Gayraud Nicolas, Kornaszewski Ukasz W, Stone James M, Knight Jonathan C, Reid Derryck T, Hand Duncan P, MacPherson William N
Applied Optics and Photonics Group, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK.
Appl Opt. 2008 Mar 20;47(9):1269-77. doi: 10.1364/ao.47.001269.
We demonstrate methane sensing based on Fourier transform infrared spectroscopy using a hollow-core photonic bandgap fiber guiding in the mid-infrared and idler pulses from a femtosecond optical parametric oscillator. Transmission measurements are presented for several fibers, and sensing is demonstrated using a fiber whose bandgap overlaps the methane fundamental absorption lines. The gas filling process of the air core is described, and qualitative methane concentrations measurements to 1000 ppm (parts in 10(6)) are reported. Operation down to 50 ppm based on our current experiment is predicted.
我们展示了基于傅里叶变换红外光谱的甲烷传感技术，该技术使用了一种中空光子带隙光纤，这种光纤在中红外波段引导飞秒光参量振荡器产生的闲频脉冲。给出了几种光纤的传输测量结果，并使用带隙与甲烷基频吸收线重叠的光纤进行了传感演示。描述了空气芯的气体填充过程，并报告了对1000 ppm（百万分之几）的甲烷浓度进行的定性测量。根据我们目前的实验预测，该技术可低至50 ppm的甲烷浓度下运行。
