We describe the four-laser airborne infrared (FLAIR) instrument, a tunable diode laser absorption spectrometer designed for simultaneous high-sensitivity in situ measurements of four atmospheric trace gases in the troposphere. The FLAIR spectrometer was employed during the large-scale airborne research campaign on tropospheric ozone (TROPOZ II) in 1991 and was used to measure CO, H2 O2, HCHO, and NO2 in the free troposphere where detection limits below 100 parts in 1012 by volume were achieved.
© 1996 Optical Society of America
J. Roths, T. Zenker, U. Parchatka, F. G. Wienhold, and G. W. Harris, "Four-laser airborne infrared spectrometer for atmospheric trace gas measurements," Appl. Opt. 35, 7075-7084 (1996)