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Title: Ultrasonic Evaluation and Imaging

Ultrasonic evaluation of materials for material characterization and flaw detection is as simple as manually moving a single-element probe across a speci-men and looking at an oscilloscope display in real time or as complex as automatically (under computer control) scanning a phased-array probe across a specimen and collecting encoded data for immediate or off-line data analyses. The reliability of the results in the second technique is greatly increased because of a higher density of measurements per scanned area and measurements that can be more precisely related to the specimen geometry. This chapter will briefly discuss applications of the collection of spatially encoded data and focus primarily on the off-line analyses in the form of data imaging. Pacific Northwest National Laboratory (PNNL) has been involved with as-sessing and advancing the reliability of inservice inspections of nuclear power plant components for over 35 years. Modern ultrasonic imaging techniques such as the synthetic aperture focusing technique (SAFT), phased-array (PA) technolo-gy and sound field mapping have undergone considerable improvements to effec-tively assess and better understand material constraints.
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Related Information: Integrated Imaging and Vision Techniques for Industrial Inspection: Advances and Applications Series: Advances in Computer Vision and Pattern Recognition, 393-412
Z Liu, H Ukida, P Ramuhalli and K Niel; Springer-Verlag, London, United Kingdom.
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Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
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United States
ultrasonic imaging; Synthetic Aperture Focusing Technique (SAFT); phased array (PA); flaw detection; sound field mapping; signal processing