NDLI: Backscatter 2-<formula formulatype=inline><tex Notation=TeX>$muhbox{m}$</tex></formula> Lidar Validation for Atmospheric <formula formulatype=inline><tex Notation=TeX>$hbox{CO}_{2}$</tex></formula> Differential Absorption Lidar Applications

Content Provider	IEEE Xplore Digital Library
Author	Refaat, T.F. Ismail, S. Koch, G.J. Rubio, M. Mack, T.L. Notari, A. Collins, J.E. Lewis, J. De Young, R. Yonghoon Choi Abedin, M.N. Singh, U.N.
Copyright Year	1980
Abstract	A 2-μm 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-μm atmospheric backscatter profiles were compared to profiles obtained at 1 and 0.5 μm 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-μm 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-μm 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.
Sponsorship	IEEE Geoscience and Remote Sensing Society IEEE URSI
Starting Page	572
Ending Page	580
Page Count	9
File Size	1204595
File Format	PDF
ISSN	01962892
Volume Number	49
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Laser radar Detectors Measurement by laser beam Semiconductor lasers Noise Atmospheric waves Atmospheric measurements remote sensing Backscattering carbon dioxide infrared lidar
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Electrical and Electronic Engineering

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