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Proceedings Paper

Development of new optical fiber toluene sensor
Author(s): Yasunari Fujii; Satoshi Honma; Masayuki Morisawa; Shinzo Muto
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Paper Abstract

This paper deals with experimental results on detection of toluene dispersed in water by means of a new and simple plastic optical fiber (POF) sensor. Its sensing part consists of swelling polymer cladding layer such as high density polyethylene (HDPE) with slightly larger refractive index n2 than that of poly(methyl methacrylate) (PMMA) core with n1. When is exposed to toluene dispersed in water, HDPE cladding layer causes swelling and the value of n2 decreases quickly. Then the POF structure in the sensing part changes from leaky-type to guided-one and the output light intensity increases dramatically. By measuring this light intensity change, it becomes possible to detect toluene concentration. In addition, as compared with the popular evanescent-wave detection principle type, this sensor operation does not depend on the wavelength of light source. Therefore, we can use an inexpensive LED or LD in visible region. In experiment, detection of less than 1 wt% toluene in water was easily obtained with fast response about only 1 s. Furthermore, this sensor can detect pure toluene even for a small amount below 1 ml.

Paper Details

Date Published: 24 January 2008
PDF: 8 pages
Proc. SPIE 6829, Advanced Materials and Devices for Sensing and Imaging III, 68291Z (24 January 2008); doi: 10.1117/12.758019
Show Author Affiliations
Yasunari Fujii, Univ. of Yamanashi (Japan)
Satoshi Honma, Univ. of Yamanashi (Japan)
Masayuki Morisawa, Univ. of Yamanashi (Japan)
Shinzo Muto, Univ. of Yamanashi (Japan)

Published in SPIE Proceedings Vol. 6829:
Advanced Materials and Devices for Sensing and Imaging III
Anbo Wang; Yimo Zhang; Yukihiro Ishii, Editor(s)

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