EVALUATION OF ELECTROMAGNETIC ACOUSTIC TRANSDUCER PERFORMANCE ON STEEL MATERIALS

摘要

Electromagnetic Acoustic Transducers (EMATs) can be an attractive alternative to standard piezoelectric probes thanks to their contactless nature. However, their positive features are partly counterbalanced by the dependence of their performance on material properties. A wide variety of steel materials is employed in industry, so it is important to assess EMAT behaviour on different grades. Experimental data of EMAT performance on a wide range of steels is presented. A validated Finite Element model is used to evaluate the data and the relative importance of the transduction mechanisms.