FIELD: measuring.
SUBSTANCE: invention can be used for non-destructive determination of boundaries of homogeneous inclusions inside an object. Essence of the invention consists in the fact that the distribution of the vector function of magnetic induction of the field is measured and the analysed volume is represented by a set of parallel sections, by performing tomographic scanning of the object, aimed at detecting the effect of refraction of power lines of the changed vector field of magnetic induction, with subsequent reconstruction of boundaries of inclusions according to projection data, which are integral over time of emf generated by magnetic induction flow, reduced to width of magnetic measuring element. Reconstruction is realized by a back projection method with preliminary spatial filtering in the region of the original by convolution of projection data with a folding function. At the same time, before convolution, projection data are subjected to differentiation by selected direction, due to which in the reconstructed function in the places of unavoidable discontinuity of the first kind of the initial differentiated function there appear extrema with values exceeding the maximum rate of change of the function, which does not undergo discontinuities, of the point in space in the selected direction.
EFFECT: enabling determination of boundaries of hidden heterogeneous inclusions, which allow magnetisation by an external magnetic field which periodically varies in time, without mechanical penetration into the object.
1 cl, 2 dwg
