Measurement of magnetostriction and magnetic properties in an open magnetic circuit

In order to measure a.c. magnetostriction and a.c. magnetic properties of magnetic sheet samples, an open circuit magnetizing system, which has a pair of magnetic exciting coils, has been constructed to realize uniform magnetization over a considerably large area in the sample. We measured magnetostriction by a Michelson interferometer using He–Ne laser and measured B–H properties by a B coil, double H coils and a compensation coil. Thus, magnetostriction and magnetic properties can be measured simultaneously under a defined magnetizing condition without external constraint by yokes.