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Sound emitted by a circular loudspeaker can be treated as equivalent to a plane wave diffracted by a circular aperture in a rigid, sound absorbing screen. Axial symmetry leads one to expect constructive interference along the symmetry axis in the near field (the Poisson-Arago spot). An energy flux streamline model was developed to help visualize this and other features of the nearsound field. The model is used to draw out similarities and differences between energy flux streamlines and acoustic rays, particularly in the transition to the far field.


The right, six or more months after publication by the ASA, to post copies of the article as published on the author(s) institutional internet web sites or on governmental web sites, to whatever extent is required by the author(s) institution or by whoever funded the research reported in the paper. Article obtained from the Proceedings of Meetings on Acoustic.


International Congress on Acoustics (ICA), Acoustical Society of America (ASA), and Canadian Acoustical Association (CAA) Meeting


Montreal, Canada

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