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DEFECT DETECTION AND IMAGING FROM PHASED ARRAY FOCUSING OF ULTRASONIC GUIDED WAVES

The use of numerical and phased array techniques to focus guided waves and perform inspection of plates and pipes has not been widely used; it represents an interesting solution for defect detection and localization. In addition, imaging of ultrasonic guided wave results using color coded B-Scans is also considered a highly valuable tool for data interpretation. While commercial ultrasonic phased array systems have both the ability to perform focusing and present data in B or S-Scan formats, they are not designed to perform guided wave focusing. The present paper presents an experimental study for the implementation of ultrasonic guided wave focal law algorithms into phased array systems. Focal laws are calculated for the inspection of plate structures using ultrasonic Lamb waves generated by the angle beam wedge method. The wedge properties and the considerations for guided waves imaging are outlined in this work.