Jahjah Mohammad, Ren Wei, Stefański Przemysław, Lewicki Rafał, Zhang Jiawei, Jiang Wenzhe, Tarka Jan, Tittel Frank K
Rice University, Department of Electrical and Computer Engineering, 6100 Main Street, Houston, TX 77005, USA.
Analyst. 2014 May 7;139(9):2065-9. doi: 10.1039/c3an01452e.
A methane (CH4) and nitrous oxide (N2O) sensor based on a sensitive, selective and well established technique of quartz enhanced photoacoustic spectroscopy (QEPAS) was developed for environmental and biomedical measurements. A thermoelectrically cooled (TEC) distributed feedback quantum cascade laser (DFB-QCL), capable of continuous wave (CW) mode hop free emission in the 7.83 μm wavelength range, was used as an excitation source. For the targeted CH4 and N2O absorption lines located at 1275.04 cm(-1) and 1275.49 cm(-1) detection limits (1σ) of 13 ppbv and 6 ppbv were achieved with a 1 second data acquisition time, respectively. Environmental data of CH4 and N2O mixing ratios acquired using the QEPAS sensor system are also reported.
基于灵敏、选择性好且成熟的石英增强光声光谱技术（QEPAS），开发了一种用于环境和生物医学测量的甲烷（CH4）和一氧化二氮（N2O）传感器。采用了一种热电冷却（TEC）分布式反馈量子级联激光器（DFB-QCL），其能够在7.83μm波长范围内进行无跳模连续波（CW）发射，用作激发源。对于位于1275.04 cm(-1)和1275.49 cm(-1)的目标CH4和N2O吸收线，在1秒数据采集时间下，检测限（1σ）分别达到13 ppbv和6 ppbv。还报告了使用QEPAS传感器系统获取的CH4和N2O混合比的环境数据。
