Development of an on-line system for precision dimensional measurements in electrical steels using approach to ferromagnetic saturation

A system based on a measurement technique magnetisation near saturation is presented that allows high precision measurement of dimensional parameters of iron alloys. Extensive measurements in electrical steel laminations show high accuracy in measurement of cross section area of the strips. The technique uses approach to saturation magnetisation which has previously been shown to be dependent on alloying content of the materials. This system is proposed for on-line measurement of cross sectional area and thickness of electrical steels, and other types of ferromagnetic strip metals.