Characteristic analysis of electromagnetic acoustic transducers for helical shear horizontal wave based on magnetostrictive effect

The electromagnetic ultrasound detection technology provides an efficient method to inspect the structural health status. For pipeline structure, guided ultrasonic wave propagating along axial direction has been focus of current research. However, helical owns advantage obtaining defect information in extra angles and not explored sufficiently. In this work, a transducer with sector configuration is designed for generating shear horizontal waves pipeline. magnetostrictive effect analyzed, model built finite element simulation software COMSOL Multiphysics. field displacement distribution are studied. To evaluate performance transducer, half divergence angle defined measure acoustic beam capacity waves. Corresponding experiments also implemented analyze influencing factors design transducer. results indicate that pulse cycle affects slightly. compromise should be considered when designing central because it influences signal amplitude further imaging resolution contradictory way.