实验中，采用了一发一收法，并分别激励了对称模态s1和反对称模态A 1对该缺陷进行了检测。

In the experiments, the symmetric and antisymmetric modes, S1 and A1, were excited to detect hidden corrosion defect respectively using pitch-catch technique.

youdao

实验中，采用了一发一收法，并分别激励了对称模态s1和反对称模态A 1对该缺陷进行了检测。

In the experiments, the symmetric and antisymmetric modes, S1 and A1, were excited to detect hidden corrosion defect respectively using pitch-catch technique.

youdao