Semidefinite programming for manipulating acoustic traps in real time (SMART)
Sebastian Zehnter, Kevin Endres, Martin Kronbichler, Marco A. B. Andrade, Felix Funke, Christoph Ament
TL;DR
A new method using semidefinite programming allows real-time manipulation of objects using sound waves, enabling precise and fast control.
Contribution
The introduction of semidefinite programming for real-time acoustic manipulation enables dynamic control of levitated objects.
Findings
A phased array with 256 ultrasonic transducers was used to manipulate non-spherical and Mie spheres in real time.
The method determines emission phases in real time, facilitating model-based closed-loop control in acoustic levitation systems.
Abstract
Sound waves can be used for trapping and manipulating objects immersed in liquids or air. However, most acoustic levitation techniques are limited to particles with diameters much smaller than the acoustic wavelength or require time-consuming optimisation-based methods that hinder the dynamic manipulation of objects. Here, we present an approach based on semidefinite programming to manipulate levitated objects in real time. To demonstrate this technique, a phased array consisting of 256 ultrasonic transducers operating at 40 kHz is used for rotating a non-spherical Rayleigh object or to translate Mie spheres along various trajectories. In contrast to previous optimisation-based approaches, the proposed method can determine the emission phases of each transducer in real time, strongly facilitating the implementation of a model-based closed-loop control in future acoustic levitation…
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Taxonomy
TopicsMicrofluidic and Bio-sensing Technologies · Orbital Angular Momentum in Optics · Electrohydrodynamics and Fluid Dynamics