Patent ID: 8098066

Claim:
A magnetometric device for evaluating a physical parameter (D, K), comprising: a circuit ( 1 ) which is sensitive to a magnetic field; a measurement circuit ( 2 ); and a magnetic field generator ( 3 ), wherein the sensitive circuit ( 1 ) has an inductance (L) which varies as a function of the magnetic field, the magnetic field generator ( 3 ) being adapted to subject the sensitive circuit ( 1 ) to a magnetic field of a polarisation which varies with said physical parameter (D, K) and which places the inductance (L) in a variable permeability zone, and the measurement circuit ( 2 ) being adapted to measure an electrical characteristic (F 1 ) of the sensitive circuit ( 1 ) which changes as a function of the permeability of the inductance (L), the physical parameter (D, K) being evaluated on the basis of at least one measurement (F 11 ) of this electrical characteristic (F 1 ) wherein the field generator ( 3 ) is adapted to reverse the polarity of the polarisation field, wherein the measurement circuit ( 2 ) is adapted to carry out, respectively during the application of the polarisation field with two reverse polarities, two corresponding measurements (F 11 , F 12 ) of the electrical characteristic (F 1 ), and wherein said physical parameter (D, K) is evaluated on the basis of at least these two measurements (F 11 , F 12 ) of the electrical characteristic (F 1 ).