Wave optics simulation of atmospheric turbulence and reflective speckle effects in CO2 differential absorption LIDAR (DIAL)
Nelson, Dougles H.
Petrin, Roger R.
MacKerrow, Edward P.
Schmitt, Mark J.
Quick, Charles R.
Porch, William M.
Walters, Donald L.
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The measurement sensitivity of C02 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 C02 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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Huygens-Fresnel wave-optics simulation of atmospheric optical turbulence and reflective speckle in CO2 differential absorption LIDAR (DIAL) Nelson, Douglas H.; Petrin, Roger R.; MacKerrow, Edward P.; Schmitt, Mark J.; Foy, Bernard R.; Koskelo, Aaron C.; McVey, Brian D.; Quick, Charles R.; Porch, William M.; Tiee, Joe J.; Fite, Charles B.; Archuleta, Frank A.; Whitehead, Michael C.; Walters, Donald L. (Los Alamos, New Mexico. Los Alamos National Laboratory, 1999-03);The measurement sensitivity of C02 differential absorption lidar (DIAL) can be affected by a number of different processes. We have previously developed a Huygens-Fresnel wave optics propagation code to simulate the ...
Nelson, Douglas H.; Walters, Donald L.; MacKerrow, Edward P.; Schmitt, Mark J.; Quick, Charles R.; Porch, William M.; Petrin, Roger R. (2000-04);Laser speckle can influence lidar measurements from a diffuse hard target. Atmospheric optical turbulence will also affect the lidar return signal. We present a numerical simulation that models the propagation of a lidar ...
Nelson, Douglas H.; Petrin, Roger R.; Schmitt, Mark J.; Whitehead, Michael C.; Walters, Donald L. (Livermore, California. Lawrence Livermore National Laboratory, 1997-02);Atmospheric turbulence causes several effects on a propagating laser beam We have previously studied the effects of beam spreading and beam wander, and feel we have a good understanding of their impact on CO2 DIAL. ...