Microstructure fibers for sensing gaseous hydrocarbons

Vlastimil Matejec; Jan Mrazek; Ondrej Podrazky; Jiri Kanka; Ivan Kasik; Marie Pospisilova

doi:10.1117/12.722673

16 May 2007 Microstructure fibers for sensing gaseous hydrocarbons

Vlastimil Matejec, Jan Mrazek, Ondrej Podrazky, Jiri Kanka, Ivan Kasik, Marie Pospisilova

Proceedings Volume 6585, Optical Sensing Technology and Applications; 658511 (2007) https://doi.org/10.1117/12.722673
Event: International Congress on Optics and Optoelectronics, 2007, Prague, Czech Republic

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.

Citation Download Citation

Vlastimil Matejec, Jan Mrazek, Ondrej Podrazky, Jiri Kanka, Ivan Kasik, and Marie Pospisilova "Microstructure fibers for sensing gaseous hydrocarbons", Proc. SPIE 6585, Optical Sensing Technology and Applications, 658511 (16 May 2007); https://doi.org/10.1117/12.722673

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