Spectral damping in Barkhausen noise

Tiitto, S.; Säynäjäkangas, S.

doi:10.1109/tmag.1975.1058960

Cited by 35 publications

(10 citation statements)

References 5 publications

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“…When a ferromagnetic material is subjected to an external varying magnetic field, a voltage signal is induced in a pick-up coil due to changes in magnetisation of material caused by the discrete movement of magnetic domain walls overcoming various pinning sites in the material [1]. This phenomenon of electromagnetic activity known as Magnetic Barkhausen noise [1][2][3]. Jiles and Suominen [3] while working on assessment of micro-hardness and residual stress observed that the skin-depth of MBN at the same analyzing frequency decreases for materials having higher specific electric conductivity and relative permeability.…”

Section: Introductionmentioning

confidence: 99%

Influence of applied magnetic field strength and frequency response of pick-up coil on the magnetic barkhausen noise profile

Vashista

Moorthy

2013

Journal of Magnetism and Magnetic Materials

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The influence of applied magnetic field strength and frequency response of the pickup coil on the shape of Magnetic Barkhausen Noise (MBN) profile have been studied. The low frequency MBN measurements have been carried out using 5 different MBN pickup coils at two different ranges of applied magnetic field strengths on quenched & tempered (QT) and case-carburised & tempered (CT) 18CrNiMo7 steel bar samples. The MBN pickup coils have been designed to obtain different frequency response such that the peak frequency response varies from ~ 4 kHz to ~32 kHz and the amplitude of low frequency signals decreases gradually. At lower applied magnetic field strength of ±14000 A/m, all the pickup coils produced a single peak MBN profile for both QT and CT sample. However, at higher applied magnetic field strength of ±22000 A/m, the MBN profile showed two peaks for both QT and CT samples for pickup coils with peak frequency response up to ~17 kHz. Also, there is systematic reduction in peak 2 for QT sample and asymmetric reduction in the heights of peak 1 and peak 2 for CT sample with increase in peak frequency response of the pickup coils. The decreasing sensitivity of pickup coils with increasing peak frequency response to MBN signal generation is indicated by the gradual reduction in width of MBN profile and height of peak 2 in QT sample. The drastic reduction in peak 1 as compared to peak 2 in CT sample shows the effect of decreasing low frequency response of the pickup coils on lowering skindepth of MBN signal detection. This study clearly suggests that it is essential to optimise both maximum applied magnetic field strength and frequency response of the MBN pickup coil for maximising the shape of the MBN profile for appropriate correlation with the magnetisation process and hence the material properties.

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Section: Introductionmentioning

confidence: 99%

Influence of applied magnetic field strength and frequency response of pick-up coil on the magnetic barkhausen noise profile

Vashista

Moorthy

2013

Journal of Magnetism and Magnetic Materials

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“…The depth penetration of MBN signal is damped due to the skin effect, which is caused by the opposing eddy currents induced by the changing magnetic field. The damping of a noiselike signal as a Barkhausen noise, containing a spectral distribution of frequencies between f 1 and f 2 , can be described by a function of ( ) D x as described in Equation 3, where ( ) g f is the frequency spectrum of the captured signal within the selected frequency range, x is the depth of detection, / A πµ ρ = , µ is the permeability of the material and ρ is the electrical resistivity of the material 27,28 .…”

Section: Methodsmentioning

confidence: 99%

Effect of Shot Peening Treatment on Residual Stress and Magnetic Barkhausen Noise of AISI 201LN and AISI 304L Stainless Steels

et al. 2022

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This work evaluates microstructural changes and residual stresses on surface samples of AISI 201LN and 304L subjected to shot peening. The residual stresses were measured by Xray diffraction and magnetic Barkhausen noise (MBN) in different shot-peened conditions. The results showed that the 201LN steel presented more martensite than the 304L steel in the initial condition, but with lower δferrite contents. These ferromagnetic phases were present in a low amount with high tensile residual stresses due to brush cleaning and light coldrolling in the final stage of the fabrication process. The shot peening process promoted compressive residual stresses mainly in the δferrite. However, some "fresh" martensite exhibited tensile residual stress represented by higher and thinner peaks, which together with the low-intensity amplitude in the neighborhood, represented all formed martensite. Thus, small microstructural changes provoked high residual stresses behavior, which can be detected in ferromagnetic phases by MBN.

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“…The Barkhausen noise signals were measured within a frequency range of 70-200 kHz using bandpass filtering with a sampling frequency of 2.5 MHz. The result of these measurement parameters is an approximate effective measurement depth of 25-50 µm [4].…”

Section: Methodsmentioning

confidence: 99%

Residual Stress Measurement of Shot-Peened Steel Rings by Barkhausen Noise, ESPI Hole-Drilling and X-Ray Diffraction

Rickert¹,

Thomas²,

Suominen

2014

AMR

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Shot-Peening is used to generate surface-near compressive residual stresses in final shape parts, usually to improve their fatigue properties. The success of the process can be checked in different ways. XRD and Hole-Drilling determine quantitative stress depth profiles in specific locations. Barkhausen noise measurements evaluate a near-surface zone in real-time and can cover large areas quickly. It is a fully nondestructive method. This study compares ESPI Hole-Drilling, which is a very fast technique, and XRD, which is very precise but slower, to Barkhausen Noise results for the case of three steel rings shot-peened with different intensities.

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Spectral damping in Barkhausen noise

Cited by 35 publications

References 5 publications

Influence of applied magnetic field strength and frequency response of pick-up coil on the magnetic barkhausen noise profile

Influence of applied magnetic field strength and frequency response of pick-up coil on the magnetic barkhausen noise profile

Effect of Shot Peening Treatment on Residual Stress and Magnetic Barkhausen Noise of AISI 201LN and AISI 304L Stainless Steels

Residual Stress Measurement of Shot-Peened Steel Rings by Barkhausen Noise, ESPI Hole-Drilling and X-Ray Diffraction

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