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A coherent laser probe provides the basis for the recording of complex SAW distributions. Using three or more scans, the surface wave velocity can be deducep with an accuracy of a few parts in 10 5 • Such measurements are sufficiently sensitive to detect small changes in surface characteristics; as an example, results will be presented on the effect of(More)
A phase sensitive laser probe in which the focussed spot is small, as compared with the acoustic wavelength, is capable of measuring the complex distributions of a SAW field along prescribed scan lines. Using the probe, it is possible, on a defect free sample, to measure the SAW velocity surface with an accuracy of a few parts in 10s. Such accuracy suggests(More)
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