8 May 2001 Fiber optic Faraday effect current sensor having square flint-glass block with bilayer dielectric thin-film-coated total reflection surfaces
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Proceedings Volume 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001); (2001); doi: 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, 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); doi: 10.1117/12.427014; https://doi.org/10.1117/12.427014
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KEYWORDS
Sensors

Coating

Reflection

Tolerancing

Glasses

Dielectrics

Fiber optics sensors

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