The alternating current in the alternating current magnetic field leakage testing ( ac - mfl ) is one of the magnetizing manners . the sensitivity is very high to the defect of surface and the near to the surface of the workpiece . it is one of the developing directions of nondestructive testing ( ndt ) domain 交變漏磁檢測技術(shù)中的交變是漏磁檢測技術(shù)中的一種磁化方式,該技術(shù)對工件表面及近表面缺陷具有較高的檢測靈敏度,是無損檢測領(lǐng)域未來主要發(fā)展方向之一。