Patent ID: 6844726

Claim:
Precision device ( 1 ) for measuring the components of the magnetic field comprising: a scalar magnetometer ( 2 ) supplying an output signal corresponding to the module of an applied magnetic field: at least two conductor coils (Ex, Ey, Ez) positioned around the said scalar magnetometer, the axes of these conductor coils (Ex, Ey, Ez) being orientated in different directions (Ox, Oy, Oz), means for powering each coil with a current with a determined frequency (Fx, Fy, Fz) specific to this coil, processing means ( 70 ) that receive the signal provided by the scalar magnetometer ( 2 ), and processing this signal to deduce the value of the continuous component along each of the axes of the coils, device characterised in that at least one of the means (Gx, Gy, Gz) that power each coil (Ex, Ey, Ez) with a current of a determined frequency (Fx, Fy, Fz) specific to each coil, produce at this frequency signals in phase and in quadrature, in that the processing means ( 70 ) which receive the signal provided by the scalar magnetometer ( 2 ) are capable of carrying out, apart from a synchronous demodulation in phase at least at the frequencies (Fx, Fy, Fz) powering the coils, a demodulation in quadrature for at least one of the frequencies (Fx, Fy, Fz) of the currents powering the coils (Ex, Ey, Ez), these demodulation means receiving, apart from the signal in phase generated by the power supply of the coils (Ex, Ey, Ez), the signal in quadrature from the generation means (Gx, Gy, Gz) and finally in that these processing means ( 70 ) include a calculation module ( 34 ) that provides, based on the results of the different demodulations, for each frequency, a signal corresponding to the corrected component (Bxc, Byc, Bzc) of the magnetic field applied along the axis (Ox, Oy, Oz) of the coil (Ex, Ey, Ez) powered at this frequency.