NDT PROCESS USING LAMB WAVES GENERATED/DETECTED BY ULTRASONIC PHASED ARRAY PROBES FOR THE DEFECT DETECTION IN METALLIC AND COMPOSITE PLATES

摘要

One gel-coupled multi-element matrix ultrasonic probe is driven using the phased array principle, for launching/detecting pure Lamb modes in/from different directions along various types of plates, and taking into account the modes frequency and angular dispersive effects. It allows rapid inspection of large structures, from one remote fixed position of the probe. The set-up and principle of the process are presented, as well as its measured performances in terms of modal selectivity and directivity. Finally examples of defect detection are shown.