title: Using cross-correlations of elastic diffuse fields for attenuation tomography of structural damage.
abstract: A scanning laser Doppler vibrometer is used to measure, at multiple grid points, the diffuse vibrations (50-150 kHz) propagating over a thin aluminum plate with complex geometry. These diffuse vibrations were generated by a few pulsed laser impacts randomly distributed outside of the measurement grid. The pairwise cross-correlations of the diffuse field recorded at all grid points provided an estimate of the first antisymmetric Lamb mode direct arrival between these grid points. Attenuation tomography imaging of a simulated structural damage is performed based on the relative amplitude variations of these direct arrivals between the damaged and undamaged conditions.
authors.affiliation: School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0150, USA.
authors.forename: Adelaide
authors.initials: A
authors.lastname: Duroux
authors.forename: Karim G
authors.initials: KG
authors.lastname: Sabra
authors.forename: James
authors.initials: J
authors.lastname: Ayers
authors.forename: Massimo
authors.initials: M
authors.lastname: Ruzzene