A possibility of sustaining a stable 3D-levitation of a collection of particles in an acoustic field under the conditions of all-around irradiation by monochromatic ultrasonic waves in air is investigated. The levitation of particles is ensured by placing them into a field of standing waves of a particular configuration. The particles are controlled in the field in the horizontal plane by varying the phase relations of the radiating arrays. It is shown theoretically and experimentally that it is possible to apply a monochromatic field to sustain a stable levitation of particles in a volume. A multiple-channel system of control over the phased arrays of ultrasonic vibrators is shown, which is based on a 1-bit DA-converter for application in a facility of ultrasonic levitation in air.

中文翻译：

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超声波振子相控阵场中粒子的三维声悬浮

研究了在空气中单色超声波全方位辐照条件下，在声场中维持粒子集合稳定 3D 悬浮的可能性。通过将粒子置于特定配置的驻波场中来确保粒子的悬浮。通过改变辐射阵列的相位关系来控制水平面场中的粒子。理论和实验表明，可以应用单色场来维持体积中粒子的稳定悬浮。显示了控制超声波振动器相控阵的多通道系统，该系统基于 1 位 DA 转换器，用于在空气中的超声波悬浮设施中的应用。