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<p>[QUOTE=&quot;Suarez, post: 3380161, member: 99239&quot;]I think you misunderstood, Jim. It wasn&#039;t about the hammering process leaving wave-like imprints (or at least that&#039;s not where I was going with that). I meant using acoustic signature tools to give a mapping of the interior of the coin analogous to x-rays. A couple of different but related techniques are linked below for anyone interested.</p><p><br /></p><p><a href="https://en.wikipedia.org/wiki/Phased_array_ultrasonics" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Phased_array_ultrasonics" rel="nofollow">Phased array ultrasound</a></p><p><a href="https://en.wikipedia.org/wiki/Characterization_(materials_science)" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Characterization_(materials_science)" rel="nofollow">Nondestructive characterization</a></p><p><a href="http://www.nde-ed.org/EducationResources/CommunityCollege/Other%20Methods/AE/AE_Intro.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.nde-ed.org/EducationResources/CommunityCollege/Other%20Methods/AE/AE_Intro.htm" rel="nofollow">Acoustic wave emission detection</a>[/QUOTE]</p><p><br /></p>

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