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

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...

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Bibliographic Details
Published inSensors (Basel, Switzerland) Vol. 9; no. 8; pp. 6261 - 6272
Main Authors Cubillas, Ana M., Lazaro, Jose M., Conde, Olga M., Petrovich, Marco N., Lopez-Higuera, Jose M.
Format Journal Article
LanguageEnglish
Published Molecular Diversity Preservation International (MDPI) 10.08.2009
MDPI AG
Subjects
absorption spectroscopy
fibre optic sensors
gas detectors
hollow-core photonic bandgap fibres
methane
photonic crystal fibres
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Summary: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.
ISSN:1424-8220
1424-8220
DOI:10.3390/s90806261