Applications of quantum cascade lasers for sensitive trace gas measurements of CO, CH4, N2O and HCHO |
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| Authors: | CL Schiller H Bozem C Gurk U Parchatka R Königstedt GW Harris J Lelieveld H Fischer |
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| Institution: | (1) Abteilung Luftchemie, Max-Planck Institut für Chemie, P.O. Box 3060, 55020 Mainz, Germany;(2) Centre for Atmospheric Chemistry, York University, 4700 Keele Street, Toronto, Ontario, M3J 1P3, Canada |
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| Abstract: | We describe here a sensitive quantum cascade laser absorption spectrometer (QCLAS) employed for aircraft based measurements
during the GABRIEL 2005 and HOOVER 2006 and 2007 campaigns. This 3-channel instrument measures CO, HCHO, CH4 and N2O using a 64-m path double corner cube White cell. Performance of the instrument was examined for the four species and precisions
for CO, N2O and CH4 were measured in the field to be 0.5, 0.5 and 0.7% respectively (2σ). The 1σ detection limit for HCHO was ∼500 pptv for a
2 s average, while signal averaging of the HCHO over a 2 min time interval resulted in a 150 pptv detection limit with a duty
cycle of 60%.
PACS 82.80.Gk; 07.88.+y; 42.62.-b; 92.60.H- |
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