ANALYSIS OF THE PROPAGATION MODES OF ACOUSTIC-WAVES IN PIEZOELECTRIC DEVICES IN SYNCHROTRON WHITE-BEAM TOPOGRAPHS BY MEANS OF SIMULATIONS

The propagation modes of ultra-acoustic waves in quartz planar resonat ors with different elliptical electrodes have been studied by means of white-beam X-ray topographs. The contrast is explained on the basis o f thickness vibration modes and the validity and limits of this model are verified by means of simulation of the Xray images. The shape of t he fringes is correct but other features are not observed in the simul ations. The differences may be explained by the interaction with the w ires connecting the electrodes to the frequency generator and a slight angle between the upper and lower surfaces not taken into considerati on in the theory.