Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Scattering of electromagnetic waves by composite spherical particles: experiment and effective medium approximations

Not Accessible

Your library or personal account may give you access

Abstract

We have measured the differential scattering cross sections (phase functions I22) and the normalized extinction and scattering cross sections (efficiences) of composite spherical particles. The size parameter x = 2πr/λ was around 2π. Composite spheres consisted of nonabsorbing matrix containing a small amount (1.6 and 2.7% by volume) of highly absorbing inclusions. Such composite particles may represent a realistic model of fog or cloud droplets containing small amounts of carbon or a composite atmospheric aerosol particle. We have compared measured data with those calculated using seven different effective medium approximations. We have found that the approximations of Bruggeman and Maxwell Garnett, the generalization of dynamic effective medium approximation derived by Chylek and Srivastava, and the experimental waveguide method of determination of the effective refractive index lead to an acceptable agreement between calculated and measured values. The reduced χ2 values for these approximations ranged between 0.6 and 2.0. The remaining three approximations (volume averages of refractive indices or dielectric constants and the Maxwell Garnett relation with matrix and inclusion materials interchanged) lead to reduced χ2 values between 4.0 and 12.0 demonstrating a large disagreement between calculated and measured scattering characteristics.

© 1988 Optical Society of America

Full Article  |  PDF Article
More Like This
Effective medium theories for irregular fluffy structures: aggregation of small particles

Nikolai V. Voshchinnikov, Gorden Videen, and Thomas Henning
Appl. Opt. 46(19) 4065-4072 (2007)

Scattering functions of tropospheric aerosols: the effects of nonspherical particles

Peter Koepke and Michael Hess
Appl. Opt. 27(12) 2422-2430 (1988)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (8)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (7)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (12)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved