Issue << content << Index Based Triangulation Method for Efficient Generation of Large Three-Dimensional Ultrasonic C-scans


DOI: 10.12737/article_5b8cf128815126.05984945

2018. Vol.21. No. 3, pp. 17–22

Index Based Triangulation Method for Efficient Generation of Large Three-Dimensional Ultrasonic C-scans

C. Mineo, J. Riise, R. Summan, C. N. MacLeod, S. G. Piercev

The demand for high speed ultrasonic scanning of large and complex components is driven by a desire to reduce production bottlenecks during the non-destructive evaluation of critical parts.  Emerging systems (including robotic inspection) allow the collection of large data volumes in short time spans, compared to existing inspection systems. To maximize throughput, it is crucial that the reconstructed inspection data sets are generated and evaluated rapidly without a loss of detail. This requires new data visualization and analysis tools capable of mapping complex geometries whilst guaranteeing full part coverage. This paper presents an entirely new approach for the visualization of three-dimensional ultrasonic C-scans, suitable for application to high data throughput ultrasonic phased array inspection of large and complex parts. Existing reconstruction approaches are discussed and compared with the new Index Based Triangulation (IBT) method presented. The IBT method produces 3D C-scan representation, presented as coloured tessellated surfaces, and the approach is shown to work efficiently even on challenging geometry. An additional differentiating characteristic of the IBT method is that it allows easy detection of lack of coverage (an essential feature to ensure that inspection coverage can be guaranteed on critical components). Results demonstrate that the IBT C-scan generation approach runs over 60 times faster than a C-scan display based on Delaunay triangulation and over 500 times faster than surface reconstruction C-scans.
 
Keywords: C-scans; phased arrays; data visualisation; robotics; automated systems.
 
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