Accession Number : ADA544403


Title :   A Wavefield Imaging Technique for Delamination Detection in Composite Structures


Descriptive Note : Conference paper


Corporate Author : KOREA ADVANCED INST OF SCIENCE AND TECHNOLOGY DAEJEON (KOREA)


Personal Author(s) : Sohn, H ; Dutta, D ; Yang, J Y ; Desimio, M P ; Olson, S E ; Swenson, E D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a544403.pdf


Report Date : Aug 2010


Pagination or Media Count : 7


Abstract : In this study, a 1D scanning laser vibrometer and imaging techniques are utilized to detect hidden delamination in multi-layer composites. First, Lamb waves are excited by a surface-mounted piezoelectric wafer transducer and the corresponding out-of-plane velocities are measured by a scanning laser vibrometer. Second, wave field images are constructed from the scanned velocity signals, and the images are processed to highlight the interaction of Lamb waves with delamination. In particular, several image processing techniques such as Laplacian filtering are explored to accentuate the Lamb wave interactions with delamination from incident and reflected waves.


Descriptors :   *WAVE PROPAGATION , *COMPOSITE MATERIALS , *FIBER OPTICS , *IMAGE PROCESSING , *DAMAGE ASSESSMENT , *DELAMINATION , *OPTICAL SCANNING , POLYVINYLIDENES , LAPLACE TRANSFORMATION , PIEZOELECTRIC TRANSDUCERS , LAMB SHIFT , SOUTH KOREA , VIBROMETERS , WAVEGUIDES , COMPOSITE STRUCTURES , STRUCTURAL PROPERTIES , MONITORING , SYMPOSIA , MATHEMATICAL FILTERS


Subject Categories : Laminates and Composite Materials
      Optical Detection and Detectors
      Miscellaneous Detection and Detectors
      Fiber Optics and Integrated Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE