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

Sensors

Ana M. Cubillas²  Jose M. Lazaro²  Olga M. Conde²  Marco N. Petrovich¹ 

[1] Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, UK; E-Mail:;Photonics Engineering Group, University of Cantabria, Avda. de los Castros S/N, 39005 Santander, Spain; E-Mails:

关键词: gas detectors;    methane;    fibre optic sensors;    photonic crystal fibres;    hollow-core photonic bandgap fibres;    absorption spectroscopy;   

DOI  :  10.3390/s90806261

来源: mdpi

【 摘 要 】

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. 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 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.

【 授权许可】

CC BY   
© 2009 by the authors; licensee MDPI, Basel, Switzerland