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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 28 — Oct. 1, 2002
  • pp: 5963–5968

Fiber-Linked Faraday Effect Current Sensor by Use of a flint Glass Cell with Dielectric-Coated Retardation-Compensated Total Reflection Surfaces

Toshihiko Yoshino, Masayuki Yokota, Katsugo Aoki, Ken-ichi Yamamoto, Shun Itoi, and Masatoshi Ohtaka  »View Author Affiliations


Applied Optics, Vol. 41, Issue 28, pp. 5963-5968 (2002)
http://dx.doi.org/10.1364/AO.41.005963


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Abstract

A new type of Faraday effect optical current transformer has been developed that uses a single block of square flint glass with dielectric-coated total reflection surfaces as the sensing element. Numerical calculation has shown that the coating of two dielectric layers of 45.59-nm-thick Ta<sub>2</sub>O<sub>5</sub> and 448.35-nm-thick SiO<sub>2</sub> films on a flint glass surface produces zero retardation total reflection for the 45° incident angle of light at λ = 840 nm with great incident angle, wavelength, and film thickness tolerances. A fiber-linked current transformer has been constructed and experimentally demonstrated to exhibit high isolation from surrounding currents as well as high stability against mechanical disturbances.

© 2002 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(230.2240) Optical devices : Faraday effect
(310.1620) Thin films : Interference coatings

Citation
Toshihiko Yoshino, Masayuki Yokota, Katsugo Aoki, Ken-ichi Yamamoto, Shun Itoi, and Masatoshi Ohtaka, "Fiber-Linked Faraday Effect Current Sensor by Use of a flint Glass Cell with Dielectric-Coated Retardation-Compensated Total Reflection Surfaces," Appl. Opt. 41, 5963-5968 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-28-5963


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References

  1. T. Yoshino, Y. Takahashi, and T. Simoyama, “Accurate Faraday effect current sensor,” in Advances in Optical Fiber Sensors, B. Culshaw, E. L. Moore, and Z. Zhang, eds. (SPIE Press, Bellingham, Wash., 1992), pp. 208–217.
  2. T. Yoshino, M. Gojuki, Y. Takahashi, and T. Shimoyama, “Single glass block Faraday effect current sensor with homogeneous isotropic closed optical circuit,” Appl. Opt. 36, 5566–5573 (1997).
  3. K. B. Rochford, A. H. Rose, M. N. Deeter, and G. W. Day, “Faraday effect current sensor with improved sensitivity-bandwidth product,” Opt. Lett. 19, 1903–1905 (1994).
  4. J. H. Apfel, “Phase retardance of periodic multiplayer mirrors,” Appl. Opt. 21, 733–738 (1982).
  5. P. G. Kard, “On the influence of thin films on total reflection,” Opt. Sepctrosc. 51, 339–341 (1959).
  6. M. Born and E. Wolf, Principles of Optics (Pergamon, New York, 1964), p. 49.
  7. Ref. 6, p. 62.

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