Acoustic Microscopy Via Scanning

We offer via posters some of the latest images recorded with the scanning acoustic microscope operating near 2.5 GHz. Our report at the 1978 Review included a description of the scanning instrument which had been scaled up in frequency to 3 GHz. This was accomplished in large part by fabricating acoustic lens with smaller radii and by heating the liquid to reduce the absorption. In our report for this year, we·will present the results of our material studies as carried out with the new instruments operating near 2.5 GHz. We will include results on four different materials - steel, Cobalt-Titanium, brass and alumina ceramic. Each of these have distinctive characteristics in the acoustic micrographs and each of these have information which is distinct from their optical counterparts