Velocity, acoustic Rayleigh wave 86 9 ,

Consider a semiconductor film placed in the fringe field that exists above a piezoelectric crystal such as LiNbOj, which carries a surface acoustic Rayleigh wave. The geometry is shown in Fig. 16. One can use the quasistatic approximation for the traveling wave because the wave travels with the sound velocity which is nearly static when compared with the light veloc-... 

Anyone who has successfully used a microscope to image properties to which it is sensitive will sooner or later find himself wanting to be able to measure those properties with the spatial resolution which that microscope affords. Since an acoustic microscope images the elastic properties of a specimen, it must be possible to use it to measure elastic properties both as a measurement technique in its own right and also in order to interpret quantitatively the contrast in images. It emerged from contrast theory that the form of V(z) could be calculated from the reflectance function of a specimen, and also that the periodicity and decay of oscillations in V(z) can be directly related to the velocity and attenuation of Rayleigh waves. Both of these observations can be inverted in order to deduce elastic properties from measured V(z). 

Surface acoustic wave (SAW) detection involves monitoring the attenuation and changes in velocity of surface sound waves (Rayleigh) in response to the evolution of crystalline size [95Clal]. 

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