SOUNDING FOR LOSSES IN SAW DEVICES USING PHOTOACOUSTIC TECHNIQUE

We report an experimental study of a new technique for localization of absorption areas of surface acoustic waves in devices utilizing SAW. The technique is based on a corollary of the fluctuation-dissipation t heorem. By this theorem, thermal radiation at the system output is for med by its components. We demonstrated experimentally that in such way it is possible to localize areas with a minimum SAW absorption of abo ut 0.1 dB with a spatial resolution of about 1 mm.