Defect detection by surface acoustic waves generated by a multiple beam laser

C. Chenu (1) , D. Royer (2) , M. Fink (2)

1 LOA - Laboratoire Ondes et Acoustique (UMR 7587)
2 IL - Institut Langevin - Ondes et Images (UMR7587)

Laser-induced Surface Acoustic Wave (SAW) pulses of large amplitude have been launched on the surface of metallic samples. The non contact generation process involves a rectilinear set of photothermal sources equivalent to a phased array of ultrasonic transducers. Line and point source arrays created by a 16-beam YAG laser have been implemented. Two sets of experiments are presented: i) non destructive testing of thin surface breaking slots with giant SAW pulses launched by the line source array, ii) sectorial beam scanning of the surface by SAW generated by the point source array.

Mots clés: Acoustic signal detection; Surface acoustic waves; Acoustic waves; Surface emitting lasers; Phased arrays; Ultrasonic transducer arrays; Acoustic pulses; Optical pulses; Ultrasonic transducers; Optical arrays

Domaines: Acoustique [physics.class-ph]

C. Chenu, D. Royer, M. Fink. Defect detection by surface acoustic waves generated by a multiple beam laser. 1995 IEEE Ultrasonics Symposium. An International Symposium, Nov 1995, Seattle, France. pp.821-824, ⟨10.1109/ULTSYM.1995.495692⟩. ⟨hal-01843218⟩