The SAUL technique enables the transmission of an incident wave-front parallel to any complex surface. One specimen presenting variable geometries (flat, concave or convex surfaces) can be entirely controlled using a unique probe (such as a matrix array with a flat active aperture). This is achieved by means of an iterative algorithm that does not require the knowledge of the geometrical and acoustical properties of the component undergoing inspection. The real-time adaptive processing is illustrated through measurements obtained with typical aircraft composite structures (e.g., CFRP stringers, stiffeners).
Figure: typical shape for aircraft composite parts
M2M phased-array system and probe using SAUL
The M2M-designed SAUL probe is a flat matrix array. The probe and the M2M parameters are kept identical for the whole inspection of the part. The inspection of the parts can therefore be fully automated. Results are obtained in the form of C-Scans. The resulting C-Scan represents a flatten view of the specimen, including ID, OD and flat zones.
N. Dominguez, G. Ithurralde, ‘Ultra-fast Ultrasonic Inspection for Aeronautical Composites using Paintbrush Acquisitions and Data Processing on GPU’, European Conference on NDT, Moscow, 2010.
A. Maurer, W. Haase, W. De Odorico, ‘Phased Array Application in Industrial Scanning Systems’, ECNDT Proceeding, September 2006.
S. Robert, O. Casula, M. Njiki, O. Roy, ‘Assessment of Real-Time Techniques for Ultrasonic Nondestructive Testing’, Review of Progress in QNDE, in press, 2012.
S. Robert, O. Casula, A. Nadim, ‘Procédé de Commande de Transducteurs d’une Sonde à Ultrasons, Programme d’Ordinateur et Dispositif de Sondage par Ultrasons’, France Patent No FR 10/56217, July 2010.
S. Robert, O. Casula, E. Iakovleva, ‘Procédé de Détermination d’une Surface d’un Objet par Sondage Echographique, Programme d’Ordinateur Correspondant et Dispositif de Sondage à Ultrasons’, France Patent No FR 11/60399, November 2011.