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Proceedings Paper

Nonlinear phased array imaging using phase (Conference Presentation)
Author(s): Anthony J. Croxford; Jack Potter; Philippe Blanloeuil

Paper Abstract

Previous work has reported how a phased array can be used in two operating modes to detect nonlinear features. Specifically firing each element individually, as in a classic full matrix capture, and firing all elements at once with an appropriate delay to form a physical beamform, as in classic beamforming. If the difference in the energy of these two approaches is compared then nonlinearity in the material can be measured. This approach has proven effective, but greater sensitivity is desired. This paper studies how the phase of the received signal can be used to characterise nonlinearity. The underlying approach is first investigated and it is shown that phase information is preserved in the diffuse ultrasonic field. Then analytical and numerical models are presented to show that a tightly closed crack in a part should lead to an offset in the measured phase. Experimental results are then presented to validate these conclusions and the benefits of such an approach discussed.

Paper Details

Date Published: 1 April 2019
Proc. SPIE 10972, Health Monitoring of Structural and Biological Systems XIII, 109721J (1 April 2019); doi: 10.1117/12.2515808
Show Author Affiliations
Anthony J. Croxford, Univ. of Bristol (United Kingdom)
Jack Potter, Univ. of Bristol (United Kingdom)
Philippe Blanloeuil, The Univ. of New South Wales (Australia)

Published in SPIE Proceedings Vol. 10972:
Health Monitoring of Structural and Biological Systems XIII
Paul Fromme; Zhongqing Su, Editor(s)

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