介绍了接触电位差法固定探头式无损探伤装置的结构，工作原理，测量电路及其频率特性。
The structure, working principle, measuring circuit and frequency characteristics of contact potential difference nondestructive testing equipment using fixed probe am intro - duced.
本文比较详细地介绍了基于模态理论的无损探伤方法，即频率法、能量法、柔度矩阵法等。
In the paper, some non-destructive methods based on mode theory such as frequency method, energy method and matrix method are introduced.
本文比较详细地介绍了基于模态理论的无损探伤方法，即频率法、能量法、柔度矩阵法等。
In the paper, some non-destructive methods based on mode theory such as frequency method, energy method and matrix method are introduced.
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