A NOVEL CO-BASED AMORPHOUS MAGNETIC-FIELD SENSOR

A novel Co-based amorphous magnetic field sensor was developed in this paper. It is a combination of two identical coils which are wrapped i n one amorphous core, connected in anti-series, and they are induced b y two identical pulse current sources. This structure is simple to con struct and easy to optimize. Two optimizing methods: negative feedback coil and bias magnetic coil, greatly improved the sensor's properties (linearity, sensitivity and dynamic range). At present, it is used in testing micro flaws in pipelines. (C) 1998 Elsevier Science S.A. All rights reserved.