Journal
ULTRASONICS
Volume 48, Issue 2, Pages 117-134Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultras.2007.10.008
Keywords
guided waves; PWAS; piezoelectric; phased array; planar array; omnidirectional; EUSR; damage detection; SHM; NDE
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This paper presented development work of an in situ method for damage detection in thin-wall structures using embedded two-dimensional ultrasonic phased arrays. Piezoelectric wafer active sensors were used to generate and receive guided Lamb waves propagating in the plate-like structure. The development of a generic beamforming algorithm that does not require parallel ray assumption through using full wave propagation paths is described. A virtual beam steering method and device, the embedded ultrasonic structural radar, was implemented as a signal post-processing procedure. Several two-dimensional con. gurations were investigated and compared with beamforming simulation. Finally, rectangular shape arrays were developed for verifying the generic formulas and omnidirectionality. The rectangular arrays yield good directionality within the 360 degrees full range and are able to detect damage anywhere in the entire plate. (c) 2007 Elsevier B. V. All rights reserved.
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