ANALYTIC MODEL CALCULATION OF MAGNETIC-FIELD IN A MAGNETIC HALF-SPACEDUE TO SURFACE MAGNETIC CHARGE

By analogy with electrostatic field, a simple analytic model is presen ted on the distribution of magnetic field inside a test material as a result of surface inspection with a magnetic probe. According to this model, the penetration depth of the magnetic field is defined and the permeability of the material at different depths is calculated. Finall y, the magnetic flux inside the inspection head when placed on samples of different thicknesses is calculated and compared with experimental results.