Backscatter 2-μm Lidar Validation for Atmospheric CO2 Differential Absorption Lidar Applications

A 2- mu m backscatter lidar system has been developed by utilizing tunable pulsed laser and infrared phototransistor for the transmitter and the receiver, respectively. To validate the system, the 2- mu m atmospheric backscatter profiles were compared to profiles obtained at 1 and 0.5 mu m using ava...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2011, Vol.49 (1), p.572-580
Main Authors: REFAAT, Tamer F, ISMAIL, Syed, ABEDIN, M. Nurul, SINGH, Upendra N, KOCH, Grady J, RUBIO, Manuel, MACK, Terry L, NOTARI, Anthony, COLLINS, James E, LEWIS, Jasper, DE YOUNG, Russell, CHOI, Yonghoon
Format: Article
Language:English
Subjects:
Applied geophysics
Atmospherics
Backscattering
Carbon monoxide
Dials
Earth sciences
Earth, ocean, space
Exact sciences and technology
Internal geophysics
Lidar
Methodology
Temporal logic
Wavelengths
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Summary:A 2- mu m backscatter lidar system has been developed by utilizing tunable pulsed laser and infrared phototransistor for the transmitter and the receiver, respectively. To validate the system, the 2- mu m atmospheric backscatter profiles were compared to profiles obtained at 1 and 0.5 mu m using avalanche photodiode and photomultiplier tube, respectively. Consequently, a methodology is proposed to compare the performance of different lidar systems operating at different wavelengths through various detection technologies. The methodology is based on extracting the system equivalent detectivity and comparing it to that of the detectors, as well as the ideal background detectivity. Besides, the 2- mu m system capability for atmospheric CO2 temporal profiling using the differential absorption lidar (DIAL) technique was demonstrated. This was achieved by tuning the laser at slightly different wavelengths around the CO2 R22 absorption line in the 2.05- mu m band. CO2 temporal profiles were also compared to in situ measurements. Preliminary results indicated average mixing ratios close to 390 ppm in the atmospheric boundary layer with 3.0% precision. The development of this system is an initial step for developing a high-resolution, high-precision direct-detection atmospheric CO2 DIAL system. A successful development of this system would be a valuable tool in obtaining and validating global atmospheric CO2 measurements.
ISSN:0196-2892
1558-0644
DOI:10.1109/TGRS.2010.2055874