Scattering Analysis for Crack-like Defects using Laser Ultrasonic Array

• DOI: 10.32548/rs.2024.022
• Publication Date: 2024-11-07T14:13:32Z
• Authors: Peter Lukacs; Geo Davis; Theodosia Stratou...; ; Jie Zhang
• Keywords: Ultrasonic imaging

Laser Induced Phased Arrays use lasers for generation and detection of ultrasound, enabling remote, non-contact, couplant-free inspection on complex objects. In previous work LIPAs have been utilized to detect locate omni-directional specular reflectors within metallic samples by capturing the full matrix performing total focusing method. This study explores defect characterization through scattering matrices. Scattering matrices, acquired measuring amplitude a as function insonification angle, contain information relating shape, size orientation defect. Previously, matrices assumed omnidirectional sources receivers, case transducer-based phased arrays. Experimental can be correlated well with theoretical that are obtained via simulations. ultrasonics directivity patterns at non-destructive, thermoelastic regime more directional than transducers defer different wave modes. this we applying sensitivity matrix, which provides about amplitudes varying angles specific location The is based angular laser efficiencies enables correlation experimental ultrasonic data. Four machined slots considered 0°, 15°, 30°, 45° 60° relative surface, in an aluminum sample four were synthesized, matrix. data used extract form results compared sensitivity-weighted corresponding defects. Overall, good agreement was observed between allowing slots.