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

An apparatus for the non-destructive determination of the content of the magnetizable and/or non-magnetizable portion of a sample comprising:

• a first magnetically conductive yoke that has a first air gap for selectively receiving the sample or a reference sample;
• an excitation coil provided on the yoke;
• a measuring device inductively coupled to the yoke;
• an evaluation device connected to the measuring device, for determining the content of the magnetizable and/or non-magnetizable content portion of a sample;
• a first measuring coil, which is inductively coupled to the yoke, from which the measuring device collects measurement data;
• a regulating device that cooperates with the excitation coil in order to apply the same alternating magnetic field strength or the same alternating magnetic field in the first air gap for the reference sample or the sample;
• a differential circuit for generating difference data from the measurement data relating to the reference sample and the sample;
• and
• an evaluation device connected to the differential circuit for determining the content of the magnetizable and/or non-magnetizable content portion in the sample as a function of the difference data.

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

• a first magnetically conductive yoke that has a first air gap for receiving the sample;
• a first measuring coil inductively coupled to the first yoke;
• a second magnetically conductive yoke that has a second air gap for receiving a reference sample;
• a second measuring coil inductively coupled to the second yoke;
• an excitation coil inductively coupled to both of the first and second yokes;
• a measuring device that collects first and second measurement data from the first and second measuring coils;
• a differential circuit connected to the measuring device for generating difference data from the measurement data relating to the reference sample and the sample;
• and
• an evaluation device connected to the differential circuit for determining the content of the magnetizable and/or non-magnetizable content portion in the sample as a function of the difference data.

An apparatus for the non-destructive determination of the content of the magnetizable and/or non-magnetizable portion of a sample comprising:

• a magnetically conductive yoke that has a middle piece and two side legs adjoining the middle piece, each with a respective air gap, wherein a first air gap is embodied for insertion of the sample and a second air gap is embodied for insertion of a reference sample;
• at least one excitation coil provided on the middle piece of the yoke and having at least one first and second measuring coil that are provided on each of the two side legs and are inductively coupled to the yoke;
• a measuring device that collects measurement data from the first and second measuring coils;
• a differential circuit connected to the measuring device for generating difference data from the measurement data relating to the reference sample and the sample;
• and
• an evaluation device connected to the differential circuit for determining the content of the magnetizable and/or non-magnetizable content portion in the sample as a function of the difference data (Mdiff).