Deciphering the Scattering Code Contained in the Resonance Echoes from Fluid-Filled Cavities in Solids

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Science  05 Oct 1979:
Vol. 206, Issue 4414, pp. 61-64
DOI: 10.1126/science.206.4414.61


From the echoes of elastic waves incident on inclusions in solids, one may extract certain resonance features. These "spectral lines" and their widths form a code identifying the material composition of the inclusion in a way that resembles spectroscopy. This idea finds applications in geophysics, materials science, and any field dealing with materials containing inclusions.