Acoustic waves of the near ultrasonic range (frequencies of 20—100 kHz) are able to propagate in the air along several meters and therefore are widely used in practice:
- in parking sensors;
- in alarms;
- for foam suppression;
- in animal and insect repellents;
- … etc.
The short wavelength (from several millimeters to centimeters) allows the use of relatively compact sources emitting directed wave beams.
Currently, a promising type of ultrasound sources are arrays consisting of a large number of piezoelectric elements. However, a sufficiently powerful multi-element ultrasonic array has not yet been designed to allow manipulation of objects weighing up to 0.1 g in the air.
LIMU tasks
- Development of specialized transducers for high-intensity focused ultrasound (HIFU) in air
- Experimental and numerical characterization of the developed transducers
Activity types
- experiments
- numerical modeling
- transducer design
Contacts
Details
[1] A multielement low-frequency ultrasonic transducer as a source of high-intensity focused ultrasound in air / Asfandiyarov S. A., Tsysar S. A., Sapozhnikov O. A. // Acoustical Physics. — 2024. — Vol. 70, no. 4. — P. 759–768. DOI: 10.1134/S1063771024601936
[2] Power Ultrasonics. Applications of High-Intensity Ultrasound. 2nd Edition / Editors: J. A. Gallego-Juarez, K. F. Graff, M. Lucas // Woodhead Publishing. 2023. eBook ISBN: 9780323851442. Paperback ISBN: 9780128202548.
[3] Parametric array in air / M.B. Bennett, D. T. Blackstock // J. Acoust. Soc. Am. 57, 562–568 (1975) DOI: 10.1121/1.380484
[4] TinyLev: A multi-emitter single-axis acoustic levitator // A. Marzo, A. Barnes, B. W. Drinkwater // Rev. Sci. Instrum. 88, 085105 (2017) DOI: 10.1063/1.4989995