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Validation of first-order diffraction theory for the traveltimes and amplitudes of propagating wavesJocker, J. (author), Spetzler, J. (author), Smeulders, D.M.J. (author), Trampert, J. (author)Ultrasonic measurements of acoustic wavefields scattered by single spheres placed in a homogenous background medium (water) are presented. The dimensions of the spheres are comparable to the wavelength and the wavelength and represent both positive (rubber) and negative (teflon) velocity anomalies with respect to the background medium. The...journal article 2006