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Abstract
We report a single transducer acoustic levitator capable of manipulating objects in two-dimensions. The levitator consists of a centrally actuated vibrating plate and a flat reflector. We show that the levitation position of the object depends not only on the vibration frequency, but also on the tilting angle between the plate and the reflector. Additionally, new levitation positions can be created by actuating the plate with a composite signal of two frequencies using frequency switching. Based on recorded levitation positions, such single transducer acoustic levitator can manipulate a cluster of levitated microspheres in predefined trajectories, with mean position error of 155 ± 84 µm.
Highlights
Acoustic manipulation is a material-independent method having a broad range of biomedical and material applications [1,2,3,4]
Acoustic manipulation can be achieved using techniques such as contact force [5,6,7], streaming [8,9,10], and radiation force [11,12,13]. The latter gives rise to acoustic levitation that can suspend objects in the mid-air and has attracted wide interests
To achieve high spatial resolution, we set the mesh to be finer in the center region, where the levitation position is expected to occur
Summary
Acoustic manipulation is a material-independent method having a broad range of biomedical and material applications [1,2,3,4]. If the force is strong enough to overcome the gravitational force, the object will be levitated and trapped around the pressure node, referred to as the acoustic trap. To the best of our knowledge, this is the first work showing a single transducer acoustic levitator able to manipulate an object in 2D trajectory by solely controlling the actuation signal.
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