METHOD AND APPARATUS FOR DETERMINING A CURRENT IN A CONDUCTOR

摘要

The present invention provides a method of determining a current in a conductor. The method comprises the steps of determining the n<th> spatial derivative of at least one vector component of the magnetic field associated with the current at at least one position and calculating the current from the n<th> spatial derivative. The present invention also provides an apparatus for determining a current in a conductor. The apparatus comprises a means for determining at least one vector component of the magnetic field associated with the current at at least two different positions anda means for determining the n<th> spatial derivative of at least one vector component of the magnetic field from the or each vector component of the magnetic field measured at the at least two positions. The apparatus also comprises a means for calculating the current from the n<th> spatial derivative.