Compound Magnetic Wire Sensor Assembling Cylindrical Ba Ferrite Magnet

Abstract. A new type of the compound magnetic wire sensor is developed. A search coil is wound around the wire which has a uniaxial magnetic anisotropy along the axis direction of the wire. In order to apply a negative magnetic field to the wire, two pieces of cylindrical Ba ferrite magnets are appended at the both ends of the wire. The sensor induces a constant pulse voltage of about 0.7 mVlturn which is independent of the changing rate of the positive external exciting field. The sensor consisted of the colnpound magnetic wire and 3000 turns search coil induces a stable output voltage of about 2V. It is also advantageous that this simple-structure sensor can be fabricated at a low cost 1