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Updated: Jul 10, 2026

Echo Particle Image Velocimetry
Published on: December 27, 2012
Spatial correlation coefficient images for ultrasonic detection
Raina Cepel1, K C Ho, Brett A Rinker
1Department of Electrical and Computer Engineering, University of Missouri-Columbia, Columbia, MO 65211, USA.
Abstract:
In ultrasonics, image formation and detection are generally based on signal amplitude. In this paper, we introduce correlation coefficient images as a signal-amplitude independent approach for image formation. The correlation coefficients are calculated between A-scans digitized at adjacent measurement positions. In these images, defects are revealed as regions of high or low correlation relative to the background correlations associated with noise. Correlation coefficient and C-scan images are shown to demonstrate flat-bottom-hole detection in a stainless steel annular ring and crack detection in an aluminum aircraft structure.
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