![]() ![]() Like diffraction, scattering results in sound going into locations that would not be predicted by geometrical acoustics. Scattering is the specular reflection of a wave from small segments of a rough surface. ![]() Diffraction cannot be completely simulated by geometrical acoustics, although there are mathematical methods for approximating diffraction effects.Ī related acoustical phenomenon is scattering. Notice that there is no blocking of the wavefronts by the small obstacle. In the figure, the circles represent wavefronts. If the object size is roughly equal to, or is less than, a wavelength, the wave will diffract around the object, as illustrated in Figure 1. If the object is large compared to the wavelength, the reflection will be specular (like light), traveling in a straight line. When a wave strikes an object, part of it is absorbed by the object, and part is reflected off the object. The problem with the “ray” approximation is that wave propagation is not limited to straight lines. Even today, I occasionally revert to the modern version of these old tools (a CAD program) when designing the contour of a reflective ceiling or ceiling “clouds”. A ray is the (assumed) linear path of a particle.įor many years, acoustical analysis was limited to statistical approaches such as Sabine and related RT calculations, and manual ray-tracing (geometrical acoustics), which involved a drawing table, straight edge, protractor and pencil. A wave has no specific position, whereas a particle does. But under certain conditions, we can simplify our analyses by pretending that it moves as particles or rays. By Richard Honeycutt This article will help you understand Acoustical Scattering.Īs we all know, sound propagates as a wave. ![]()
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