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Proceedings Paper

Microstructure fibers for sensing gaseous hydrocarbons
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Paper Abstract

The paper presents new experimental results on the sensitivity of three types of microstructure fibers (MSFs) modified by xerogel layers to aromatic hydrocarbons, namely to toluene. MSFs with air holes with diameters in a range 10 - 50 &mgr;m, arranged in one, two or three rings, were prepared and their segments were used in sensing experiments. Capillary silica fibers (CFs) were also fabricated for reference sensing measurements. Segments of the fabricated MSFs and CFs were modified by thin xerogel layers applied onto the hole walls by the sol-gel method from sols based on tetraethoxysilane or methyltriethoxysilane. For sensing experiments, the segments were fixed in a special cell making it possible to control the excitation of the fiber and flow of gaseous chemicals through the air holes. The sensitivity of the MSFs and SCFs to gaseous mixtures of toluene in nitrogen was determined from spectral changes of the output light from the fibers in a range of 1600-1800 nm. Experimental results show that the sensitivity of MSFs depends on their architecture, particularly on the arrangement, diameters and number of air holes. A detection limit of about 0.007 vol.% of toluene has been achieved.

Paper Details

Date Published: 16 May 2007
PDF: 9 pages
Proc. SPIE 6585, Optical Sensing Technology and Applications, 658511 (16 May 2007); doi: 10.1117/12.722673
Show Author Affiliations
Vlastimil Matejec, Institute of Photonics and Electronics (Czech Republic)
Jan Mrazek, Institute of Photonics and Electronics (Czech Republic)
Ondrej Podrazky, Institute of Photonics and Electronics (Czech Republic)
Jiri Kanka, Institute of Photonics and Electronics (Czech Republic)
Ivan Kasik, Institute of Photonics and Electronics (Czech Republic)
Marie Pospisilova, Institute of Photonics and Electronics (Czech Republic)

Published in SPIE Proceedings Vol. 6585:
Optical Sensing Technology and Applications
Francesco Baldini; Jiri Homola; Robert A. Lieberman; Miroslav Miler, Editor(s)

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