Vol. 48, Issue 4, pp. 687-695

Vol. 48 Issue 4 pp. 687-695

Quartz enhanced photoacoustic spectroscopy based on an external cavity quantum cascade laser

Linguang Xu, Sheng Zhou, Tianbo He, Jingsong Li

Keywords

external cavity quantum cascade laser (ECQCL), quartz enhanced photoacoustic spectroscopy (QEPAS), volatile organic compound (VOC), ethanol

Abstract

Mid-infrared laser spectroscopy is a powerful analytical tool for trace gases detection. In this study, a spectroscopic system based on an external cavity quantum cascade laser (ECQCL) and quartz enhanced photoacoustic spectroscopy (QEPAS) was developed for volatile organic compounds (VOCs) measurements. Primary laboratory test on ethanol spectroscopy was investigated and compared with traditional direct absorption spectroscopy (DAS). Experimental results show that the proposed QEPAS is more sensitive than the conventional DAS method. In addition, the significant linear dependence of photoacoustic signal on sample pressures and laser operating parameters was observed.

Vol. 48
Issue 4
Article No: 13
pp. 687-695

0.34 MB
OPTICA APPLICATA - a quarterly of the Wrocław University of Science and Technology, Faculty of Fundamental Problems of Technology