Symmetric response obtained with an orthogonal fluxgate operating in fundamental mode

Summary form only given. Magnetic field sensors are important for building automated functions in production lines, intelligent transportation systems, security systems and so on. The orthogonal fluxgate mechanism provides miniaturized low-cost magnetic sensors which can be incorporated in a compact electronic systems. The author proposed a new operating mode, fundamental mode, for the orthogonal fluxgate in which greater linear response and higher sensitivity can be obtained with an as-cast amorphous wire core compared to the conventional orthogonal fluxgate mechanism where the second harmonic is a measure of applied magnetic field. When the magnetic anisotropy is present, however, in an amorphous wire at off circumferential direction, the offset may arise and the input-output response curve becomes asymmetric with respect to the origin. In this paper, a method is presented to solve this problem.