A new acoustic levitation device using the interference sound field generated from two opposed radiators

Abstract

A new technique for acoustically levitating a specimen is described. The technique deviates from a previous single-axis acoustic levitation method that utilizes a single-acoustic radiator and a passive reflector to generate the interference produced sound field. The new method involves the use of two opposing focusing acoustic radiators that produce an interference field that has capabilities for the levitation and positioning of small objects or liquid drops. The theoretical predictions regarding this technique are examined and those results are compared with laboratory measurements. The nature of the apparatus and its capabilities is also addressed. [Work supported by NASA.]