Ultrasonic Detection Using Correlation Images (Preprint)
MISSOURI UNIV-COLUMBIA COLL OF ENGINEERING
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In ultrasonics, image formation and detection are generally based on signal amplitude. In this paper, we describe an amplitude independent approach for imaging and detection based on the similarity of adjacent signals, quantified by the correlation coefficient calculated between A-scans. Correlation coefficient images are introduced and shown with C-scan images to demonstrate flat-bottom-hole and crack detection in experimental data and planar defect detection at very low signal-to-noise ratio using simulated data. Receiver operating characteristic ROC analysis compares the new correlation method and the classical method.
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