Use of image treatment for the understanding of the influence of crystal defects in piezoelectric materials

The propagation of surface or bulk acoustic waves in piezoelectric materials has been studied using the time structure of synchrotron X-ray beam. A precise state of vibration may be frozen in a stroboscopic topograph. The analysis of such images may be difficult since crystal defects induce highly contrasted areas which mask interesting details. Numerical image treatment give very efficient solutions to extract this "hidden" information. Fourier filtering is one of the methods and has been applied to the topographs, to study the interaction of the defects with the acoustic waves