Walaszek, Henri; Centre Technique des Industries Mecaniques; France
Brzuchacz, S.; CETIM; France
Cailly, W.; CETIM; France
Walaszek, H.; CETIM; France
Session: Imaging - UT 1
Time: 16:20 - 16:40
Non-destructive testing techniques now routinely incorporate digital signal acquisition techniques, and which make it possible to represent the response of the objects in the form of an image, in particular in ultrasonic ultrasound. In the case of ultrasound, this image is a reflection of the amplitudes or time of flight of the waves in the material. Ultrasonic imaging thus allows the objects to be represented in the form of a projection parallel or perpendicular to the surface of the material (the B-scan-slice presentation, for example, is also used in medicine). However, these representations are highly dependent on the orientation of the defects in the material, and do enable the display of the response of the inspected component in 3 dimensions. Tests carried out to date in various laboratories as well as CETIM show that it is now possible, through ultrasound acquisitions realized in transmission from different angles, to realize, as in X-ray tomography, reconstructions in two or three dimensions of objects, with a reduced sensitivity to the orientation of the defects, with a gain of signal-to-noise ratio.
The communication will consist in describing the problem of the ultrasound tomographic control by reconstruction, and to position this method in relation to the existing processing methods (Full Matrix capture, FTP). Analogies with the x-rays, and the particularities of the ultrasound reconstruction, will be explained, highlighting the advantages and limitations of each method. The results published by the different laboratories active on the subject will also be presented. Finally, the major potential applications of reconstruction tomography will be discussed, as well as the latches to be lifted in order to allow industrialization of this process, while considering the three dimensional ultrasonic imagery in the context of the development of digital and computer technologies.