A pulsed laser to generate ultrasound has been used with an electromagnetic acoustic transducer (EMAT) to successfully detect ultrasonic waves for the fast online inspection of steel billets. Simulations of the ultrasonic signals have been performed by the finite element method to explain the laser-generated ultrasonic field and to compare it favourably with the signals detected by a water-cooled EMAT. With an understanding of the nature of the generated ultrasonic field, the separation between the laser and EMAT can be optimized for internal defect inspection using bulk waves and surface defect inspection, using Rayleigh waves, as the pulsed laser source can generate both these wave modes simultaneously.
No takes yet. Share an insight, caveat, or question.
Jian et al. (2007) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: