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7 问:什么叫涡流试验相似律?答:在讨论检测线圈阻抗图时,已知道了两个参数,一个是填充系数η=a~2/b~2(a——试件半径;b——线圈半径);另一个是频率比 fif_k(f——工作频率;f_a——试件界限频率)。并且,由阻抗图可看出,在相同填充系数的阻抗曲线上,检测线圈的归一化阻抗值(阻抗曲线上的位置)仅由频率比 fif_k 的大小决定。
Q: What is the similarity law of eddy current test? A: In discussing the detection of coil impedance diagram, two parameters are known, one is the filling factor η = a ~ 2 / b ~ 2 (a - radius of the specimen; b- - coil radius); the other is the frequency ratio fif_k (f - operating frequency; f_a - specimen boundary frequency). And, from the impedance diagram, it can be seen that the normalized impedance value of the detecting coil (the position on the impedance curve) is only determined by the frequency ratio fif_k on the impedance curve of the same filling factor.