METHOD OF RESOLUTION OF GROUP OF DEFECTS BY TOPOGRAPHY OF MAGNETIC FIELD WITH RECONSTRUCTION OF DISTRIBUTIONS OF MAGNETIC FIELDS OF INDIVIDUAL DEFECTS IN GROUP IN FERROMAGNETIC ARTICLE Russian patent published in 2004 - IPC

FIELD: nondestructive control of materials and ferromagnetic articles by methods of electromagnetic flaw detection. SUBSTANCE: method of resolution of group of defects by topography of magnetic field with reconstruction of distributions of magnetic fields of individual defects in group in ferromagnetic article consists in measurement of magnetic field above ferromagnetic article. Then double differentiation of obtained distribution of magnetic field with subsequent digital filtration is conducted, local extrema are exposed and used to establish number of defects in group and coordinates of location of defects in group, obtained distribution of magnetic field of group of defects is compared with distribution of magnetic field of theoretical model and distributions of magnetic fields of individual defects in continuity in ferromagnetic article are reconstructed. EFFECT: increased reliability of resolution of group of defects by topography of magnetic field and precision of reconstruction of distributions of magnetic fields of individual defects of continuity in ferromagnetic article. 2 dwg