An effective method for laboratory acoustic emission detection and location using template matching
An effective method for laboratory acoustic emission detection and location using template matching
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DOI：
10.1016/j.jrmge.2022.03.010
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发表时间：
2022-09-27
影响因子：
7.3
通讯作者：
Li, Qi
中科院分区：
文献类型：
--
作者：
Lei, Xinglin;Ohuchi, Tomohiro;Li, Qi
本文将近年来在微震研究中迅速应用的模板匹配定位方法应用于实验室声发射监测。首先，利用传统方法探测纵波初动，在三维空间定位声发射震源。此外，我们选择定位精度足够的事件作为模板事件（通常对应的AE事件能量相对较大，在大多数通道表现出清晰的p波第一运动和较高的信噪比）。然后，使用模板事件扫描和匹配触发事件记录中其他定位不佳的事件或连续记录中的弱事件。通过模板与待检测事件之间的多通道波形互相关，采用网格搜索算法（网格以模板震源为中心）检测并定位弱信号。为了检验该方法的性能，我们使用不同岩石和不同类型的实验数据对所提出的方法进行了校准。结果表明，该方法可显著提高检测能力和定位精度，适用于各种多通道声发射监测的实验室和现场实验，波形记录可为触发模式或连续模式。(C) 2022中国科学院岩土力学研究所；制作和托管由爱思唯尔B.V.
In this paper, a template matching and location method, which has been rapidly adopted in microseismic research in recent years, is applied to laboratory acoustic emission (AE) monitoring. First, we used traditional methods to detect P-wave first motions and locate AE hypocenters in three dimensions. In addition, we selected events located with sufficient accuracy (normally corresponding AE events of relatively larger energy, showing clear P-wave first motion and a higher signal-to-noise ratio in most channels) as template events. Then, the template events were used to scan and match other poorly located events in triggered event records or weak events in continuous records. Through cross-correlation of the multi-channel waveforms between the template and the event to be detected, the weak signal was detected and located using a grid-searching algorithm (with the grid centered at the template hypocenter). In order to examine the performance of the approach, we calibrated the proposed method using experimental data of different rocks and different types of experiments. The results show that the proposed method can significantly improve the detection capability and location accuracy, and can be applied to various laboratory and in situ experiments, which use multi-channel AE monitoring with waveforms recorded in either triggering or continuous mode. (C) 2022 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V.