[摘要]：We present herein a method for the acoustic translation of solid particles of waterlike density in air, by employing a single transducer and controlling the pressure field through regulation of the distance between the reflector and the radiating plate. The levitation and translation of polystyrene particles over a length of 37 mm (approximately 37 particle diameters) were experimentally demonstrated, numerically modeled, and explained. The results of the model show quantitatively how the acoustic pressure distribution inside the levitator chamber and the position of the potential nodes depend on the distance between reflector and radiating plate when the plate is driven in a flexural resonance mode. This phenomenon significantly extends the range of applications of acoustic levitation. (C) 2010 American Institute of Physics. [doi:10.1063/1.3504191]
