Browsing by Subject "Scanning acoustic microscope"
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Item Open Access Characterization and imaging of single layered materials by the Lamb wave lens(1991) Değertekin, F. LeventThe Lamb wave lens, which was introduced earlier as a new kind of lens for scanning acoustic microscope, is analyzed theoretically. A simulation program capable of handling single layered materials with different material parameters and bonding conditions is developed. The validity of theory is investigated by comparing the simulation results with the experimented ones for speciidly prepared samples. Parameter sensitivity of V{f) curves are used to test the characterization ability of the lens in layered materials. Sul)surface imaging ability of the Lamb wave lens is also investigated by forming amplitude and peak frequency images of some samples.Item Open Access High efficiency Lamb wave lens for subsurface imaging(IEEE, 1989-10) Atalar, Abdullah; Köymen, HayrettinA conventional scanning acoustic microscope lens excites all the possible modes of acoustic waves in the solid structure under examination. The excited leaky modes contribute significantly to the high contrast obtained in the images, but because all such modes exist simultaneously, the interpretation of the images is not straightforward. A new lens geometry that can be used with acoustic microscopes to image layered solid structures is proposed. This new lens can efficiently focus the acoustic waves in only one of the Lamb wave modes of the layered solid. The images obtained are easy to interpret, and the subsurface sensitivity is high.Item Open Access A high performance acoustic microscope - technical aspects and selected applications(Springer, Boston, MA, 1986-07) Atalar, Abdullah; Hoppe, M.Technical aspects of a scanning acoustic microscope with broad frequency coverage (50…2000 MHz) are described. Images demonstrating the capabilities of the microscope are shown.