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Optical Engineering

Application of liquid sensor based on surface plasma wave excitation to distinguish methyl alcohol from ethyl alcohol
Author(s): Yi-Chang Cheng; WenKuan Su; JiannHorng Liou
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Paper Abstract

A liquid sensor based on surface plasma wave (SPW) excitation was fabricated by the deposition of an optimized thickness of gold metal film on a prism. This sensor was applied to measure the reflectivity versus resonant angle of the SPW excitation using water, methyl alcohol, and ethyl alcohol of various concentrations as dielectric. An attempt was also made to theoretically estimate the position of the dip, and the result is in good agreement with experiment. The measured positions of dips, which correspond to the resonant angle of the SPW mode, varied with the species of dielectric, making it easy to distinguish methyl alcohol from ethyl alcohol.

Paper Details

Date Published: 1 January 2000
PDF: 4 pages
Opt. Eng. 39(1) doi: 10.1117/1.602366
Published in: Optical Engineering Volume 39, Issue 1
Show Author Affiliations
Yi-Chang Cheng, Chung-Cheng Inst. of Technology (Taiwan)
WenKuan Su, Chung-Cheng Inst. of Technology (Taiwan)
JiannHorng Liou, Chung-Cheng Inst. of Technology (Taiwan)


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