Sensors · 2009 · 39 citations · 16 references
EngineeringMaterials SciencePhysicsOptical MaterialsPhotonicsSensorsAbsorption SpectroscopyFiber OpticsGas SensorsOptical FibersOptical SensingOptical SensorsGas SensingMethaneMethane AbsorptionMethane DetectionOptical Fiber SensorsPhotonic Crystal FibersVibrational Absorption BandsVibrational Bands
In this work, methane detection is performed on the 2ν(3) and ν(2) + 2ν(3) absorption bands in the Near-Infrared (NIR) wavelength region using an all-fibre optical sensor. Hollow-core 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 2ν(3) band of methane is demonstrated to achieve a detection limit one order of magnitude better than that of the ν(2) + 2ν(3) band. Finally, the filling time of a HC-PBF is demonstrated to be dependent on the fibre length and geometry.
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The HITRAN 2004 molecular spectroscopic database
Laurence S. Rothman, D. Jacquemart, A. Barbé et al. · Journal of Quantitative Spectroscopy and Radiative Transfer · 2005 · 2.7K citations
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T. Ritari, Jesse Tuominen, H. Ludvigsen et al. · Optics Express · 2004 · 416 citations · Full text