The nonlinear behavior of a 20.3 kHz single-axis acoustic levitator formed by a Langevin transducer with a concave radiating surface and a concave reflector is experimentally investigated. In this study, a laser Doppler vibrometer is applied to measure the nonlinear sound field in the air gap between the transducer and the reflector. Additionally, an electronic balance is used in the measurement of the acoustic radiation force on the reflector as a function of the distance between the transducer and the reflector. The experimental results show some effects that cannot be described by the linear acoustic theory, such as the jump phenomenon, harmonic generation, and the hysteresis effect. The influence of these nonlinear effects on the acoustic levitation of small particles is discussed.
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April 2014
Research Article|
April 30 2014
Nonlinear characterization of a single-axis acoustic levitator
Marco A. B. Andrade;
Marco A. B. Andrade
1Institute of Physics,
University of São Paulo
, São Paulo, Brazil
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Tiago S. Ramos;
Tiago S. Ramos
2Department of Mechatronics and Mechanical Systems Engineering, Escola Politécnica,
University of São Paulo
, São Paulo, Brazil
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Fábio T. A. Okina;
Fábio T. A. Okina
2Department of Mechatronics and Mechanical Systems Engineering, Escola Politécnica,
University of São Paulo
, São Paulo, Brazil
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Julio C. Adamowski
Julio C. Adamowski
2Department of Mechatronics and Mechanical Systems Engineering, Escola Politécnica,
University of São Paulo
, São Paulo, Brazil
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Rev. Sci. Instrum. 85, 045125 (2014)
Article history
Received:
February 10 2014
Accepted:
April 11 2014
Citation
Marco A. B. Andrade, Tiago S. Ramos, Fábio T. A. Okina, Julio C. Adamowski; Nonlinear characterization of a single-axis acoustic levitator. Rev. Sci. Instrum. 1 April 2014; 85 (4): 045125. https://doi.org/10.1063/1.4872356
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