Abstract
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.
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