Lidar depolarization asymmetry measurements and its relation with the optical depth

Nathalie Roy; Gilles Roy; Luc R. Bissonnette; Jean-Robert Simard

doi:10.1117/12.617469

17 March 2005 Lidar depolarization asymmetry measurements and its relation with the optical depth

Nathalie Roy, Gilles Roy, Luc R. Bissonnette, Jean-Robert Simard

Proceedings Volume 5829, 13th International Workshop on Lidar Multiple Scattering Experiments; (2005) https://doi.org/10.1117/12.617469
Event: 13th International Workshop on Lidar Multiple Scattering Experiments, 2004, St. Petersburg, Russian Federation

Abstract

We measure the cross-polarized backscattered light from a linearly polarized laser beam penetrating a cloud made of spherical particles with a gated intensified CCD camera. In accordance with previously published results, we observe a clear azimuthal pattern in the recorded images. We show that the pattern originates from second order scattering, and that higher-order scattering causes blurring that increases with optical depth. We also find that the contrast of the symmetrical features can be related to the measure of the optical depth. Moreover, by identifying and subtracting the blurring contributions, the resulting pattern provides a "pure" second-order scattering measurement that can be used for the retrieval of droplet size. We apply this technique on a stratus cloud located at 1400 m. The extinction values retrieved on the basis of the laboratory quantification of the blurring of the multiple scattering secondary polarization patterns measured from the ICCD images are then compared with the profile of the extinction coefficient obtained using Bissonnette's algorithm, which is based on the multiple-field-of-view (MFOV) lidar returns.

Citation Download Citation

Nathalie Roy, Gilles Roy, Luc R. Bissonnette, and Jean-Robert Simard "Lidar depolarization asymmetry measurements and its relation with the optical depth", Proc. SPIE 5829, 13th International Workshop on Lidar Multiple Scattering Experiments, (17 March 2005); https://doi.org/10.1117/12.617469

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