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首页> 外文会议>3rd International Workshop on Structural Health Monitoring, Sep 12-14, 2001, Stanford University >Localization of Acoustic Emission Signals in a Fatigue Specimen Using Laser Ultrasonics
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Localization of Acoustic Emission Signals in a Fatigue Specimen Using Laser Ultrasonics

机译：使用激光超声在疲劳标本中声发射信号的定位

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摘要

The geometry of a test specimen changes a measured acoustic emission waveform because of reflection, transmission and mode conversion at the interfaces and boundaries of the specimen, thus making it difficult to determine the location of a surface crack. This research develops a technique to identifiy the source location using measured acoustic emission signals. The signals are generated and detected with a repeatable, broad band acoustic emission source, a pulsed laser, and a broad band, high-fidelity sensor, a laser interferometer. The recorded signals are analyzed by wavelet transform in order to determine the arrival times of waves for several frequency levels. These arrival times are used to quantify the location of a propagating surface crack as well as the velocity of the most dominant feature, the Rayleigh wave, and the time lag between the signal generated by the crack and the recording of the signal. The accuracy of the method is demonstrated by comparing the identified source location with the exact one.
机译：由于在试样的界面和边界处的反射，透射和模式转换，试样的几何形状会改变测得的声发射波形，因此很难确定表面裂纹的位置。这项研究开发了一种使用测得的声发射信号来识别声源位置的技术。信号是通过可重复的宽带声发射源，脉冲激光器以及宽带，高保真传感器，激光干涉仪生成和检测的。通过小波变换对记录的信号进行分析，以便确定几个频率水平下的波到达时间。这些到达时间用于量化传播的表面裂纹的位置，以及最主要特征的速度，瑞利波以及裂纹产生的信号与信号记录之间的时间滞后。通过将识别出的源位置与精确位置进行比较，证明了该方法的准确性。

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