AUTHOR=Kong Qingxiao , Pan Shuwei , Lin Lilong , Li Xinfeng TITLE=Classification, identification, and quantitative study of defects in aluminum plates using pulsed alternating current field measurement combined with principal component analysis JOURNAL=Frontiers in Materials VOLUME=Volume 12 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2025.1569055 DOI=10.3389/fmats.2025.1569055 ISSN=2296-8016