Determination of the Scattering Coefficient of Random Rough Diffusing Surfaces for Room Acoustics Applications
In room acoustics, the scattering coefficient of a diffusing surface is defined as the ratio of the non-specularly reflected power to the total power reflected by the surface. The value of this coefficient (and its dependence on frequency) is essential for the users of any modern room acoustics calculation tool. Some techniques have been proposed to measure this value, under well-defined sound field conditions. The scattering coefficient is here rather derived from scattering theories. In particular, random rough surfaces are analysed using Kirchhoff Approximation methods, which lead to theoretical expressions illustrating the dependence of the scattering coefficient on frequency, angle of incidence and geometrical roughness profile of the surface. It is shown that these theoretical expressions are consistent with the results that could be expected from the determination of the whole directional distribution of the scattered pressure.
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Document Type: Research Article
Publication date: July 1, 2001
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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