Cylindrical acoustic wavefront generation by means of ionic speakers
DOI:
https://doi.org/10.37537/rev.elektron.2.2.53.2018Keywords:
ionic transducers, acoustic radiation, sonic crystalsAbstract
We present the use of ionic transducers to generate acoustic waveforms of cylindrical shape. We resorted to “cold discharge” transducers where momentum transfer from ions to neutral molecules is the main sound-generating process. Since the electrodes can be given a fairly arbitrary shape and the airflow is normal to the former, it is possible to obtain, close to the electrodes, a wavefront quite different from those obtained with standard, piston-like, loudspeakers. We present the acoustical characteristics of a cylindrical transducer and the use in the study of a bandpass, sonic-crystal based filter.Downloads
References
L. Beranek and T. Mellow, “Acoustics: sound fields and transducers,” Academic Press, 2012.
F. Bastien, “Acoustics and gas discharges: applications to loudspeakers,” Journal of Physics D: Applied Physics, vol. 20, no. 12, p. 1547, 1987.
P. Bequin, K. Castor, P. Herzog, and V. Montembault, “Modeling plasma loudspeakers,” The Journal of the Acoustical Society of America, vol. 121, no. 4, pp. 1960–1970, 2007.
Y. Sutton, P. Johnson, G. Naidis, D. Sharp, and N. Braithwaite, “A numerical and experimental investigation of an axially symmetric rf plasma,” Journal of Physics D: Applied Physics, vol. 45, p. 455201, 2012.
M. Robinson, “A history of the electric wind,” Am. J. of Phys., vol. 30, no. 5, pp. 366–372, 1962.
D. M. Tombs, “Corona wind loud-speaker,” Nature, vol. 30, p. 923, 1955.
K. Matsuzawa, “Sound sources with corona discharges,” The Journal of the Acoustical Society of America, vol. 54, no. 2, pp. 494–498, 1973.
P. Gómez, M. D’Onofrio, and G. Santiago, “Acoustic characteristics and distortion of an ionic loudspeaker,” IEEE Latin America Transactions, vol. 13, pp. 578–582, 2015.
H. Moller and C. Thomsen, “Electroacustic free field measurements in ordinary rooms using gating techniques,” Audio Engineering Society Convention, vol. 52, 1975.
W. Williams, N. G. Parke, D. A. Moran, and C. H. Sherman, “Acoustic radiation from a finite cylinder,” The Journal of The Acoustical Society of America, vol. 36, no. 12, pp. 2316–2322, 1964.
A. Alberti, P. M. Gómez, I. Spiousas, and M. C. Eguı́a, “Broadband resonant cavity inside a two-dimensional sonic crystal,” Applied Acoustics, vol. 105, pp. 1–5, 2016.
A. Alberti, I. Spiousas, P. M. Gómez, and M. C. Eguı́a, “Resonance switching in a large sonic crystal cavity,” Applied Acoustics, vol. 116, pp. 390–393, 2017.
Downloads
Published
Issue
Section
License
The authors who publish in this journal agree with terms established in the license Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
