Using magnetic hysteresis for testing electroconductive objects in pulsed magnetic fields

Calculation of residual magnetic-field distributions upon hysteretic interference of a pulsed magnetic field

“…When returning to the data of [3], we can conclude that the thickness of metallic plate can be determined to a high accuracy based on the central maximum magnitude. In particular, the increase in the voltage from U m = 40 to U m = 100 mV corresponds to the logging range of 60 mV.…”

“…The measurements were performed at magnetic field strengths of from 1 × 10 2 to 1 × 10 5 A/m and a magnetic field strength rise time of from 1 × 10 -6 to 5 × 10 -4 s using an experimental setup [3]. The magnetic field pulse modes produced by the setup are a half wave pulse, a quarter wave pulse (exponent), a half wave pulse with a single inverse magnetic field (H) surge, a half wave pulse with several inverse magnetic field (H) surges, a linearly rising pulse, a trapezoidal pulse, a pulse consisting of three linear portions that differ in slope, and other pulses.…”

“…The aim of the present study is to develop a hysteretic interference method for the inspection of objects that are made from electoconductive and magnetic materials, which increases the accuracy of determina tion of their specific electrical conductivity σ, magnetic permeability μ, uniformity of σ and μ distribu tions, thickness, and parameters of discontinuity flaws in the materials. In this case, the development of the aforementioned method is realized via the application of digital calculations that are performed with the Delphi programming language.The phenomenon of hysteretic interference of the magnetic field, which consists in the appearance of regular maxima and minima in the distributions of remanent magnetization of a magnetic medium that result from the action of different polarity magnetic field pulses applied to it, was considered in [1][2][3]. The possibilities of the selection of electroconductive objects based on the time constant of the transition process in applying rectangular magnetic field pulses to an object were discussed in [4], in which a tran sition process method was used and the induction flux through a test object was calculated.…”

“…The phenomenon of hysteretic interference of the magnetic field, which consists in the appearance of regular maxima and minima in the distributions of remanent magnetization of a magnetic medium that result from the action of different polarity magnetic field pulses applied to it, was considered in [1][2][3]. The possibilities of the selection of electroconductive objects based on the time constant of the transition process in applying rectangular magnetic field pulses to an object were discussed in [4], in which a tran sition process method was used and the induction flux through a test object was calculated.…”