Diffuse elastic waves at a free surface. Weaver & L, R. J. Acoust. Soc. Am., 78(1):131--136, July, 1985.
Diffuse elastic waves at a free surface [link]Paper  doi  abstract   bibtex   
For a diffusely vibrating elastic body, the participation of the surface in the general disturbance is evaluated. It is shown that in the vicinity of a free surface a diffuse acoustic field may legitimately be regarded as a sum of incoherent isotropic and homogeneous independent plane waves incident upon the surface together with their respective outgoing reflected consequences. The work contributes to a conceptual basis for the study of acoustic emission signals on time scales large compared to acoustic travel times across the structure.
@article{ weaver_diffuse_1985,
  title = {Diffuse elastic waves at a free surface},
  volume = {78},
  url = {http://dx.doi.org/10.1121/1.392576},
  doi = {10.1121/1.392576},
  abstract = {For a diffusely vibrating elastic body, the participation of the surface in the general disturbance is evaluated. It is shown that in the vicinity of a free surface a diffuse acoustic field may legitimately be regarded as a sum of incoherent isotropic and homogeneous independent plane waves incident upon the surface together with their respective outgoing reflected consequences. The work contributes to a conceptual basis for the study of acoustic emission signals on time scales large compared to acoustic travel times across the structure.},
  number = {1},
  journal = {J. Acoust. Soc. Am.},
  author = {Weaver, Richard L},
  month = {July},
  year = {1985},
  keywords = {{MECHANICAL} {VIBRATIONS}, {SOUND} {FIELDS}, {SURFACES}, acoustic emission, elastic waves},
  pages = {131--136}
}

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