Multidimensional complex wavelet transforms for guided waves directional filtering

Ultrasonic waves can be used to point out damages and defects in structural components. In fact, a guided wave injected into the specimen under investigation produces a reflected wave when it encounters damage along its propagation path. The analysis of the reflected waves allows determining the existence and localization of damage. This work presents a technique based on the Complex Wavelet Transform for the analysis of full wavefield data, which provides removal of non-informative components (incident wave, contributions from structural features) and exclusive reconstruction of reflected waves relevant to damage detection.