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Review of Non-Destructive Testing for Wind Turbine Bolts. [PDF]
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Barkhausen noise from sintered permanent magnets
IEEE Transactions on Magnetics, 1996We 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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High resolution magnetic Barkhausen noise measurements
NDT & E International, 1994Abstract 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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Magnetic Barkhausen noise measurements on magnetized pipeline steel
Insight - Non-Destructive Testing and Condition Monitoring, 2003Magnetic 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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Barkhausen Noise and Magnetic Amplifiers. II. Analysis of the Noise
Journal of Applied Physics, 1949The Barkhausen noise is calculated for ferromagnetic cores used in magnetic amplifiers. The method of analysis follows that used in the analysis of the shot effect. The signal-to-noise ratio for a typical magnetic amplifier circuit is calculated and compared with experiment.
Krumhansl, J. A., Beyer, R. T.
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Barkhausen Noise and Magnetic Amplifiers. I. Theory of Magnetic Amplifiers
Journal of Applied Physics, 1949An 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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Influence of magnetizing parameters on the magnetic Barkhausen noise
IEEE Transactions on Magnetics, 1992Magnetic 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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Magnetic Barkhausen Noise for Characterization of Recovery and Recrystallization
IEEE Transactions on Magnetics, 2010The capacity of magnetic Barkhausen noise (MBN) measurements to characterize recovery and the onset and evolution of recrystallization processes occurring during the annealing of cold rolled low carbon steel is analyzed. Cold rolled low carbon steel samples were isothermally annealed at laboratory under different conditions in order to promote various ...
Gurruchaga-Echeverria, K. (Kizkitza) +3 more
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Dual-Phase Steels Characterization Using Magnetic Barkhausen Noise Measurements
Materials Science Forum, 2005Magnetic Barkhausen noise measurements have been carried out to characterize ferritemartensite duplex microstructures and industrial Dual-Phase steels. We have first studied ferritemartensite duplex steels, for which the volume fraction and the carbon content of martensite were higher than for industrial Dual-Phase steels.
Hug, Aurélie +3 more
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Magnetic Barkhausen noise analysis of stress in steel
Current Applied Physics, 2004Abstract 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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