Accession Number : ADA135687


Title :   The Optical Spectra of Aerosols.


Descriptive Note : Interim periodic rept. no. 5, Mar-Oct 83,


Corporate Author : MESSINA UNIV (ITALY) IST DI STRUTTURA DELLA MATERIA


Personal Author(s) : Borghese,F


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA135687


Report Date : Oct 1983


Pagination or Media Count : 40


Abstract : A method to calculate the macroscopic optical constants of a low density medium consisting of a cloud of identical nonspherical scatterers is presented. The scatterers in the medium are clusters of dielectric spheres and the electromagnetic field scattered by each of the clusters is obtained as a superposition of multipole fields, as previously proposed by the authors. The transformation properties of the spherical multipoles under rotation allow the orientational-dependent terms in the expression for the forward-scattering amplitude of each of the clusters to be factored out. In this way the sum of the scattering amplitudes of the clusters with different orientations, needed to calculate the optical response of the medium, is greatly facilitated and admits a simple analytic expression in the case of randomly oriented clusters. Results of calculations of the optical constants for a few model media are presented.


Descriptors :   *Computations , *Light scattering , *Aerosols , Low density , Clustering , Spheres , Dielectrics , Optical properties , Visible spectra , Particles , Constants , Transformations


Subject Categories : Numerical Mathematics
      Atomic and Molecular Physics and Spectroscopy
      Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE