Alternating current field measurement(ACFM)technology is widely used in defect detection of metal structures in the fields of marine equipment and manufacturing industry. Aiming at the problems of angle deflection and crack localization in the process of single sensor detection are studied. Firstly,the simulation results of COMSOL multiphysics show that Bx and By has complementary law in the process of multi-angle deflection,and then high-precision numerical fitting is achieved by establishing scale factor. In addition,the deflection crack reconstruction is realized by multi-gradient deflection simulation. Finally,the rationality of the fitting law is verified by building experimental platform and signal feature extraction;by optimizing the fitting formula,the detection precision is improved. Through the measured angle,the deflection problem of the reconstructed crack image in the non-parallel detection process is solved.
关键词
交变电磁场测量/角度偏转/重构/比例因子/数值拟合
Key words
alternating current field measurement (ACFM )/angular deflection/reconstruction/scale factor/numerical fitting
维普
万方数据