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The ability of acoustic emission detection is enhanced by electromagnetic stimulation with external magnetic field. Different magnetic field directions, which are generated by permanent magnet, produce various vibrations of defect itself. In this paper, the deformation characteristics of electromagnetically induced acoustic emission (EMAE) are studied by the finite element method (FEM). The experimental...
A power source designed for electromagnetically induced acoustic emission (EMAE) is developed. The power source is used to load eddy current as electromagnetic stimulation to produce acoustic emission signals. The core of power source system is the control circuit which is based on 32-bit digital signal processor (DSP) chip TMS320F2812. Trigger pulse can be regulated through the variation of the program...
A new electromagnetically induced acoustic emission technique (EMAE) is presented in this paper. Due to the acoustic emission signal generated by the electromagnetically induced high-density eddy current pulse, EMAE can locate small flaws or cracks in thin-walled structures nondestructively in order to inspect specific areas without loading the whole structure. The acoustic emission (AE) signal captured...
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