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Proceedings Paper

Fiber optic Faraday effect current sensor having square flint-glass block with bilayer dielectric thin-film-coated total reflection surfaces
Author(s): Toshihiko T. Yoshino; Masayuki Yokota; Katsugo Aoki; Ken-ichi Yamamoto; Shun Itoi; Masatoshi Ohtaka
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Paper 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.

Paper Details

Date Published: 8 May 2001
PDF: 4 pages
Proc. SPIE 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), (8 May 2001); doi: 10.1117/12.427014
Show Author Affiliations
Toshihiko T. Yoshino, Gunma Univ. (Japan)
Masayuki Yokota, Gunma Univ. (Japan)
Katsugo Aoki, Gunma Univ. (Japan)
Ken-ichi Yamamoto, Gunma Univ. (Japan)
Shun Itoi, Gunma Univ. (Japan)
Masatoshi Ohtaka, Gunma Univ. (Japan)

Published in SPIE Proceedings Vol. 4416:
Optical Engineering for Sensing and Nanotechnology (ICOSN 2001)
Koichi Iwata, Editor(s)

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