MAGNETIC-FIELD OF A DEFECT INSIDE THE DEFECT CAVITY AND NEAR-THE-SURFACE OF THE ARTICLE

We have measured the field of a defect of the slot type (modeling a fi ssure) inside the defect cavity, near the surface of the specimen, and for different gaps between the probe and the surface using flat induc tion coils of different thicknesses. We have shown that the probe dime nsions and the gap and also the range of measurable defect widths cons iderably affect their classification according to certain parameters. The measurements of the field of the defect may be made independently of the defect width only within limited intervals of the defect parame ters, determined by the gap and by the dimensions of the probe.