Effective Waves for Random Three-dimensional Particulate Materials
(2020)- Abstract
- How do you take a reliable measurement of a material whose microstructure is random? When using wave scattering, the answer is often to take an ensemble average (average over time or space). By ensemble averaging we can calculate the average scattered wave and the effective wavenumber. To date, the literature has focused on calculating the effective wavenumber for a plate filled with particles. One clear unanswered question was how to extend this approach to a material of any geometry and for any source. For example, does the effective wavenumber depend on only the microstructure, or also on the material geometry? In this work, we demonstrate that the effective wavenumbers depend on only microstructure and not the geometry, though beyond... (More)
- How do you take a reliable measurement of a material whose microstructure is random? When using wave scattering, the answer is often to take an ensemble average (average over time or space). By ensemble averaging we can calculate the average scattered wave and the effective wavenumber. To date, the literature has focused on calculating the effective wavenumber for a plate filled with particles. One clear unanswered question was how to extend this approach to a material of any geometry and for any source. For example, does the effective wavenumber depend on only the microstructure, or also on the material geometry? In this work, we demonstrate that the effective wavenumbers depend on only microstructure and not the geometry, though beyond the long wavelength limit there are multiple effective wavenumbers. We show how to calculate the average wave scattered from a random particulate material of any shape, and for broad frequency ranges. As an example, we show how to calculate the average wave scattered from a sphere filled with particles. (Less)
- Abstract (Swedish)
- How do you take a reliable measurement of a material whose microstructure is random? When using wave scattering, the answer is often to take an ensemble average (average over time or space). By ensemble averaging we can the calculate the average scattered wave and the effective wavenumber. To date, the literature has focused on calculating the effective wavenumber for a plate filled with particles. One clear unanswered question was how to extend this approach to a material of any geometry and for any source. For example, does the effective wavenumber depend on only the microstructure, or also on the material geometry? In this work, we demonstrate that the effective wavenumbers depend on only microstructure and not the geometry, though... (More)
- How do you take a reliable measurement of a material whose microstructure is random? When using wave scattering, the answer is often to take an ensemble average (average over time or space). By ensemble averaging we can the calculate the average scattered wave and the effective wavenumber. To date, the literature has focused on calculating the effective wavenumber for a plate filled with particles. One clear unanswered question was how to extend this approach to a material of any geometry and for any source. For example, does the effective wavenumber depend on only the microstructure, or also on the material geometry? In this work, we demonstrate that the effective wavenumbers depend on only microstructure and not the geometry, though beyond the long wavelength limit there are multiple effective wavenumbers. We show how to calculate the average wave scattered from a random particulate material of any shape, and for broad frequency ranges. As an example, we show how to calculate the average wave scattered from a sphere filled with particles. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/12173326-934e-4271-90b6-7c2473044b18
- author
- Gower, Artur and Kristensson, Gerhard LU
- organization
- publishing date
- 2020
- type
- Other contribution
- publication status
- published
- subject
- keywords
- Ensemble averaging, Multiple scattering, Particulate materials, Wave scattering
- pages
- 30 pages
- publisher
- arXiv.org
- language
- English
- LU publication?
- yes
- additional info
- arXiv:2010.00934
- id
- 12173326-934e-4271-90b6-7c2473044b18
- alternative location
- https://arxiv.org/pdf/2010.00934v1.pdf
- date added to LUP
- 2020-10-08 11:30:49
- date last changed
- 2021-09-24 12:06:06
@misc{12173326-934e-4271-90b6-7c2473044b18,
abstract = {{How do you take a reliable measurement of a material whose microstructure is random? When using wave scattering, the answer is often to take an ensemble average (average over time or space). By ensemble averaging we can calculate the average scattered wave and the effective wavenumber. To date, the literature has focused on calculating the effective wavenumber for a plate filled with particles. One clear unanswered question was how to extend this approach to a material of any geometry and for any source. For example, does the effective wavenumber depend on only the microstructure, or also on the material geometry? In this work, we demonstrate that the effective wavenumbers depend on only microstructure and not the geometry, though beyond the long wavelength limit there are multiple effective wavenumbers. We show how to calculate the average wave scattered from a random particulate material of any shape, and for broad frequency ranges. As an example, we show how to calculate the average wave scattered from a sphere filled with particles.}},
author = {{Gower, Artur and Kristensson, Gerhard}},
keywords = {{Ensemble averaging; Multiple scattering; Particulate materials; Wave scattering}},
language = {{eng}},
publisher = {{arXiv.org}},
title = {{Effective Waves for Random Three-dimensional Particulate Materials}},
url = {{https://arxiv.org/pdf/2010.00934v1.pdf}},
year = {{2020}},
}