Fiber optic Faraday effect current sensor having square flint-glass block with bilayer dielectric thin-film-coated total reflection surfaces

Toshihiko T. Yoshino; Masayuki Yokota; Katsugo Aoki; Ken-ichi Yamamoto; Shun Itoi; Masatoshi Ohtaka

doi:10.1117/12.427014

8 May 2001 Fiber optic Faraday effect current sensor having square flint-glass block with bilayer dielectric thin-film-coated total reflection surfaces

Toshihiko T. Yoshino, Masayuki Yokota, Katsugo Aoki, Ken-ichi Yamamoto, Shun Itoi, Masatoshi Ohtaka

Author Affiliations +

Proceedings Volume 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001); (2001) https://doi.org/10.1117/12.427014
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '01), 2001, Yokohama, Japan

Abstract

A new type of Faraday effect optical current transformer has been developed which uses a square Flint (FR) glass block with dielectric-coated total reflection surfaces as the sensing element. Numerical calculation has shown that coating two dielectric layers of 45.59 nm-thick Ta₂O₅ and 448.35 nm-thick SiO₂ films on an FR glass surface gives rise to no-retardation total internal reflection for the 45 degree(s) incident angle light beam at (lambda) equals840 nm and has large tolerances for film thickness, wavelength and incident angle. A fiber-linked current transformer has been constructed and exhibited high performances including high isolation from surrounding currents and mechanical stability.

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Toshihiko T. Yoshino, Masayuki Yokota, Katsugo Aoki, Ken-ichi Yamamoto, Shun Itoi, and Masatoshi Ohtaka "Fiber optic Faraday effect current sensor having square flint-glass block with bilayer dielectric thin-film-coated total reflection surfaces", Proc. SPIE 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), (8 May 2001); https://doi.org/10.1117/12.427014

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