Enhanced Magneto-optic Imaging Based on LSTM-CNN Model and Multi-modal Fusion

Magneto-optic imaging technology is an optical means to detect metal defects. This category of technology will become particularly important in the widely developed precision industry. In this study, an alternating magnetic field is used to form a leakage magnetic field through a metal plate with defects. The leakage magnetic field passes through the Faraday effect magneto-optic device to generate polarization in the optical path. When the linearly polarized light passing through the device, the image with various manipulated metal plate defect characteristics can be displayed in the CCD. By using AC magnetic field could add time-dependence of the training data based on the CCD images. Based on LSTM-CNN model and multi-modal fusion technique, a precise prediction on the defects of metal could be made.