Patent ID: 7463024

Claim:
A method for analysing a magnetic signal or field registered by a multi-channel measuring device in a geometry in which an interesting source is in measurement volume V 1 , sensors measuring the field or components thereof outside volume V 1 inside volume V 2 , and the sources of magnetic interferences outside volume V 1 and V 2 in volume V 3 , where V 3 is infinite or finite, comprising: parametrising in volume V 2 the magnetic field produced by the interesting sources disposed in volume V 1 as a sum of elementary fields, where each elementary field is irrotational, sourceless and finite outside volume V 1 , in such a manner that for the parametrised magnetic field, a representation of the desired accuracy in volume V 2 is obtained; and parametrising in volume V 2 the magnetic field produced by the interference sources disposed in volume V 3 as a sum of elementary fields, where each elementary field is irrotational, sourceless and finite outside volume V 3 in such a manner that for the parametrised field, a representation of the desired accuracy in volume V 2 is obtained; and calculating the signal vector of the measuring device corresponding to each elementary field; and measuring the magnetic signal by sensors; and separating the fields that were produced from sources disposed in different volumes by calculating the components of the measured signal vector in the basis formed by the signal vectors associated with the elementary fields.