Understanding Acoustic Emission Testing- Reading 1 Part B-A

They found that, while the number of acoustic events showed the progression
of damage both ahead and behind the crack front, this technique alone could
not provide a quantitative description of the cracking. However, using more
elaborate techniques, including amplitude analysis and measurements of
signal duration, Berthelot and Robert concluded that “acoustic emission
testing is practically the only technique which can provide a quantitative
description of the progression in real time of concrete damage within test
specimens.” Later, much more sophisticated signals processing techniques
were applied to acoustic emission analysis.
In 1981, Michaels et al.15 and Niwa et al. developed deconvolution
techniques 反 褶 积 技 术 to analyze acoustic waveforms, in order to provide a
stress-time history of the source of an acoustic event. Similar deconvolution
techniques were subsequently used by Maji and Shah to determine the
volume, orientation and type of microcrack, as well as the source of the
acoustic events. Such sophisticated techniques have the potential eventually
to be used to provide a detailed picture of the fracture processes occurring
within concrete specimens.
Charlie Chong/ Fion Zhang