6. Fundamentals of Acoustic Emission
Presently, most acoustic emission applications in nondestructive testing involve placing transducers on a large structure, a bridge or hydrocarbon cracking pressure vessel, then loading the structure and listening for the burst-type acoustic emissions that ensue, and ,finally using triangulation to locate the flaws whence came those bursts. This technique is very effective at locating defects, and that means that the typical, most studied acoustic emission parameters are just the number of events, the event rate, and to a somewhat lesser extent, the maximum amplitude . It might be the root mean square. amplitude, or some other amplitude that characterizes the acoustic emission, or an amplitude distribution, that is, the number greater than some threshold V. These are typical, widely used acoustic emission parameters, and they have been very successful in locating defects. In fact, if they hadn't been, I don't think I would be here today talking about fancier things in acoustic emission.
Pardee, W. J., "Concept and Mathematical Modeling of Acoustic Emission Source" (1977). Proceedings of the ARPA/AFML Review of Progress in Quantitative NDE, July 1975–September 1976. 21.