Scanning acoustic microscopy is a novel method of non-destructive examination enabling images to be formed which show elastic property variations on a microscopic scale. This ability is unique and accounts for the rapid growth of interest in the technique. The instruments can be used for (‘seeing through’, and detecting faults within, samples several millimetres thick. Alternatively, contrast can be obtained from layers only a few micrometres thick, and very narrow (< 100 nm) cracks and discontinuities can be distinguished.
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