Development of Longitudinal Kerr Imaging System for mm-Order Domain Observation

为满足永磁材料等国家战略材料的发展和薄磁带的发展以减轻环境负荷，基于纵向克尔效应成功实现了一种用于毫米级磁畴观测的照相成像装置。该系统具有有效孔径。通过使用焦距为125 mm（FL）的大中继透镜、有效直径为125 mm的物镜透镜和有效直径为15 mm的物镜，实现了15 mm的高分辨率成像。50 mm，FL 75 mm，偏转角度8 °的电流扫描仪。该系统实现了对带卷铁心电力Transformer的时间分辨时域磁矩方向观测。

For the development of national strategy materials including permanent magnet and for that of thin magnetic ribbons to reduce environment load, a photographic imaging equipment for mm-order magnetic domain observation was successfully realized based on longitudinal Kerr effect. This system has an effective aperture dia. of 15 mm by using large relay lens with focal length of 125 mm (FL), objective lens with effective dia. of 50 mm and FL of 75 mm, and galvano-scanner with deflection angle of 8 deg. This system has enabled the time-resolved domain observation with magnetic moment direction for a power transformer with tape-wound core.