Diffuse elastic waves in a nearly axisymmetric body: Energy distribution, transport and dynamical localization
| Autor: | John Y. Yoritomo, Richard L. Weaver, J. Patrick Coleman |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Anderson localization Backscatter Scattering Rotational symmetry General Physics and Astronomy 01 natural sciences Computational physics Wavelength Quantum mechanics 0103 physical sciences Relaxation (physics) General Materials Science Symmetry breaking Physical and Theoretical Chemistry 010306 general physics 010301 acoustics Equipartition theorem |
| Zdroj: | The European Physical Journal Special Topics. 226:1371-1408 |
| ISSN: | 1951-6401 1951-6355 |
| DOI: | 10.1140/epjst/e2016-60186-7 |
| Popis: | We report measurements and theory on the distribution and evolution of diffuse ultrasonic waves in elastic bodies with weakly broken axisymmetry. Aluminum cylinders with dimensions large compared to wavelength were excited by transient point sources at the center of one of the circular faces. The resulting power spectral density PSD was then examined as a function of time and frequency and position on that face. It was found that the PSD showed a marked concentration at the center at early times, a concentration that subsequently slowly diminished towards a state of uniformity across the face, over times long compared to ultrasonic transit time across the sample. The evolution is attributed to scattering by symmetry breaking heterogeneities. Relaxation did not proceed all the way to uniformity and equipartition, behavior shown to be consistent with Enhanced Backscatter and Dynamical Anderson Localization. |
| Databáze: | OpenAIRE |
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