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Proceedings Paper

Fiber optic chemical sensor with modified cladding refractive index
Author(s): Huayu Bao; Tingyun Wang
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Paper Abstract

We report a miniature optical fiber chemical sensor that consists of a fused-biconical single-mode optic fiber coupler. The absorption of the evanescent wave changes when the waist cladding refractive index n2 is slightly modified. Consequently, the coupling visibility also changes. By putting the device in the water polluted, the trace amounts of chromium and nitrite in water can be detected. The coupler fabrication and design of the chemical sensor are described. The performance and characteristic of this system clearly establish the usefulness of the technique for detecting very low concentrations of the dissolved contaminants. And the sensor has shown preferable sensitivity and time response.

Paper Details

Date Published: 5 December 2005
PDF: 5 pages
Proc. SPIE 6019, Passive Components and Fiber-based Devices II, 60191E (5 December 2005); doi: 10.1117/12.636113
Show Author Affiliations
Huayu Bao, Shanghai Univ. (China)
Tingyun Wang, Shanghai Univ. (China)

Published in SPIE Proceedings Vol. 6019:
Passive Components and Fiber-based Devices II
Yan Sun; Jianping Chen; Sang Bae Lee; Ian H. White, Editor(s)

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