Title: On the feasibility of shearographic imaging of acoustic cross-modulation
Authors: Kalogiannakis, Georgios ×
Sarens, Bart
Van Hemelrijck, Danny
Glorieux, Christ #
Issue Date: 2008
Publisher: Wiley-Blackwell Publishing, Inc.
Series Title: Strain vol:44 pages:398-408
Abstract: The detectability of defects as well as their detection contrast have significantly
increased in recent years because of the use of nonlinear variants of the classical non-destructive
acoustic methods. The non-uniformity of stiffness and hysteresis around the area of a defect results
in strong non-classical acoustic nonlinearity, which can be used to effectively distinguish the presence
of defects. Motivated by the latest advances in nonlinear laser Doppler vibrometry and nonlinear
ultrasonics, we investigated the potential of shearography to detect the so-called cross-modulation
effect. This effect arises when a strong, low-frequency pump wave dynamically changes the elastic
response of a defect, so that the amplitude of a weak, high-frequency probing wave passing through
the defect is modulated. As a result, the frequency spectrum of the response contains mixed
frequency components, which are directly attributed to the underlying defect.
ISSN: 1475-1305
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter and Biophysics
× corresponding author
# (joint) last author

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