MEASUREMENTS OF MAGNETIC-CIRCUIT CHARACTERISTICS FOR COMPREHENSION OFINTRINSIC MAGNETIC-PROPERTIES OF MATERIALS FROM SURFACE INSPECTION

A transfer function is presented for calculating magnetic field and fl ux density inside a test material as a result of surface measurement. By considering flux leakage, we introduce a parameter eta, called the leakage coefficient, which can be experimentally determined. It is int roduced into the equations to make the transfer function more practica l. The distribution of field inside a test material is then discussed in accordance with a surface magnetic charge model.