Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Fundamental-mode orthogonal fluxgate magnetometer is developed for the ribbon core sensor head. When the dc bias current is not large enough, the magnetometer is much noisier than that with a wire core sensor head. The source of the noise is attributed to many small jumps in the magnetization process of the ribbon core. The mechanism is explained with a simple model based on the Storner-Wohlfarth model. This noise can be reduced by increasing the dc bias current to 0.2 A or more for a 1 mm wide Metglas 2714A ribbon core. The noise becomes as small as that obtained with a wire core sensor head. An adaptor circuit is introduced to interface a ribbon core sensor head and driving circuit designed for a wire core sensor head.