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Gas Sensor Based on Photonic Crystal Fibres in the 2ν3 and ν2 + 2ν3 Vibrational Bands of Methane
Photonics Engineering Group, University of Cantabria, Avda. de los Castros S/N, 39005 Santander, Spain
Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, UK
* Author to whom correspondence should be addressed.
Received: 10 July 2009; in revised form: 3 August 2009 / Accepted: 7 August 2009 / Published: 10 August 2009
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
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MDPI and ACS Style
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.
Cubillas AM, Lazaro JM, Conde OM, Petrovich MN, Lopez-Higuera JM. Gas Sensor Based on Photonic Crystal Fibres in the 2ν3 and ν2 + 2ν3 Vibrational Bands of Methane. Sensors. 2009; 9(8):6261-6272.
Cubillas, Ana M.; Lazaro, Jose M.; Conde, Olga M.; Petrovich, Marco N.; Lopez-Higuera, Jose M. 2009. "Gas Sensor Based on Photonic Crystal Fibres in the 2ν3 and ν2 + 2ν3 Vibrational Bands of Methane." Sensors 9, no. 8: 6261-6272.