Abstract
Previously [J. Acoust. Soc. Am. Suppl. 1, 68, S1 (1980)], the authors compared the exact wedge diffraction time-separable impulse solution [M. A. Biot and I. Tolstoy, J. Acoust. Soc. Am. 29, 381–391 (1957); A.D. Pierce, Acoustics, 489–490 (1981)] with a related solution involving the Helmholtz-Kirchhoff approximation [A. W. Trorey, Geophys. 35, 762–784 (1970)]. A comparison is provided here between scattered intensity values measured in a water-tank experiment [G. A. Sandness, Ph.D. thesis, Univ. of Wisconsin, Madison (1973)] and values predicted using both the Helmholtz-Kirchhoff solution and the frequency transform of an asymptotic approximation to the exact solution. In the experiment, a wave generator created a surface with a spatial wavelength of 8.8 cm and a peak-to-peak amplitude of 0.61 cm. A 205.6-kHz source (kσ = 1.9) and a receiver were located 50 cm below the surface. In the prediction using the transform, the surface was approximated by joining finite wedges edge to edge. Field values were then obtained by superposition. Agreement between these values and the experimental values is good in general. Agreement between the experimental values and those predicted using the Helmholtz-Kirchhoff solution is best near the specular direction. [Work supported by NORDA.]
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