Optimization of complex shape part inspections with phased arrays

The non-destructive testing of complex shape parts is usually performed in immersion. In state of the art phased array equipments an image consists of a set of scan lines where dynamic depth focusing is performed in reception. To achieve the highest resolution and sensitivity, the scan lines should coincide with the path of maximum acoustic field intensity of the emitted beam. In complex part inspections, it is common that the path defined by the maximum field does not coincide with the scan lines. In order to increase the image resolution and sensitivity, this paper presents a correction algorithm to determine the locus of the foci that coincide with the maximum field intensity of the emitted beam. The proposed method was verified by comparing the images obtained with the classical approach and with that obtained by using the correction algorithm. The image comparison shows that the proposed method improves the image sensitivity and resolution.