Superparamagnetic transducer and corresponding magnetic field flow sensor for measuring a direct current

A magnetic field flow sensor for measuring a direct current, formed by at least one super-paramagnetic material transducer intended to be subjected to an external magnetic field to be measured induced by a current traversing a primary conductor formed by at least one electrical conductor of which at least a portion extends along an axis, characterised in that the sensor comprises at least:

• a super-paramagnetic material transducer comprising:
• at least one super-paramagnetic coil formed by a core with a longitudinal axis made of super-paramagnetic material around which at least one electrical conductor is wound, along the longitudinal axis;
• and
• at least one feedback winding;
• a rigid body with a longitudinal central axis, and two planar surfaces at each of the opposite ends of the body in the direction of the longitudinal central axis, both of these planar surfaces being substantially perpendicular to the longitudinal central axis;
• at least one support channel formed in the body and in which the super-paramagnetic coil is housed, the support channel extending parallel to the longitudinal central axis and opening onto both planar surfaces;
• and characterised in that the feedback winding is formed by an electrical conductor wound onto the outer surface of the body and along the longitudinal central axis, said transducer having two opposite free ends along the longitudinal central axis, the super-paramagnetic transducer being formed by the feedback winding coupled to said at least one super-paramagnetic coil extending between both free ends;
• and wherein said sensor comprises:
• a magnetic circuit having at least two planar surfaces parallel to one another and perpendicular to the longitudinal central axis, both planar surfaces being positioned opposite the respective free ends of the super-paramagnetic transducer;
• and in that said sensor is positioned relative to said primary conductor such that said axis is perpendicular to the longitudinal axis and parallel to said planar surfaces.