Vol. 42, Iss. 10 — Apr. 1, 2003
  • pp: 1769–1772

Faraday-effect optical current sensor with a garnet film/ring core in a transverse configuration

Toshihiko Yoshino, Shin-ichi Torihata, Masayuki Yokota, and Noritaka Tsukada  »View Author Affiliations

Applied Optics, Vol. 42, Issue 10, pp. 1769-1772 (2003)

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A new scheme of the Faraday effect current sensor of a magnetic ring-core type is reported. With this scheme a uniaxial magnetic garnet film is obliquely inserted into a very narrow gap in the ring core and a probe light beam is passed through the garnet film in the transverse direction to the core. It is experimentally demonstrated that this current sensor shows good sensitivity as well as good isolation from surrounding currents, particularly because of the very narrow core gap allowed. This transverse scheme is much simpler and less expensive than the known longitudinal scheme and can offer a practical optical current sensor of a ring-core type.

© 2003 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.3940) Instrumentation, measurement, and metrology : Metrology
(160.3820) Materials : Magneto-optical materials
(230.2240) Optical devices : Faraday effect

Original Manuscript: August 10, 2002
Revised Manuscript: November 7, 2002
Published: April 1, 2003

Toshihiko Yoshino, Shin-ichi Torihata, Masayuki Yokota, and Noritaka Tsukada, "Faraday-effect optical current sensor with a garnet film/ring core in a transverse configuration," Appl. Opt. 42, 1769-1772 (2003)

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  1. T. Yoshino, “Optical fiber sensors for electric industry,” in Fiber Optic Sensors, A. M. Scheggi, ed., Proc. SPIE798, 258–266 (1987).
  2. G. W. Day, A. H. Rose, “Faraday effect sensors: the state of the art,” in Fiber Optic and Laser Sensors, R. P. Depaula, E. Udd, eds., Proc. SPIE985, 138–149 (1988).
  3. Emerging Technologies Working Group, “Optical current transducers for power systems: a review,” IEEE Trans. Power Deliv. 9, 1778–1787 (1994).
  4. J. M. Lopez-Higuera, ed., Handbook of Optical Fiber Sensing Technology (Wiley, New York, 2002).
  5. T. Yoshino, T. Takahasi, T. Shimoyama, “Accurate Faraday effect current sensor,” in Advances in Optical Sensors, B. Culshaw, E. L. Moore, Z. Zhipen, eds., Vol. PM07 of SPIE Press Monograph Series (SPIE Press, Bellingham, Wash., 1992), pp. 208–217.
  6. T. Yoshino, M. Gojuki, Y. Takahashi, T. Shimoyama, “Single glass block Faraday effect current sensor with homogeneous isotropic closed optical circuit,” Appl. Opt. 36, 5566–5573 (1997). [CrossRef] [PubMed]
  7. T. Yoshino, Y. Yokota, K. Aoki, K. Yamamoto, S. Itoi, M. Ohtaka, “Fiber-linked Faraday effect current sensor using a flint glass cell with dielectric-coated retardation-compensated total reflection surfaces,” Appl. Opt. 41, 5963–5968 (2002). [CrossRef] [PubMed]
  8. T. Yoshino, “Highly efficient Faraday rotators using relatively low Verdet constant Faraday materials,” Jpn. J. Appl. Phys. 19, 745–749 (1978). [CrossRef]
  9. T. Yoshino, H. Hara, N. Sakamoto, “Development of highly sensitive optical current sensors,” in Extended Abstracts of Spring Meeting of Japan Society of Applied Physics, Tokyo, March 1988 (Japan Society of Applied Physics, Tokyo, 1988), p. 860.
  10. N. Inoue, K. Yamasawa, “Stabilizing the temperature dependencies of the Verdet constant of a Bi doped garnet and development of a highly sensitive optical magnetic field sensor,” Trans IEE Jpn. 115-A, 1114–1120 (1995).
  11. N. Itoh, H. Minemoto, D. Ishiko, S. Ishizuka, “Optical magnetic field probe sensor with high accuracy using iron garnet films,” in Technical Digests of 11th International Conference on Optical Fiber Sensors, OFS’96, Sapporo, Japan, 1996 (Japan Society of Applied Physics, Tokyo, 1996), pp. 638–641.
  12. T. Yoshino, K. Minegishi, M. Nitta, “Very sensitive fiber-optic current sensor using YIG/ring-core in transverse configuration,” Meas. Sci. Technol. 12, 850–863 (2001). [CrossRef]
  13. T. Numata, H. Tanakaike, S. Inokuchi, S. Sakurai, “Nonlinearity of Faraday loops,” IEEE J. Magn. 26, 1358–1360 (1990). [CrossRef]
  14. T. Numata, M. Yao, S. Inokuchi, Y. Sakurai, “Improved sensitivity in a novel scheme of a magneto-optical field sensor,” IEEE Trans. Magn. 29, 3402–3404 (1993).
  15. R. Wolfe, E. M. Gyogy, R. A. Lieberman, V. J. Fratello, S. J. Licht, M. N. Deeter, G. W. Day, “High frequency magnetic field sensors based on the Faraday effect in garnet thick films,” Appl. Phys. Lett. 60, 2048–2050 (1992). [CrossRef]
  16. T. Yoshino, S. Tanaka, “Theory of polar magneto-optic effects in thin films,” Oyo Buturi 34, 573–581 (1965).
  17. K. Kurosawa, “Optical current transducer using flint glass fiber as the Faraday sensor element,” in Technical Digests of 11th International Conference on Optical Fiber Sensors, OFS’96, Sapporo, Japan, 1996 (Japan Society of Applied Physics, Tokyo, 1996), pp. 134–139.
  18. D. I. Sementsov, R. M. Grechishinkin, Yu. N. Zubkov, “Magneto-optic diffraction by a stripe domain structure with wavy walls,” J. Phys. D 24, 2210–2214 (1991). [CrossRef]

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