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A migration based reconstruction algorithm for the imaging of defects in a plate using a compact array
Published in Techno Press
Volume: 4
Issue: 4
Pages: 449 - 464
An array based, outward monitoring, ultrasonic guided wave based SHM technique using a single transmitter and multiple receivers (STMR), with a small footprint is discussed here. The previous implementation of such SHM arrays used a phase-reconstruction algorithm (that is similar to the beam-steering algorithm) for the imaging of reflectors. These algorithms were found to have a limitation during the imaging of defects/reflectors that are present in the "near-field" of the array. Here, the "near-field" is defined to be approximately 3-4 times the diameter of the compact array. This limitation is caused by approximations in the beam-steering reconstruction algorithm. In this paper, a migration-based reconstruction algorithm, with dispersion correction in the frequency domain, is discussed. Simulation and experimental studies are used to demonstrate that this algorithm improves the reconstruction in the "near-field", without decreasing the ability to reconstruct defects in the "far-field" in both isotropic and anisotropic plates.
About the journal
JournalSmart Structures and Systems
PublisherTechno Press
Open AccessNo