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Proceedings Paper

Optimizing lidar dynamic range by engineering the crossover region
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Paper Abstract

Accommodating the large dynamic range of lidar signals is always a challenge for optical engineers. Signals from low altitudes are much larger than signals from high altitudes because of their inverse-range-squared behavior, as well as atmospheric absorption and scattering. It is well known that the onset of received lidar signals with range can be controlled by adjusting the crossover of the laser beam into the receiver field of view. However, a careful analysis has shown that, in many lidar applications much of the system's dynamic range can be used up before the range where the crossover is complete. In addition, the analysis shows that defocus is the primary contributor to the geometrical overlap function in determining the range dependence of the signal, and that understanding defocus is necessary for the optical designer to optimize system performance. Examples are given to illustrate the improvements in dynamic range that can be achieved by optimizing the focus of a lidar receiver.

Paper Details

Date Published: 29 July 2002
PDF: 10 pages
Proc. SPIE 4723, Laser Radar Technology and Applications VII, (29 July 2002); doi: 10.1117/12.476403
Show Author Affiliations
David W. Roberts, Georgia Institute of Technology (United States)
Gary G. Gimmestad, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 4723:
Laser Radar Technology and Applications VII
Gary W. Kamerman, Editor(s)

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