Analysis of an electromagnetic eddy current sensor of a flaw detector with an Ш-shaped core
Keywords:
defect, eddy current, sensor of the flaw detectorAbstract
The physics of the processes of an eddy current electromagnetic sensor of a flaw detector in cooperation with the controlled sample in the Ш-shaped core is revealed and described. The cases of absence of a defect (a crack or a void) and the presence of one or several defects are considered. The formulas for determining the parameters of the flaw detector are derived. In particular, the dependence of the pulling force, in the case of the ferromagnetic material under investigation, on the frequency of the generated signals. This tractive force occurs between the sensor core of the flaw detector and the controlled sample and makes it difficult for the sensor to advance along the material when searching for cracks. It is shown that the higher the frequency, the less the tractive effort. In addition, from the formula of the electromotive force of induction for both output signals of the measuring windings and for eddy currents, an increase in frequency provides an increase in these electromotive forces, thereby increasing the sensitivity of the sensor.References
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