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Authors: Paul Kassis (The EDF Group) , Nicolas Paul (The EDF Group) , Antoine Ferre (The EDF Group) , Andreas Schumm (The EDF Group) , Pierre-Emile Lhuillier (The EDF Group)
This work focuses on non-destructive examinations using array probe ultrasonic waves on complex materials generating a high structural noise on the examined area. During an ultrasonic examination, multiple scattering of the ultrasonic waves on the grain boundaries makes difficult the distinction between this structurally induced noise and a potential defect. The difficulty of the interpretation can moreover be increased in the near surface area because of the sub-surface wave. In order to ease the analysis of these acquisitions, some numerical processing methods are proposed. Statistical properties of the imaging results (for instance Total Focusing Method or Plane Wave Imaging) are first calculated on several sensor positions. These statistical properties are then used to post-process the imaging results and enhance any signals values that do not belong to the structural noise expected statistics. The method has been successfully tested on cast austenoferritic stainless steel coarsed-grainded mock-up, with several dB gain compared to the classical Total Focusing Method.
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How to Cite: Kassis, P. . , Paul, N. . , Ferre, A. . , Schumm, A. . & Lhuillier, P. . (2019) “Ultrasound array probe”, Review of Progress in Quantitative Nondestructive Evaluation.(0).