A Hall-sensor for automatic detection of domains in coated silicon iron

Abstract

For automatic detections of domains in SiFe sheets, field sensors of both, small effective area and very high sensitivity, are needed. In the case of the described sensor, high sensitivity is attained by means of a commercially available Hall plate with integrated pre-amplifier. Small effective area and close contact to the specimen are attained by means of a 25 μm thick strip of soft magnetic amorphous material, which is used as a bridge between sample and Hall plate. The presented results demonstrate that main domains of stress coated transformer sheets can be detected in an effective way.