电磁导波激励脉冲群最佳重复频率确定

电磁导波检测技术因其非接触耦合的特性已被广泛应用于各种金属管道无损检测领域中,但导波的激励脉冲群重复频率的确定长久以来却没有一个有效的解决方法。为此,本文提出了以有、无缺陷的重复脉冲群检测信号的相关性作为判别标准,选取电磁导波激励脉冲群最佳重复频率,并从检测信号特征提取和识别的角度验证了本文选取的激励脉冲群最佳重复频率可有效提高导波检测信号之间的区分度,减小检测信号间的干扰,提高缺陷识别的准确性。

Determination on repetition frequency of electromagnetic guided wave excited by impulse cluster

As a result of contactless coupling,electromagnetic guided wave detection technology is used extensively to detect various metallic pipelines,however,it hasn’t achieved an effective solution about reception frequency of guided wave exciting impulse cluster.So,in this paper,the correlation between flaw detection signal from repetition impulse cluster and no defect is proposed as criterion to choose optimal repetition frequency of exciting impulse cluster,through feature extraction and identification of testing signal,which is prove that it can improve efficiently discrimination degree of guided wave signals,decrease noise jamming,and advance precision of defect identification.