Wave optics simulation of atmospheric turbulence and reflective speckle effects in CO2 differential absorption lidar (DIAL)

Douglas H. Nelson; Roger R. Petrin; Edward P. MacKerrow; Mark J. Schmitt; Charles Robert Quick Jr.; Andrew Zardecki; William M. Porch; Michael C. Whitehead; Donald L. Walters

doi:10.1117/12.323933

8 September 1998 Wave optics simulation of atmospheric turbulence and reflective speckle effects in CO₂ differential absorption lidar (DIAL)

Douglas H. Nelson, Roger R. Petrin, Edward P. MacKerrow, Mark J. Schmitt, Charles Robert Quick Jr., Andrew Zardecki, William M. Porch, Michael C. Whitehead, Donald L. Walters

Author Affiliations +

Proceedings Volume 3381, Airborne Laser Advanced Technology; (1998) https://doi.org/10.1117/12.323933
Event: Aerospace/Defense Sensing and Controls, 1998, Orlando, FL, United States

Abstract

The measurement sensitivity of CO₂ differential absorption LIDAR (DIAL) can be affected by a number of different processes. We will address the interaction of two of these processes: effects due to beam propagation through atmospheric turbulence and effects due to reflective speckle. Atmospheric turbulence affects the beam distribution of energy and phase on target. These effects include beam spreading, beam wander and scintillation which can result in increased shot-to-shot signal noise. In addition, reflective speckle alone has a major impact on the sensitivity of CO₂ DIAL. The interaction of atmospheric turbulence and reflective speckle is of great importance in the performance of a DIAL system. A Huygens-Fresnel wave optics propagation code has previously been developed at the Naval Postgraduate School that models the effects of atmospheric turbulence as propagation through a series of phase screens with appropriate atmospheric statistical characteristics. This code has been modified to include the effects of reflective speckle. The performance of this modified code with respect to the combined effects of atmospheric turbulence and reflective speckle is examined. Results are compared with a combination of experimental data and analytical models.

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Douglas H. Nelson, Roger R. Petrin, Edward P. MacKerrow, Mark J. Schmitt, Charles Robert Quick Jr., Andrew Zardecki, William M. Porch, Michael C. Whitehead, and Donald L. Walters "Wave optics simulation of atmospheric turbulence and reflective speckle effects in CO₂ differential absorption lidar (DIAL)", Proc. SPIE 3381, Airborne Laser Advanced Technology, (8 September 1998); https://doi.org/10.1117/12.323933

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