Development of a Dual-Mode Electromagnet-Based EMAT With Halbach Array Configuration
Electromagnetic acoustic transducers (EMATs) enable noncontact ultrasonic inspection without couplants, but bulk-wave excitation and modal selectivity depend strongly on the bias magnetic-field distribution. This article presents a dual-mode electromagnet-based EMAT with a Halbach-type bias configuration (DMHB-EMAT) fo...