Method and system for measuring relative concentrations of materials in a mixture by measuring (ac) dynamic magnetic susceptibility

A method for measuring relative concentrations of materials of a mixture, comprising:

• a/ providing an emission coil and at least one reception coil;
• b/ providing a mixture comprising n materials with different magnetic susceptibilities;
• c/ introducing the mixture into the at least one reception coil;
• d/ using an electric voltage generator to supply the emission coil with at least one non-zero excitation frequency so as to generate an excitation magnetic field, applying a given voltage by varying the at least one excitation frequency;
• e/ measuring a signal of the electric voltage induced in the at least one reception coil;
• and
• f/ determining the relative concentrations of the n materials based on a comparison between an overall susceptibility of the mixture obtained by the voltage measurement according to e/ and that of a reference mixture for which relative concentrations of the n materials are known.