Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.a22b..11m&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #A22B-11
Physics
3360 Remote Sensing
Scientific paper
We have developed a KrF Lidar system (248 nm) for remotely determining lower tropospheric ozone concentrations from Raman scattering by atmospheric nitrogen and oxygen molecules. We utilize a non-coaxial technique whereby the up-welled laser beam crosses the field-of-view of a telescope at a specific location in space, known as the interaction region. This technique is referred to as the Selected Overlap Lidar Experiment (SOLEX). The shape of the interaction volume changes as the location of the overlap position changes. The distance from the overlap region to the telescope defines the range. When the range increases, the angle at which the laser beam and the telescope field of view crosses also increases. A subsequent increase in the interaction volume occurs. The temporal shape of the returned pulse is dependent on the size of the interaction volume. Thus, useful information on the interaction volume can be obtained from the pulse shape. We have developed a computer model based on our system that reasonably predicts the temporal pulse shape of our returned signal as a function of range. This model incorporates the divergence of the laser beam, the size of the telescope footprint at the location of interest and the geometry of the non-coaxial system. The model shows that there is a well-defined correspondence between the size of the interaction volume and the temporal shape of the returned signal. We will present the findings of the model and compare these findings with data obtained with the SOLEX system. This work is supported by the Center for the Study of Terrestrial and Extraterrestrial Atmospheres/NASA Grant #NCC5-184.
Joseph Everette
Moore Harold
Thorpe Arthur N.
Venable D. D.
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