Abstract
Acoustic microscopes employ electromagnetic signals and transform them into acoustic waves by means of a piezoelectric transducer. The resultant acoustic waves are the same propagating elastic type as water waves in the ocean and sound waves in air.(1–8) Being of very high or ultrahigh frequency, 100–2000 megacycles/sec or megahertz (MHz), microscopical acoustic waves are ultrasonic (they cannot be heard). As in macroscopical use of ultrasound,(7) the primary significance is that such acoustic waves are reflected or deflected by the specimen’s variations in density or stiffness rather than by differential refraction, absorption, or reflection (as with light or electrons). Consequently a whole new microscopical area of structural information is open for correlation with properties or behavior and composition or treatment. Much of the contrast with acoustic microscopes is due to variation in the material’s elastic constants. With light microscopy however much of the contrast is due to variation in dielectric constants. Therefore acoustic microscopy complements light microscopy.
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Rochow, T.G., Tucker, P.A. (1994). Acoustic Microscopy. In: Introduction to Microscopy by Means of Light, Electrons, X Rays, or Acoustics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-1513-9_18
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DOI: https://doi.org/10.1007/978-1-4899-1513-9_18
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