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管道导波检测中激发频率的选择及灵敏度分析
王尚岱
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管道导波检测中激发频率的选择及灵敏度分析
采用超声纵向导波对热交换管进行检测。首先利用导波的频散曲线，选定了检测的最佳导波模式I(O,2)，然后用位移分布、应力分布及总能量密度分布等选取了用该模式检测特定管道的频厚积，最后通过试验分析了管道导波检测的灵敏度。试验结果表明，L(O，2)模式的波长比缺陷尺寸大10倍时，也能非常清楚地检测到缺陷。
The heat-exchanger pipes could be inspected by ultrasonic longitudinal guided waves．Firstly the optimal testing mode L(O，2)was selected according to the dispersion curves of guided waves，then the frequencythickness product was chosen according t0 the displacement，stress and total energy density(TED)amplitude distributions．Finally，the sensitivity of testing was analyzed in the experiment．Results showed that the defects inpipes could be detected distinctly even if the wavelength of L(O，2)mode was 10 times longer than the defect size．
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