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- W2091296685 abstract "Acoustic microscopy has been used recently for nondestructive thickness measurements of surface layers. The approach is based upon the thickness dependence of the surface wave velocity in a layered medium. Using an acoustic material signature from a focused beam microscopy as described in the literature, one can determine the surface-wave velocity. This technique also has the potential of providing information on coating defects and surface adhesion. An experimental facility is being established at LLNL for the characterization of the relatively thick coatings that are protecting surfaces from corrosion and erosion. Thicknesses in the range of 0.01 to 0.25-mm require an operating frequency between 5 and 200-MHz. An experimental system capable of operation at discrete frequencies between these limits has been constructed and initially used to obtain the acoustic material signature of aluminum on beryllium from which we deduce the surface wave velocity. This measured velocity compares favorably with calculated results." @default.
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- W2091296685 date "1981-01-01" @default.
- W2091296685 modified "2023-10-18" @default.
- W2091296685 title "An Acoustic Microscope for Surface Characterization" @default.
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- W2091296685 doi "https://doi.org/10.1109/ultsym.1981.197684" @default.
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