Electromagnetic-acoustic converter with combined magnetization

Abstract

This paper presents an innovative approach to improving the performance of electromagnetic-acoustic transducers (EMATs) for nondestructive testing (NDT) of ferromagnetic metal products. A novel design utilizing both a permanent magnet with reduced field intensity and an additional pulsed magnetization mechanism is proposed. This configuration significantly enhances inspection sensitivity, reduces the attraction force between the converter and the test object, and enables higher probing frequencies without overheating issues. Experimental results demonstrate the effectiveness of the proposed system, offering up to a 40% increase in signal amplitude.