Results 161 to 170 of about 2,670,483 (201)

Barkhausen noise from sintered permanent magnets

IEEE Transactions on Magnetics, 1996
We introduce the well known Barkhausen technique as a tool for investigation of reversal processes in hard magnetic nucleation-type material. First results of our experiments show the occurrence of correlated grain switching not to be neglectible in the samples of sintered Nd-Fe-B as the volume fraction of multiple Barkhausen jumps reaches 50% near ...
G. Cuntze, H. Brendel, A. Hubert
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Robust estimation of magnetic Barkhausen noise based on a numerical approach

IMTC 2001. Proceedings of the 18th IEEE Instrumentation and Measurement Technology Conference. Rediscovering Measurement in the Age of Informatics (Cat. No.01CH 37188), 2002
This paper deals with a multi-features numerical instrument to estimate and qualify Barkhausen noise. Starting from traditional instruments based on RMS value of the band-pass filtered measured signal, the proposed method is based on the simultaneous analysis of the excitation voltage, the excitation current and the induced signal.
FLAMMINI, Alessandra, MARIOLI, Daniele, SARDINI, Emilio, TARONI, Andrea   +3 more
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High resolution magnetic Barkhausen noise measurements

NDT & E International, 1994
Abstract High resolution magnetic Barkhausen noise (MBN) measurements of slits in steel have been made using a small magnetic disk read head mounted in a U-shaped laminated sweep field core. Detection occurred for sweep fields oriented both parallel and perpindicular to a slit or through-cut.
Thomas W. Krause, D.L. Atherton
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Simulation of the magnetic Barkhausen noise

2020
Non-destructive magnetic controls are increasing in the industrial field 1. In this domain, the expectation for simulation tools able to anticipate the magnetic signature, improve the understanding and avoid fastidious and uncertain experimental pre-characterizations is high.
Fagan, Patrick, Ducharne, Benjamin, Daniel, Laurent, Skarlatos, Anastasios   +3 more
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Direct observation of magnetic Barkhausen noise around grain boundaries with high-spatial-resolution magnetic Barkhausen noise sensor

Measurement Science and Technology
Abstract Magnetic Barkhausen noise (MBN) is a useful signal for non-destructively characterizing various properties of ferromagnetic materials. It is suggested that MBN is mainly generated at grain boundaries because there are more pinning sites around grain boundaries.
Qiang Zhipeng, Li Peng, Wu Bin, Wang Nan, Wang Yujue, Li Guangyong, Liu Xiucheng   +6 more
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Magnetic viscosity and barkhausen noise in NdFeB-type permanent magnets

Journal of Magnetism and Magnetic Materials, 1997
Abstract The Barkhausen noise and magnetic viscosity in sintered and melt-quenched needles of anisotropic NdFeB-type magnets are examined. In the sintered magnet, the time integral of the Barkhausen signal during magnetic viscosity is shown to correlate with the change in the bulk magnetisation as measured using a vibrating sample magnetometer.
P.J. Thompson, R. Street
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Magnetic Barkhausen noise: stress-dependent mechanisms in steel

IEEE Transactions on Magnetics, 1996
Angular dependent magnetic Barkhausen noise energy signal measurements were performed on two similar pipeline steel samples up to tensile stresses of 330 MPa. Variations between the stress dependence of the energy signals at five investigated positions were interpreted in terms of the relative proportion of three stress-dependent mechanisms for ...
T.W. Krause, N. Pulfer, P. Weyman, D.L. Atherton   +3 more
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Magnetic Barkhausen Noise and Acoustic Barkhausen Emission

Abstract This article describes Magnetic Barkhausen Noise (MBN) and Acoustic Barkhausen Emission (ABE), to characterize residual stresses. The article describes measurement depth and spatial resolution, frequency measurements, and calibrations.
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Evaluation of a Nitrided Case Depth by the Magnetic Barkhausen Noise

Journal of Nondestructive Evaluation, 2017
Applicability of magnetic methods for non-destructive evaluation of plasma nitrided cases was investigated comprehensively. Nitrided layers of 60–800 $$~\upmu \hbox {m}$$ thicknesses were produced on a ...
Alexandr Stupakov, Róbert Farda, Miroslav Neslušan, Alexej Perevertov, Tetsuya Uchimoto   +4 more
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Plastic deformation effects on magnetic Barkhausen noise

AIP Conference Proceedings, 2000
Plastically deformed steel specimens were analyzed using surface magnetic Barkhausen noise (MBN). Three types of samples were investigated: mild steel specimens uniaxially deformed up to 40% strain, mild steel specimens deformed in bending to 0.2% longitudinal strain, cold-rolled nuclear reactor pressure vessel steel specimens from 0% to 60% reduction ...
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