Crack Propagation Analysis Using Acoustic Emission Sensors for Structural Health Monitoring Systems
Figure 9
Example of test results for panel load to onset of crack extension. Each point on the plot is a single strain wave detected by either sensor 1 or 2. Although some measurements appear simultaneous in recording, there are microseconds between recordings.
(a) Acoustic emission detections from the entire experiment 
(b) Acoustic emission data during the crack extension