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实验研究了基于磁致伸缩效应的超声导波技术在实际管道检测中的检测能力。在实验过程中传感器与管道之间采用机械干耦合方式,控制传感器单向激励低频T(0,1)模态超声导波。对一根长9.6m的管道试样进行实验,激励的T(0,1)模态超声导波在管道中传播153.6m后,管道端面回波信号仍然具有高信噪比。对两段现场蒸汽管道的检测实验,得出单向激励64kHz,T(0,1)模态超声导波能够检测到13m管道长度内的焊缝、支架、弯头等管道典型结构并且位置误差小于150mm。
Experimental study of the detection of ultrasonic guided wave technology based on magnetostriction effect in the actual pipeline testing. During the experiment, a mechanical dry coupling method is used between the sensor and the pipeline to control the sensor to unidirectionally stimulate the low-frequency T (0,1) modal ultrasonic guided wave. Experiment on a pipe sample with a length of 9.6m, the excited T (0,1) mode ultrasonic guided wave propagating in the pipe after 153.6m, the pipe end echo signal still has a high signal-to-noise ratio. The experimental results of two on-site steam pipes show that the uniaxial excitation of 64 kHz and T (0,1) mode ultrasonic guided waves can detect the typical structure of the pipes, brackets, elbows and other pipes within the length of 13 m and the position error is less than 150mm.