Abstract: A steel sheet inspection device includes: a magnetooptic element that is able to detect, as an optical property, a magnetic domain structure of a steel sheet to be inspected; a light source that irradiates the magnetooptic element with linearly polarized light; a detector that detects the linearly polarized light with a polarization plane rotated according to the magnetic domain structure of the steel sheet transferred to the magnetooptic element; and a drive mechanism that drives at least the magnetooptic element so as to contact and separate the steel sheet and the magnetooptic element with and from each other.

Abstract: An electron gun abnormality detecting device for detecting an abnormality in first and second electron guns of a magnetic domain refining device for an electrical steel sheet includes: a magnetooptic element configured to contact with and separate from an inspection region set to include a boundary between a magnetic domain discontinuity generated by irradiation of a surface of the electrical steel sheet with an electron beam by the first electron gun and a magnetic domain discontinuity generated by irradiation thereof with an electron beam by the second electron gun, and configured to detect a steel sheet magnetic domain structure in the inspection region as an optical property; a light source configured to irradiate the magnetooptic element with linearly polarized light; and a detector configured to detect polarized light rotated by the steel sheet magnetic domain structure transferred to the magnetooptic element.

Abstract: A steel sheet inspection device includes: a magnetooptic element that is able to detect, as an optical property, a magnetic domain structure of a steel sheet to be inspected; a light source that irradiates the magnetooptic element with linearly polarized light; a detector that detects the linearly polarized light with a polarization plane rotated according to the magnetic domain structure of the steel sheet transferred to the magnetooptic element; and a drive mechanism that drives at least the magnetooptic element so as to contact and separate the steel sheet and the magnetooptic element with and from each other.

Abstract: An electron gun abnormality detecting device for detecting an abnormality in first and second electron guns of a magnetic domain refining device for an electrical steel sheet includes: a magnetooptic element configured to contact with and separate from an inspection region set to include a boundary between a magnetic domain discontinuity generated by irradiation of a surface of the electrical steel sheet with an electron beam by the first electron gun and a magnetic domain discontinuity generated by irradiation thereof with an electron beam by the second electron gun, and configured to detect a steel sheet magnetic domain structure in the inspection region as an optical property; a light source configured to irradiate the magnetooptic element with linearly polarized light; and a detector configured to detect polarized light rotated by the steel sheet magnetic domain structure transferred to the magnetooptic element.