Presentation Information
[15p-PB2-61]Finite Element Analysis of the Leakage Magnetic Field for Defect Depth Estimation in Magneto-Optical Imaging
〇Natsuki Kamiya1, Ryosuke Hashimoto1 (1.NIT Suzuka College)
Keywords:
Magneto-Optical Imaging,Finite Element Analysis,Magnetic Field Sensor
Magneto-optical imaging utilizes the Faraday effect to convert the angle of polarization rotation into light intensity. It is used for nondestructive testing by visualizing the intensity distribution of magnetic fields. Understanding the relationship between defect depth and the magnetic field intensity distribution is important for quantitative estimation of defect depth using magneto-optical imaging. Magnetic garnet thin films are used as magnetic sensors in magneto-optical imaging. The thickness of magnetic garnet films is on the order of micrometers. However, the millimeter-scale spatial resolution of conventional magnetic field sensors makes it difficult to measure magnetic fields with micrometer-scale resolution. Therefore, quantitative measurement of the magnetic field distribution around thin films is difficult. Thus, the magnetic field intensity distribution was theoretically analyzed using the finite element method. As a result, the leakage magnetic field distribution was quantitatively evaluated depending on the defect depth.