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The accuracy and speed of nondestructive testing can be improved by using multiple Lamb wave electromagnetic acoustic transducers (EMATs) instead of a single one. However, the methods for the arrangement of the multiple transducers have been seldom reported. In this paper, the acoustic field excited by the Lamb wave EMAT is described by a 3-D finite element (FE) model. Based on this acoustic field,...
Ultrasonic nondestructive testing technique has been widely applied to rail inspection. Due to the influence of probe placement and the complex structure of the rail, current devices are limited in the ability of detecting most defects existing in the rail base. In this paper, the electromagnetic acoustic transducer (EMAT) is applied to the inspection of rail base defects. Wave modes in the rail base...
Lamb wave has many applications in non-destructive testing as its advantages of the capability for long-range testing from a single location. Electromagnetic ultrasonic technique also has many advantages, such as being free of couplant and preconditioning. So, electromagnetic ultrasonic Lamb wave possesses great superiority in inspection. However, Lamb wave's characteristic of multi-modes and dispersion,...
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