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SRAS: Spatially Resolved Acoustic Spectroscopy
We can use the O-SAM to map the SAW velocity in one or more directions, if we use a technique we have called spatially resolved acoustic spectroscopy (SRAS). This allows us to image micro- and macro-structure, probe coating thicknesses, and potentially image residual surface stress and porosity. The lateral resolution achievable is currently of the order of 50µm, and the velocity resolution of the order of 1ms-1.
More information is available at the SRAS for materials characterisation wiki page.