Proceedings PaperUltrasonic Flaw Detection And Sizing For Quantitative Nondestructive Evaluation
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The frequency-domain Neumann-Born approximation is used to study the determination of the radii and material parameters of spherical flaws. Bandwidth limiting and the effects of noise are studied. An eikonal approximation by Rose and DeFacio was also used. Only the reconstruction using a single scattering angle is addressed. Backscattered amplitudes (θ = 180°) and near forward scattering amplitudes at θ = 30° were not as successful as θ = 60° data. The radii were determined better than material parameters and in the case of a single backscatter with 5% noise and fairly strong scattering no radius was determined.