QEPAS detector for rapid spectral measurements

• DOI: 10.1007/s00340-010-3975-0
• Publication Date: 2010-03-15T18:33:12Z
• Authors: A. A. Kosterev; P. R. Buerki; L. Dong; M. Reed; T. Day; F. K. Tittel
• Keywords: Freon; Photoacoustic Spectroscopy; Quantum cascade laser

A quartz enhanced photoacoustic spectroscopy sensor designed for fast response was used in combina- tion with a pulsed external cavity quantum cascade laser to rapidly acquire gas absorption data over the 1196- 1281 cm −1 spectral range. The system was used to measure concentrations of water vapor, pentafluoroethane (freon- 125), acetone, and ethanol both individually and in com- bined mixtures. The precision achieved for freon-125 con- centration in a single 1.1 s long spectral scan is 13 ppbv.