Stanford Acoustic Emission Data set_waveforms
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The acoustic emission (AE) data set is from a triaxial compression test conducted in a triaxial loading vessel equipped with a network of AE sensors . In the compression test, a cylindrical Berea sandstone specimen (diameter: 25.14 mm; length: 49.45 mm) was increasingly loaded up to failure at an axial strain rate of 1.03×10-5 /s under a constant confining pressure of 5 MPa. During the axial loading process, AE waveforms were detected by ten PZT-5A compressional crystal sensors manufactured by Boston Piezo-Optics Inc. The setup uses an Elsys acquisition system to amplify, digitize and record the waveforms, which consists of an AE-Amp Pre-amplifier (model Amp-BU-20-AE) and a High-Speed Data Acquisition (model TranNET EPC) module. We set a 40 dB pre-amplification gain and 5 kHz – 2MHz bandpass filtering. The sampling rate of waveforms was 10 MHz. The time length of each waveform was 250 μs, comprising a pre-trigger length of 50 μs and a post-trigger length of 200 μs. Here, the term “trigger” refers to one channel of the AE system being activated once the acquired waveforms meet a triggering criterion set by the user. We set the trigger level at 0.5 V and the trigger mode to use the positive slope mode. After acquiring the AE data, we manually selected 49,212 waveforms containing P-wave arrival by using a P-wave arrival picking platform developed in-house.
本声学发射（Acoustic Emission，AE）数据集取自搭载声学发射传感器网络的三轴加载容器内开展的三轴压缩试验。试验采用圆柱形Berea砂岩试样（直径：25.14 mm；长度：49.45 mm），在围压恒定为5 MPa的条件下，以1.03×10⁻⁵ /s的轴向应变速率逐级加载直至试样发生破坏。轴向加载过程中，10台由Boston Piezo-Optics Inc.制造的PZT-5A压电晶体压缩传感器采集到了声学发射波形。试验采用Elsys采集系统对波形进行放大、数字化处理与记录，该系统包含AE-Amp前置放大器（型号为Amp-BU-20-AE）与高速数据采集（High-Speed Data Acquisition）模块（型号为TranNET EPC）。本次试验设置的前置放大增益为40 dB，带通滤波范围为5 kHz~2 MHz，波形采样率为10 MHz。单条波形的时长为250 μs，其中预触发时长为50 μs，后触发时长为200 μs。此处"触发"指当采集到的波形满足用户设定的触发判据时，声学发射系统的单通道即被激活。本次试验将触发电平设置为0.5 V，触发模式采用正斜率触发模式。完成声学发射数据采集后，研究人员依托自研的P波初至拾取平台，手动筛选出共计49212条包含P波初至的波形。
