Characterization of Delamination and Disbonding in Stratified Dielectric Composites by Millimeter Wave Imaging

摘要

A monostatic backscatter millimeter wave imaging system was utilized for nondestructive characterization of defects in low-loss composites of Kevlar/epoxy. De-fects consisting of subsurface delamination and disbonding defects were successfully detected and characterized. Images are constructed by measuring the relative amplitude and phase of the reflected radiation. The results clearly indicate the potential of such high-frequency systems for nondestructive characterization of small defects in low-loss dielectric composite materials.