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Nonscanning reflection acoustic microscopes can be satisfactorily applied to detect the anisotropy of acoustic properties of solid materials using a line-focus beam. As a demonstration, the anisotropic dependence of leaky surfac-acoustic-wave velocities on the propagation directions are measured on the water/Z-cut-sapphire boundary at a frequency of 200 MHz. The measured values are in good agreement...
A linearly focused acoustic beam is investigated to be introduced into acoustic microscopy for characterising materials in the nonscanning version. The new acoustic beam enables us to detect acoustic anisotropies of materials to be measured successfully. For forming the acoustic beam, an acoustic sapphire lens with a cylindrical concave surface of 1.0 mm in radius is made and the acoustic field distributions...
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