Stabilization of Barkhausen noise readings by controlling a surface field waveform

0431286 - FZÚ 2015 RIV GB eng J - Článek v odborném periodiku
Stupakov, Oleksandr
Stabilization of Barkhausen noise readings by controlling a surface field waveform.
Measurement Science and Technology. Roč. 25, č. 1 (2014), s. 1-8. ISSN 0957-0233. E-ISSN 1361-6501
Grant CEP: GA ČR GA13-18993S
Institucionální podpora: RVO:68378271
Klíčová slova: magnetic Barkhausen noise * surface field measurement * digital feedback control * non-destructive testing
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 1.433, rok: 2014

This work gives a clear experimental proof that precise control of the surface magnetic field stabilizes the subsurface Barkhausen noise readout with respect to the magnetizing yoke lift-off. The surface magnetic fields above the sample were measured at two different distances by Hall sensors; the real sample field was obtained by linear extrapolation of these surface field waveforms to the sample face. This extrapolated field waveform was then adjusted to the standard triangular/sinusoidal shapes with a multi-parameter digital feedback procedure. The Barkhausen noise signal was measured locally with a bobbin coil placed on the same surface area where the magnetic field was measured.
Trvalý link: http://hdl.handle.net/11104/0235864