| 摘要 |
This electron gun abnormality detection device (1) detects abnormalities in an electron gun (3) of a magnetic domain segmentation device (2) for a magnetic steel sheet, said device being provided with a plurality of electron guns (3a, 3b, 3c, 3d). The electron gun abnormality detection device (1) is provided with: a magneto-optic element (5) that comes into contact with and separates from inspection areas (R1, R2, R3), which are established in such a manner as to include the boundaries of magnetic domain discontinuity sections (L) that occur as a result of the surface of the magnetic steel sheet being exposed to electron beams from the plurality of electron guns (3a, 3b, 3c, 3d), and is capable of detecting, as optical characteristics, magnetic domain structures of the steel sheet (S) in the inspection areas (R1, R2, R3); a light source (7) that projects linearly polarized light on the magneto-optical element; and a detector (12) that detects polarized light that has been rotated by the magnetic domain structures of the steel sheet (S), which has been transferred to the magneto-optical element (5). |
