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Damage detection in pipes based on acoustic excitations using laser-induced plasma

机译:基于声激发的激光诱导等离子体在管道中的损伤检测

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摘要

A health-monitoring system is proposed to detect holes drilled in a pipe based on laser plasma acoustic excitations and acoustic measurements. In this system, an acoustic excitation is applied to a pipe via a laser-induced plasma in air generated by a high-power Nd: YAG pulse laser. Laser-induced plasmas can realize non-contact acoustic impulse excitations. A microphone is used to measure the time response of the acoustic pressure. In this study, we focus on the detection of a hole in the pipe. The reflection of the acoustic wave due to a hole drilled in the pipe induces a change in the time response of the acoustic pressure. Applying a continuous wavelet transform to the measured time response data with/without the hole can locate the position of the hole. This study demonstrates the effectiveness of the present damage detection method based on an acoustic excitation using a laser-induced plasma.
机译:提出了一种健康监测系统,以基于激光等离子体声激发和声学测量来检测在管道中钻的孔。在该系统中,通过大功率Nd:YAG脉冲激光产生的空气中的激光感应等离子体将声激发施加到管道上。激光诱导的等离子体可以实现非接触声脉冲激励。麦克风用于测量声压的时间响应。在这项研究中,我们专注于检测管道中的孔。由于在管道中钻了一个孔而引起的声波反射引起声压时间响应的变化。在有孔或无孔的情况下,将连续小波变换应用于所测得的时间响应数据,可以确定孔的位置。这项研究证明了基于使用激光诱导等离子体的声激发的本损伤检测方法的有效性。

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