Photonics Engineering Group, University of Cantabria, Avda. de los Castros S/N, 39005 Santander, Spain; E-Mails:
Sensors (Basel). 2009;9(8):6261-72. doi: 10.3390/s90806261. Epub 2009 Aug 10.
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.
在这项工作中，使用全光纤光学传感器在近红外（NIR）波长区域的 2ν(3) 和 ν(2) + 2ν(3) 吸收带进行甲烷检测。由于其紧凑性、在光学系统中的良好集成性以及与气体进行长相互作用长度的可行性，空心芯光子带隙光纤（HC-PBF）被用作气体池。甲烷的 2ν(3) 带的传感被证明可以实现比 ν(2) + 2ν(3) 带的检测限好一个数量级。最后，证明 HC-PBF 的填充时间取决于光纤长度和几何形状。
