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Proceedings Paper

Optical fiber liquid-level sensor using a surface plasmon resonance
Author(s): Mitsuhiro Iga; Atsushi Seki; Kazuhiro Watanabe
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Paper Abstract

A liquid-level optical fiber sensor based on refractive index sensitivity of surface plasmon resonance has been proposed and demonstrated. The sensor can continuously measure a wide distance range in the liquids with a single fiber element, since the sensing interface is characterized on the fiber-cladding surface. The fiber element, having the gold film thickness of 70nm on the sensing surface, shows the capability for the use of refractive index to be sensed ranged from 1.333 to 1.428 RIU. The sensitivity has been experimentally achieved to be 2.86% change of the input light intensity per millimeter for the 40mm measurement range.

Paper Details

Date Published: 28 September 2005
PDF: 8 pages
Proc. SPIE 5952, Optical Fibers: Applications, 59521D (28 September 2005); doi: 10.1117/12.622756
Show Author Affiliations
Mitsuhiro Iga, Soka Univ. (Japan)
Atsushi Seki, Soka Univ. (Japan)
Kazuhiro Watanabe, Soka Univ. (Japan)

Published in SPIE Proceedings Vol. 5952:
Optical Fibers: Applications
Leszek R. Jaroszewicz; Brian Culshaw; Anna Grazia Mignani, Editor(s)

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