Non-contact imaging for delamination using diffuse field concept

The non-contact measurement called scanning laser source (SLS) technique is applied to imaging inspection for subsurface delamination in a metal block and the effect of frequencies used for imaging is discussed with finite element method and experiments for an aluminum alloy block. First, FE formula...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2019-07, Vol.58 (SG), p.SGGB07
Main Authors: Nakao, Shogo, Hayashi, Takahiro
Format: Article
Language:English
Subjects:
Aluminum base alloys
Broadband
Delamination
Finite element method
Frequency ranges
Imaging
Inspection
Narrowband
Resonant frequencies
Vibration
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Summary:The non-contact measurement called scanning laser source (SLS) technique is applied to imaging inspection for subsurface delamination in a metal block and the effect of frequencies used for imaging is discussed with finite element method and experiments for an aluminum alloy block. First, FE formulation for the vibration of a closed structure described the relation between resonances in the whole structure and vibration distributions, and FE calculation provided the resonant frequencies and the resonant patterns of a metal block, which agreed well with experimental results. Next, images were obtained for a specimen with delamination using the SLS technique. When narrowband burst waves were used, the delamination images were largely different due to the resonances. For broadband chirp waves, the clear delamination images could be obtained in the frequency ranges including multiple resonant frequencies because diffuse fields were well established.
ISSN:0021-4922
1347-4065
DOI:10.7567/1347-4065/ab0ada