ACOUSTIC WAVE-GUIDING RODS WITH GRADED VELOCITY PROFILES

Experimental investigations of waveguiding in graded acoustic index ro ds are presented. These rods, made by ion-exchange and chemical vapour deposition methods, have graded acoustic velocity profiles in the rad ial direction that are shown to have an ability to focus acoustic wave s. Effects of different acoustic profiles on focusing behaviour are de monstrated. The focusing behaviour is visualized with a Schlieren syst em.