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http://dx.doi.org/10.9720/kseg.2015.4.587

Algorithm Development and Experimental Verification of Acoustic Emission First-arrival-time Determination for the Source Location  

Jang, Hyun-Sic (Department of Geophysics, Kangwon National University)
Choi, Jun-Young (Department of Geophysics, Kangwon National University)
Jang, Bo-An (Department of Geophysics, Kangwon National University)
Publication Information
The Journal of Engineering Geology / v.25, no.4, 2015 , pp. 587-598 More about this Journal
Abstract
We examined various existing threshold methods for the determination of the first arrival time of acoustic emission (AE), and developed a new variable threshold method that could determine the first arrival time of AE more accurately and more quickly than existing methods. The new method, a modification of an existing threshold method, does not fix the threshold, but applies variable thresholds for the AE signals according to noise analysis. Two- and three-dimensional models were established to test the effectiveness of the new method. It could determine source locations of AE in a two-dimensional model 38.3% more accurately than the pre-existing threshold methods. Its accuracy improvement over the existing methods in a three-dimensional model was about 15.2%. A practical test involved measuring the source locations of AE during three-point bending tests of granite cores. The new method placed the sources closer to the fracture plane than did the pre-existing methods, indicating its superior (and quicker) ability to determine the source locations of AE.
Keywords
acoustic emission (AE); first arrival time; variable threshold method; verification test;
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Times Cited By KSCI : 3  (Citation Analysis)
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