Pulsed Magnetic Field near Metal Surface

The experimental dependences of the maximum strength of the secondary pulsed H (d) magnetic field near the surface of metal plates on their thickness obtained using a discrete magnetic field sensor (DMFS) and reduced to the primary source field strength are presented. The thickness of the plates varied from 0.015 to 2 mm. DMFS with aluminum and lead plates were subjected to magnetic field pulses of a linear inductor with a rise time from 5 to 60 mu s. Arctangent analytical functions H(d) have been found that are used to calculate the hysteresis interference of a pulsed magnetic field in a reflected wave in order to increase the sensitivity and accuracy of monitoring the thickness of metal objects, the specific electrical conductivity of their material, and continuity defects in them.