This chapter provides an overview of 3D Born and Kirchhoff inverse scattering methods, which are modified for a cylindrical specimen that includes 3D flaws. The measurement area in the modified methods is restricted in the plane perpendicular to the axis of the cylindrical specimen. The incident wave with the Gaussian amplitude profile is introduced in the numerical analysis, to examine the effect of the incident beam radius. The modified methods are applied to the aluminum specimen with a cylindrical flaw and the performance of the modified methods is confirmed by the experimental measurement. The reconstructed images showed that the inversion with the wide incident beam gave the representative size of the flaw and the narrow beam gave the cross-sectional image of the flaw. It is preferable to select the radius of the ultrasonic beam adequately according to the purpose and accuracy of the inspection.
|Title of host publication||Inverse Problems in Engineering Mechanics IV|
|Number of pages||8|
|Publication status||Published - 2003|
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