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Crack Sizing using Dual-Polarized Microwave SAR Imaging

A microwave surface-breaking crack characterization method using dual-polarized (e.g. transmitting and receiving two orthogonal linear polarization) wideband SAR imaging is described in this paper. A technique to extract the length of a detected crack using wideband SAR images is presented, using the measured resonant frequency of the crack. A method to determine the width of the crack is also discussed, in which the ratio of the SAR images made using polarization parallel and perpendicular to the crack length is used. Proof-of-concept simulations are performed, and a simple model is developed from the simulations that enables crack dimensions (width and length) to be estimated from the SAR image data. A crack sample with machined through notches of several widths and lengths was also designed, and subsequently used to successfully demonstrate the efficacy of this crack sizing technique.