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Sensors 2009, 9(8), 6261-6272; doi:10.3390/s90806261
Article

Gas Sensor Based on Photonic Crystal Fibres in the 2ν3 and ν2 + 2ν3 Vibrational Bands of Methane

1,* , 1
,
1
,
2
 and
1
1 Photonics Engineering Group, University of Cantabria, Avda. de los Castros S/N, 39005 Santander, Spain 2 Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, UK
* Author to whom correspondence should be addressed.
Received: 10 July 2009 / Revised: 3 August 2009 / Accepted: 7 August 2009 / Published: 10 August 2009
(This article belongs to the Special Issue Gas Sensors 2009)
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Abstract

In this work, methane detection is performed on the 2ν3 and ν2 + 2ν3 absorption bands in the Near-Infrared (NIR) wavelength region using an all-fibre optical sensor. Hollowcore photonic bandgap fibres (HC-PBFs) are employed as gas cells due to their compactness, good integrability in optical systems and feasibility of long interaction lengths with gases. Sensing in the 2ν3 band of methane is demonstrated to achieve a detection limit one order of magnitude better than that of the ν2 + 2ν3 band. Finally, the filling time of a HC-PBF is demonstrated to be dependent on the fibre length and geometry.
Keywords: gas detectors; methane; fibre optic sensors; photonic crystal fibres; hollow-core photonic bandgap fibres; absorption spectroscopy gas detectors; methane; fibre optic sensors; photonic crystal fibres; hollow-core photonic bandgap fibres; absorption spectroscopy
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Cubillas, A.M.; Lazaro, J.M.; Conde, O.M.; Petrovich, M.N.; Lopez-Higuera, J.M. Gas Sensor Based on Photonic Crystal Fibres in the 2ν3 and ν2 + 2ν3 Vibrational Bands of Methane. Sensors 2009, 9, 6261-6272.

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