Discrete-angle radiative transfer in a multifractal medium

Anthony B. Davis; Shaun Lovejoy; Daniel Schertzer

doi:10.1117/12.49612

11 November 1991 Discrete-angle radiative transfer in a multifractal medium

Anthony B. Davis, Shaun Lovejoy, Daniel Schertzer

Author Affiliations +

Proceedings Volume 1558, Wave Propagation and Scattering in Varied Media II; (1991) https://doi.org/10.1117/12.49612
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

A simplified (discrete angle, DA) radiative transfer theory is presented as a computationally and conceptually advantageous alternative to standard (continuous angle) theory. After briefly reviewing the basic ideas of random fractal geometry and multifractal cascade theory, we present some of our recent two-dimensional DA numerical simulations of transfer through a specific log-normal multifractal cloud model where the radiation fields are spatially resolved on a 1024 x 1024 point grid. Using this data base, we demonstrate (1) how in inhomogeneous transfer problems horizontal fluxes work in quite subtle ways to create dramatic overall differences with homogeneous predictions for the same amount of scattering material, and (2) how strongly multiple scattering can smooth extremely singular density fields. Furthermore, both of these effects are enhanced by increasing optical thickness which can be viewed as a measure of the strength of the nonlinear coupling between the density and radiance fields. Finally, we discuss some basic inequalities that arise between the various ways of computing overall (spatially averaged) response to illumination.

Citation Download Citation

Anthony B. Davis, Shaun Lovejoy, and Daniel Schertzer "Discrete-angle radiative transfer in a multifractal medium", Proc. SPIE 1558, Wave Propagation and Scattering in Varied Media II, (11 November 1991); https://doi.org/10.1117/12.49612

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE