Physics – Optics
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.2956...30b&link_type=abstract
Proc. SPIE Vol. 2956, p. 30-38, Optics in Atmospheric Propagation, Adaptive Systems, and Lidar Techniques for Remote Sensing, Ad
Physics
Optics
Scientific paper
Differential Absorption Lidar measurements from a satellite platform are more complex and can yield more information than terrestrial DIAL measurements because of the significant Doppler shift associated with high satellite velocity relative to the atmosphere. This Doppler effect can be exploited as an extra degree of freedom in matching laser lines to molecular absorption lines or as a mechanism enabling measurement of species density versus altitude. The molecular absorption cross section depends upon altitude (pressure broadening) and upon the range rate of change to the satellite (Doppler). Thus measurements at many different angles during a satellite pass over a ground point will generate data that can be inverted to solve for molecular species density versus altitude. A demonstration experiment using a CO(subscript 2) laser on the ground and corner reflectors on the NASA Clark satellite is described. The characteristics of a satellite-based Doppler enhanced DIAL sensor are presented.
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