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The propagation modes of ultra-acoustic waves in quartz planar resonators have been studied by means of stroboscopic section topographs at ESRF. The images present a number of internal lines inside the section that allow a quantitative analysis of the vibration modes. When the excitation level increases, the shape of the lines enables the study of the dumping of the vibration along the surface of the device. Such analysis was made possible because of the small divergence of the white beam delivered by a third-generation synchrotron source.

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