Apparatus and method for the non-destructive determination of the content of the magnetizable and/or non-magnetizable portion of a sample

A method for the non-destructive determination of the content of the magnetizable and/or non-magnetizable portion of a sample, comprising:

• providing the sample in an air gap of a magnetically conductive yoke;
• generating an alternating magnetic field B using an alternating magnetic field strength H of an excitation coil in the yoke;
• collecting first measurement data relating to the sample using at least one measuring device which is inductively coupled to the yoke;
• and
• determining the magnetizable and/or non-magnetizable content portion in the sample by comparing the first measurement data to second measurement data relating to a reference sample that has a known magnetizable and/or non-magnetizable content portion,
• wherein during the collection of the first and second measurement data relating to the sample and the reference sample with the aid of the excitation coil, either:
• the same alternating magnetic field strength H is applied to both the reference sample and the sample, in which case a difference between the two collected sets of measurement data based on the different magnetic fields B of the reference sample and the sample is included as a measure in the determination of the content for the magnetizable and/or non-magnetizable content portion of the sample,
• or
• the same alternating magnetic field B is applied to both the reference sample and the sample, in which case a difference between the two collected sets of measurement data based on the different magnetic field strengths H of the reference sample and the sample is included as a measure in the determination of the content for the magnetizable and/or non-magnetizable content portion of the sample.