WAVEFORM ANALYSIS OF ACOUSTIC EMISSION IN CONCRETE.

In this paper some of the authors' recent research into acoustic emission (AE) is described. In searching for the source mechanisms of AE, the aim of waveform analysis may be to separate the effects of the propagation media and the transducers from the detected AE waveforms, and the determine the kinetic and kinematic characteristics of sources. Therefore, deconvolution techniques in both the time domain and the frequency domain are developed. They have been applied to investigate two basic types of sources, namely, a point force and a tensile crack. Results show that the authors' original notions concerning the source mechanisms of AE, which can be mathematically described by the dislocation model, are acceptable. The applicability of elastodynamics and the dislocation theory for studying the relation between the source mechanisms and wave motions of AE is also verified.