Application of a modified SAFT-algorithm on synthetic B-scans of coarse grained materials

In non-destructive-testing the Synthetic Aperture Focussing Technique is frequently used [Langenberg, 1987] to get an image of the investigated specimen from ultrasonic data. Though the algorithm is applied to any kind of material, it's theory is only valid in the case of homogeneous media. That is why the results in coarse grained materials, for example in concrete, are difficult to interpret or have to be analysed with special techniques [Köhler et al., 1997]. It is shown, that the algorithm can be modified in a simple way to get better results for imaging purposes.