ANALYSIS OF ACOUSTIC FIELD IN LIQUID RADIATED BY DISPERSIVE SURFACE-ACOUSTIC-WAVE TRANSDUCER

We obtained images of the acoustic field radiated from a dispersive su rface acoustic wave (SAW) device by numerical calculation and by exper iment in order to control the field by varying the frequency. First, a numerical calculation using Smith's equivalent circuit taking loss in to account was carried out. Then we produced a transducer using a disp ersive SAW device driven in liquid. We made an experiment using the tr ansducer and visualized the radiated acoustic field by the Schlieren m ethod to confirm the validity of the calculation method. The transduce r can be used to scan radiating positions over a distance of 9 mm for driving frequencies in the range of 1.5-2.5 MHz. The numerical results agree well with the experimental ones.