The objective of this book is to develop an integrated
nondestructive testing (NDT) capability for the detection of
defects, damages, and rebars in the near-surface region of glass
fiber reinforced polymer (GFRP)-retrofitted concrete cylinders
through the use of far-field electromagnetic (EM) measurements (or
EM waves or radar signals). In this development, two far-field
monostatic ISAR (inverse synthetic aperture radar) measurement
schemes are identified for collecting radar measurements, and the
backprojection algorithm is applied for processing radar
measurements into spatial images for visualization and condition
assessment. Reconstructed images are further analyzed by
mathematical morphology to extract a numerical index representing
the feature of the image as a basis for quantitative evaluation. EM
waves in the frequency range of 8 GHz to 18 GHz are found effective
for damage detection in the near-surface region of the specimens.
Dielectric properties of materials are investigated for their use
in numerical simulation and for improving the precision of
reconstructed images.
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