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

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

http://dx.doi.org/10.1364/AO.35.007151

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### Abstract

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.
*T*_{2} 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

**History**

Original Manuscript: July 26, 1995

Revised Manuscript: April 30, 1996

Published: December 20, 1996

**Citation**

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)

http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-35-36-7151

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