Modeling of EMAT Magnetic Systems for Ultrasonic Waves Generation in Elastic Layer, in Static and Pulsed Magnetic Fields

摘要

Results for modeling of EMAT magnetic systems for shear and longitudinal ultrasonic waves generation in static and pulsed magnetic fields are represented. According to the study results, EMA transducers with permanent and pulsed magnetizing for shear and longitudinal ultrasonic waves generation were developed. The developed EMATs with permanent magnetizing are successfully applied for many years as parts of A1270 digital EMA thickness gages that are used in the process of testing of Proton rockets' hull elements and in other applications. EMATs with pulsed magnetizing were used for developing the A1270PM EMA thickness gage intended for thickness measurement and for spot welding testing.