Influence of Shielding on the Magnetic Field Measurement by Direct H-Coil Method in a Double-Yoked SST

This paper aims at describing the influence of shielding on the magnetizing magnetic field measured with an H-coil system, used in a double-yoked single-sheet tester. By the mean of a positioning system especially conceived for the purpose of this paper, the magnetic field is measured at different distances from the laminated sheet. The evolution of this field along the perpendicular line thus defined shows a distinctive behavior, whether the measure is realized in the presence of a magnetic shield or not. A description of the obtained experimental results is made, and a comparison with numerical models is realized. Finally, an explanation over the observed phenomena based on physical principles of electromagnetism is proposed.