Radiative transfer of ultrasound

Radiative transfer theory is used to model the multiple scattering of diffuse ultrasonic waves in two types of random media. The first type is an isotropic, homogeneous medium containing randomly oriented, randomly located scatterers. The scatterers are assumed to be uncorrelated. This assumption allows an equation of transfer to be written which governs the multiply scattered intensities. This ultrasonic radiative transfer equation (URTE) contains single scattering and propagation parameters that are calculated using the elastic wave equation. Polarization effects are included through the introduction of an elastodynamic Stokes vector which contains a longitudinal Stokes parameter and four shear Stokes parameters similar to the four Stokes parameters used in optical radiative transfer theory. The theory is applied to a statistically homogeneous isotropic half space containing randomly distributed spherical voids illuminated by a harmonic plane wave.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Mechanical Science

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Turner, Joseph Alan

Contributors dc:contributor

• Weaver, Richard L.

• Applied Mechanics
• Engineering, Materials Science
• Physics, Acoustics

Statement dc:rights

• Copyright 1994 Turner, Joseph Alan

Language dc:language

eng

Identifier

AAI9512578
(UMI)AAI9512578

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/20186