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Applied Optics

Applied Optics


  • Vol. 35, Iss. 36 — Dec. 20, 1996
  • pp: 7151–7164

Multiple scattering from Chebyshev particles: Monte Carlo simulations for backscattering in lidar geometry

A. Mannoni, C. Flesia, P. Bruscaglioni, and A. Ismaelli  »View Author Affiliations

Applied Optics, Vol. 35, Issue 36, pp. 7151-7164 (1996)

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Lidar measurements are often interpreted on the basis of two fundamental assumptions: absence of multiple scattering and sphericity of the particles that make up the diffusing medium. There are situations in which neither holds true. We focus our interest on multiply-scattered returns from homogeneous layers of monodisperse, randomly oriented, axisymmetric nonspherical particles. T2 Chebyshev particles have been chosen and their single-scattering properties have been reviewed. A Monte Carlo procedure has been employed to calculate the backscattered signal for several fields of view. Comparisons with the case of scattering from equivalent (equal-volume) spheres have been carried out (narrow polydispersions have been used to smooth the phase functions’ oscillations). Our numerical effort highlights a considerable variability in the intensity of the multiply-scattered signal, which is a consequence of the strong dependence of the backscattering cross section on deformation of the particles. Even more striking effects have been noted for depolarization; peculiar behavior was observed at moderate optical depths when particles characterized by a large backscattering depolarization ratio were employed in our simulations. The sensitivity of depolarization to even small departures from sphericity, in spite of random orientation of the particles, has been confirmed. The results obtained with the Monte Carlo codes have been successfully checked with an analytical formula for double scattering.

© 1996 Optical Society of America

Original Manuscript: July 26, 1995
Revised Manuscript: April 30, 1996
Published: December 20, 1996

A. Mannoni, C. Flesia, P. Bruscaglioni, and A. Ismaelli, "Multiple scattering from Chebyshev particles: Monte Carlo simulations for backscattering in lidar geometry," Appl. Opt. 35, 7151-7164 (1996)

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