Nondestructive testing of fiber array with multiple missing fibers
Résumé
Our goal is to detect defects in composite materials
composed by multilayer planar plates with a periodic
set of circular cylindrical fibers embedded in each layer. As a
starter, the work presented is electromagnetic (EM) modeling
and imaging of missing fibers within a fiber array standing
in air. The multiple scattering method is utilized to analyze
the electromagnetic behavior, and the corresponding imaging
model is established directly from Lippman-Schwinger integral
formulation. Standard MUltiple SIgnal Classification (MUSIC)
and the proposed joint sparsity which borrows the idea of
sparse theory are applied to retrieve the locations of missing
fibers. Numerical results are provided to confirm availability
and accuracy of EM modeling and defect imaging.
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