" ASTM Acoustic Emission Standards, Figure 5
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Figure 5

Planar (2-D) Source Location Example. AE source (e.g., crack) is at the center of the concentric circles. Circles depict the traveling AE wave. Note that sensor 5 (closest to source) is first to detect the AE signal, followed by sensor 4 and then 8. Using this time difference of arrival information, the source can be located.

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