Detection and location of the source of acoustic emission in a thin aluminum panel is demonstrated using a multichannel fiber laser sensor system. Acoustic emission generated by a crack in an aluminum panel used as a test coupon in an accelerated fatigue experiment is detected and the location of the crack identified. Acoustic emission is detected over a bandwidth of around 0.5 MHz from a serially multiplexed array of four laser sensors and compared with measurements taken from four piezo-electric sensors co-located with the fiber laser sensors. The location of the crack is determined by first estimating time difference of arrival of signals at each sensor using a novel algorithm based on the cumulative distribution transform method with hyperbolic positioning. The fiber laser sensor is shown to match the signal-to-noise ratio of the industry standard (Mistras S9225) piezo-electric acoustic emission sensor.

中文翻译：

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用于铝板加速疲劳测试中裂纹检测和定位的多通道光纤激光声发射传感器系统

使用多通道光纤激光传感器系统演示了铝薄板中声发射源的检测和定位。检测在加速疲劳实验中用作测试样板的铝面板中的裂纹产生的声发射，并确定裂纹的位置。从四个激光传感器的串行多路复用阵列在约0.5 MHz的带宽上检测到声发射，并将其与从与光纤激光传感器共置的四个压电传感器获得的测量结果进行比较。裂纹的位置是通过使用基于双曲线定位的累积分布变换方法的新颖算法，首先估计每个传感器信号到达的时间差来确定的。