Abstract
The Keller geometrical theory of diffraction “GTD” [Keller, Symposium on Microwave Optics, McGill Univ. (1953)] has proven over the past 20 years to be an extremely powerful addition to high-frequency acoustical and optical theories. One important law of GTD is the law of edge diffraction; its import stems from the fact that edge diffraction is second in importance only to geometrical acoustics (the classical ray theory) in forming the scattered field from obstacles. The law of edge diffraction was experimentally demonstrated in one previous case [Senior and Uslenghi, Proc. IEEE 60, No. 11, 1448 (1972)]. We have developed a different method for observing edge diffraction which permits motion visualization of the complete three-dimensional diffraction cone produced by scattering from a variety of wedges. These results have been correlated with theory and their degree of correlation is shown.
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