Measurements

The FOERSTER measuring instruments MAGNETOSCOP, MAGNETOMAT, KOERZIMAT HCJKOERZIMAT MS and 3-AXIS-MAGNETOMETER are used for precision testing of the magnetic properties of metals and therefore can also be applied in quality control.

Please find below an overview of and additional information on the magnetic measuring values that can be determined with our units.

Coercive field strength

Coercive field strength HCJ is the intensity of an applied magnetic field, which is required to reduce the magnetization of ferromagnetic material completely, so that the magnetic polarization J is zero. KOERZIMAT can determine coercive field strength HCJ of material and manufactured components almost geometry independent in an open magnetic circuit in accordance with IEC 60404-7. It is not necessary to manufacture test specimen of specific size or shape.

Magnetic dipole moment

The magnetic dipole moment is a measure of the strength of a magnetic dipole. KOERZIMAT can determine the magnetic saturation dipole moment jS almost geometry independent in accordance with IEC 60404-14. It is not necessary to manufacture test specimen of specific size or shape.

Permeability

Magnetic permeability µ is the degree of magnetization of material in response to a magnetic field. It is the ratio of magnetic flux density B and magnetic flux H. The physical constant µ0 is the magnetic permeability in vacuum. Relative permeability µr is the ration of µ and µ0. MAGNETOSCOP and MAGNETOMAT with permeability probe will determine relative permeability of material and manufactured components in accordance with IEC 60404-15, ASTM A342M and VG 95578. It is not necessary to produce test specimen of specific size or shape.

Saturation magnetization

Saturation magnetization is the maximum possible magnetization of ferromagnetic material, characterized by parallel orientation of all magnetic moments inside the material. KOERZIMAT can determine the magnetic saturation dipole moment jS and the derived weight specific saturation magnetization σS (4πσ) of material and manufactured components, almost geometry independent using the withdrawal method in accordance with IEC 60404-14. It is not necessary to manufacture test specimen of specific size or shape.

Magnetic flux density

Magnetic flux density B a measure of magnetic field strength is the amount of magnetic flux through a unit area taken perpendicular to the direction of the magnetic flux. It can be described in terms of a vector field. Fluxgate sensors can determine magnitude and direction of B. Using MAGNETOSCOP and MAGNETOMAT magnetometer with appropriate sensors, magnetic flux density can be determined simultaneously in 1 up to 3 directions. By means of a differential probe the magnetic flux density gradient can be determined in one direction.

Magnetic Polarization

The Magnetic Polarization J is the balance between Magnetic Flux Density in material and Magnetic Flux Density in vacuum. It represents the contribution of the material to the total amount of Magnetic Flux Density.
The J(H) hysteresis characterizes the response of magnetic material when exposed to an external magnetic field. Important measuring parameters are Maximum Magnetic Saturation, Remanence, Coercive Field Strength and Permeability. The core loss can be determined from the area surrounded by the hysteresis loop.


With KOERZIMAT HCJ and J-H upgrade module all these parameters can be determined precisely.