Remote Optical Non-Destructive Inspection Technique for Metal and Composite Structures |
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Authors: | John M Webster Thangavel Thevar |
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Affiliation: | (1) School of Engineering, University of Aberdeen, King’s College, Aberdeen, AB24 3UE, UK |
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Abstract: | This paper presents a laser based non-destructive inspection technique which is purely non-contact. An acoustic device is
used to remotely excite the material under inspection while a scanning laser vibrometer is employed to measure the resulting
vibrations. The test materials, mostly aluminum or composite aircraft structures, have been successfully inspected from a
standoff distance of at least a meter. The NDI system clearly shows the defect locations overlaid on the images of the test
objects for ease of the end user. Metal and composite delamination and subsurface corrosion in aluminum structures are among
the defects that were detected. |
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Keywords: | Non-contact NDI Acoustic excitation Delamination detection Corrosion detection |
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