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Study on the Number and the Frequency Characteristic of Transducers in Pipe Inspection Using Guided Waves
Author(s): HE Cunfu, LIU Zenghua, ZHENG Zuo, WU Bin, WANG Xiuyan
Pages: 393-
397
Year: 2004
Issue:
4
Journal: JOURNAL OF BEIJING UNIVERSITY OF TECHNOLOGY
Keyword: 管道; 导波; 传感器; 反射回波; 激励频率;
Abstract: 为了有效地检测管道缺陷,使用PZT传感器在管道中激励并接收超声导波,采用轴对称激励接收的方法,通过多组实验研究了导波在一定频率范围内管道端部与缺陷的第1次反射回波的幅值大小与频率之间的关系,分析了传感器中探头个数对信号大小的影响,确定了激励导波的最佳频率范围.实验表明,反射回波幅值的大小与传感器的固有特性有关,有缺陷管道检测与无缺陷管道检测的最佳实验频率一致,可以考虑以无缺陷管道的最佳实验频率作为频率选择的参考.
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