Results 151 to 160 of about 2,523,401 (193)

Influence of magnetizing parameters on the magnetic Barkhausen noise

IEEE Transactions on Magnetics, 1992
Magnetic Barkhausen noise (MBN) measurements were made on a sample of pipeline steel as functions of magnetizing frequency and AC flux density in the sample. The observed MBN responses suggest a strong dependence on these magnetizing parameters. With increasing flux density in the sample, the MBN activity initially increases but finally begins to ...
A. Dhar, D.L. Atherton
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A System for Controllable Magnetic Measurements of Hysteresis and Barkhausen Noise

IEEE Transactions on Instrumentation and Measurement, 2015
A specially developed setup for precise measurement of the magnetic hysteresis and Barkhausen noise is presented in this work. A novelty of the setup consists in a unique combination of two main features: an accurate local determination of the magnetic field and an improved feedback control of the magnetization process.
Alexandr Stupakov, Oleksiy Perevertov, Vitalii Zablotskii   +2 more
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Barkhausen Noise and Magnetic Amplifiers. I. Theory of Magnetic Amplifiers

Journal of Applied Physics, 1949
An analysis is made of the operation of magnetic amplifiers or non-linear transformers. Open circuit output voltages are calculated for transformers driven by a sinusoidal primary current, and also for sinusoidal primary current plus a direct current bias. The case of a loaded secondary is also considered and it is shown that there exist conditions for
Krumhansl, J. A., Beyer, R. T.
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Magnetic Barkhausen noise measurements on magnetized pipeline steel

Insight - Non-Destructive Testing and Condition Monitoring, 2003
Magnetic barkhausen noise measurements on magnetized pipeline steel. Magnetic Barkhausen Noise (MBN) is created by the irreversible motion of 180-degree domain walls. It is sensitive to residual and applied stress in ferromagnetic materials such as pipeline steel and has therefore been proposed as a viable non- destructive evaluation technique for ...
A Hsu, L C Clapham, D L Atherton
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Magnetic Barkhausen noise analysis of stress in steel

Current Applied Physics, 2004
Abstract When a changing magnetic field is applied to a magnetic material, the domain walls move so domains aligned close to the field direction grow at the expense of those that are less aligned. The movement occurs in a series of sudden jumps leading to magnetic Barkhausen noise (MBN).
D.M. Stewart, K.J. Stevens, A.B. Kaiser
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Analog of the induction law for the magnetic Barkhausen noise

Journal of Magnetism and Magnetic Materials, 2020
Abstract The influence of coil turn number n and sample cross-section S on the Barkhausen noise signal has been studied. Combining the obtained results with our recent findings on the dynamic properties of the magnetic Barkhausen noise, we propose a Faraday-like relation for its rms envelope in the form U rms ( H ) ∝ n S · dH /
Alexandr Stupakov, Alexej Perevertov
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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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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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