Journal
ULTRASONICS
Volume 48, Issue 8, Pages 731-738Publisher
ELSEVIER
DOI: 10.1016/j.ultras.2008.04.005
Keywords
Ultrasonic NDE; Composite materials; CFRP; SSP; Deconvolution; EM algorithm
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In this paper, signal processing techniques are tested for their ability to resolve echoes associated with delaminations in carbon fiber-reinforced polymer multi-layered composite materials (CFRP) detected by ultrasonic methods. These methods include split spectrum processing (SSP) and the expectation-maximization (EM) algorithm. A simulation study on defect detection was performed, and results were validated experimentally on CFRP with and without delamination defects taken from aircraft. Comparison of the methods for their ability to resolve echoes are made. (c) 2008 Elsevier B.V. All rights reserved.
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