| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 6758458 | NDT & E International | 2014 | 6 Pages |
Abstract
Advantages of pulsed excitation current over conventional harmonic excitation for measuring the thickness of a ferromagnetic plate are studied. Compared with the sinusoidal voltage induced by harmonic excitation current, the time-domain voltage induced by pulsed current is highly more sensitive to the thickness. Quantitative proof of this conclusion is provided by solving the normalized derivatives with respect to the thickness. Furthermore, the effects of the time constant of pulsed current on the measuring sensitivity are examined, and an optimal range of the time constant is proposed. Finally, the theoretical model is verified by experimental results.
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Authors
Xingle Chen, Yinzhao Lei,