Abstract
A differential absorption lidar has been built to measure CO2 concentration in the atmosphere. The transmitter is a pulsed single-frequency Ho:Tm:YLF laser at a 2.05-μm wavelength. A coherent heterodyne receiver was used to achieve sensitive detection, with the additional capability for wind profiling by a Doppler technique. Signal processing includes an algorithm for power measurement of a heterodyne signal. Results show a precision of the CO2 concentration measurement of 1%–2% 1σ standard deviation over column lengths ranging from 1.2 to 2.8 km by an average of 1000 pulse pairs. A preliminary assessment of instrument sensitivity was made with an 8-h-long measurement set, along with correlative measurements with an in situ sensor, to determine that a CO2 trend could be detected.
© 2004 Optical Society of America
Full Article | PDF ArticleMore Like This
Grady J. Koch, Jeffrey Y. Beyon, Fabien Gibert, Bruce W. Barnes, Syed Ismail, Mulugeta Petros, Paul J. Petzar, Jirong Yu, Edward A. Modlin, Kenneth J. Davis, and Upendra N. Singh
Appl. Opt. 47(7) 944-956 (2008)
Fabien Gibert, Pierre H. Flamant, Didier Bruneau, and Claude Loth
Appl. Opt. 45(18) 4448-4458 (2006)
Shoken Ishii, Kohei Mizutani, Hirotake Fukuoka, Takayoshi Ishikawa, Baron Philippe, Hironari Iwai, Tetsuo Aoki, Toshikazu Itabe, Atsushi Sato, and Kazuhiro Asai
Appl. Opt. 49(10) 1809-1817 (2010)