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1 April 2019 Nonlinear phased array imaging using phase (Conference Presentation)
Anthony J. Croxford, Jack Potter, Philippe Blanloeuil
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Proceedings Volume 10972, Health Monitoring of Structural and Biological Systems XIII; 109721J (2019) https://doi.org/10.1117/12.2515808
Event: SPIE Smart Structures + Nondestructive Evaluation, 2019, Denver, Colorado, United States
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.
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Anthony J. Croxford, Jack Potter, and Philippe Blanloeuil "Nonlinear phased array imaging using phase (Conference Presentation)", Proc. SPIE 10972, Health Monitoring of Structural and Biological Systems XIII, 109721J (1 April 2019); https://doi.org/10.1117/12.2515808
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KEYWORDS
Phased arrays
Imaging arrays
Phase measurement
Ultrasonics
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