Laser-Ultrasonics (LUS) provides a means of obtaining microstructure information and NDT data continuously in both in the laboratory industrial quality control systems. Ultrasound is generated and recorded using lasers, which permits remote, non-contact operation and the capability of working at high temperatures or/and with at moving surfaces. This paper reports results from experiments aimed at industrial in-line applications during processing of aluminium. The investigations cover LUS abilities to detect possible defects in extruded profiles and in friction stir welds (FSW). The results show that LUS is a potential tool to use for these applications although data interpretation may be complicated. Compared to other NDT devices, the LUS approach has unique and considerable advantages due to its remote operation, especially when complemented with fiber optics. This enables operation under conditions where transducer and EMAT devices are difficult or impossible to implement.
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