Design of a new type of omnidirectional shear-horizontal EMAT by the use of half-ring magnets and PCB technology

• A new type of OSH-EMAT was designed by the use half-ring magnets and PCB technology. The EMAT can generate in-plane circumferential Lorentz force in a non-contact manner. number radial conductors is proved to be linearly relating with output efficiency proposed EMAT. and/or receive SH0 mode guided wave good omnidirectional performance. In this paper, an electromagnetic acoustic transducer (EMAT) for generating receiving shear-horizontal (OSH) aluminum plate developed. consists specially printed circuit board (PCB) coil pair magnets. Vertical oriented static magnetic field alternative eddy current are applied excite along direction. three-dimensional finite element model has been established simulate distributions flux, current, exciting process SH wave. Further experimental results show that ultrasonic consistency performance excitation reception. design potential many non-destructive testing applications owing its low cost, acceptable accuracy convenient processing fabrication.