title: Coda-wave interferometry in finite solids: recovery of P-to-S conversion rates in an elastodynamic billiard.
abstract: We study the temperature dependence of diffuse reverberant ultrasound in elastic bodies. Transient wave forms are found to undergo an almost pure dilation of 0.0277% per degree, related to the temperature dependence of wave speeds. The wave forms also suffer a distortion that, we argue, depends on the rate of conversion between the dilatational (P) and shear (S) waves. Distortion is found to scale in a manner consistent with theoretical arguments but also appears to be a function of the degree of ray chaos in the body, indicating that the mixing rates are slower in more regular bodies.
authors.affiliation: Theoretical and Applied Mechanics, University of Illinois, 104 South Wright Street, Urbana, Illinois 61801, USA.
authors.forename: Oleg I
authors.initials: OI
authors.lastname: Lobkis
authors.forename: Richard L
authors.initials: RL
authors.lastname: Weaver