Devices and methods for determining a magnetic field

A method for inspecting permanent magnets or magnet assemblies by determining a magnetic vector field in a predetermined area, said method comprising:

• placing a magnetic field camera in close vicinity of a permanent magnet or magnet assembly;
• determining distribution data comprising values of a first of three components of a magnetic vector field along a first direction, for a predetermined area defined on a predetermined surface by measuring measurement values of said first component by means of the magnetic field camera, said predetermined surface being defined by a second and a third direction, wherein said first, second and third directions constitute an orthogonal set of axes;
• determining distribution data comprising values of the second and the third component of said magnetic vector field in said second and said third direction respectively, for said predetermined area defined in said predetermined surface;
• wherein determining distribution data comprising values of the second and the third component is based on making use of intrinsic physical relations between the first, second and third components of said magnetic vector field.