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 mat erials has been studied using the time structure of synchrotron X-ray beam. A precise state of vibration may be frozen in a stroboscopic top ograph. The analysis of such images may be difficult since crystal def ects induce highly contrasted areas which mask interesting details. Nu merical image treatment give very efficient solutions to extract this ''hidden'' information. Fourier filtering is one of the methods and ha s been applied to the topographs, to study the interaction of the defe cts with the acoustic waves.