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SINGLE-TRANSDUCER ACOUSTIC LEVITATOR WITH EQUIDISTANT VERTICAL POSITIONING CAPABILITY

Schwiewer, Freya and Wang, Han and Unger, Alexander and Stefanova, Nataliya and Kupnik, Mario (2016):
SINGLE-TRANSDUCER ACOUSTIC LEVITATOR WITH EQUIDISTANT VERTICAL POSITIONING CAPABILITY.
In: IEEE IUS 2016, Tours, France, 18.09.2016 - 21.09.2016, [Conference or Workshop Item]

Abstract

We present an acoustic levitator experiment in air, in which objects can be vertically positioned to several equidistant locations. The setup consists of only one single-element transducer and one reflector. The main objective of this work was to investigate whether it is possible to move and position an object vertically in such a setup with only one narrowband single- element transducer and only one reflector, without moving the transducer or reflector at all. The key idea is that we exploit gravity to let the object fall from one pressure nodal node to one at a lower position. This is achieved by amplitude modulation of the transducers driving signal with varying gap times in order to match the free-fall time of the levitated object from one nodal plane to one of the nodal planes below. The levitator is able to generate sound pressure levels of up to 163 dB SPL, and, thus, capable of levitating lightweight objects over longer distances of several centimeters and high density samples such as water drops, glass or steel spheres over shorter distances. Our results prove that the levitated objects can be precisely and reproducibly transported from a higher pressure nodal plane to the next lower nodal plane position.

Item Type: Conference or Workshop Item
Erschienen: 2016
Creators: Schwiewer, Freya and Wang, Han and Unger, Alexander and Stefanova, Nataliya and Kupnik, Mario
Title: SINGLE-TRANSDUCER ACOUSTIC LEVITATOR WITH EQUIDISTANT VERTICAL POSITIONING CAPABILITY
Language: English
Abstract:

We present an acoustic levitator experiment in air, in which objects can be vertically positioned to several equidistant locations. The setup consists of only one single-element transducer and one reflector. The main objective of this work was to investigate whether it is possible to move and position an object vertically in such a setup with only one narrowband single- element transducer and only one reflector, without moving the transducer or reflector at all. The key idea is that we exploit gravity to let the object fall from one pressure nodal node to one at a lower position. This is achieved by amplitude modulation of the transducers driving signal with varying gap times in order to match the free-fall time of the levitated object from one nodal plane to one of the nodal planes below. The levitator is able to generate sound pressure levels of up to 163 dB SPL, and, thus, capable of levitating lightweight objects over longer distances of several centimeters and high density samples such as water drops, glass or steel spheres over shorter distances. Our results prove that the levitated objects can be precisely and reproducibly transported from a higher pressure nodal plane to the next lower nodal plane position.

Uncontrolled Keywords: Acoustic levitator, acoustic tweezing in air, Mason horn, liquid sample mixing in air, particle manipulation, high sound pressure levels
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design > Measurement and Sensor Technology
18 Department of Electrical Engineering and Information Technology
Event Title: IEEE IUS 2016
Event Location: Tours, France
Event Dates: 18.09.2016 - 21.09.2016
Date Deposited: 27 Sep 2016 15:54
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