Researches of Flaw Magnetic Field Signal in Alternating Current Field Measurement Technique

Relationships of flaw disfigurement characteristic and disturbing magnetic field distribution were studies based on experimentation and finite element simulations. Mechanism about magnetic field signal size inversion in alternating current field measurement(ACFM) was concluded. According to the comparability of disturbing magnetic field signal form and flaw characteristic, the 2-D inversion algorism of surface flaw was presented.