A self-silenced sound beam

Authors: Hedberg, C.¹; Haller, K.²; Kamakura, T.³

Source: Acoustical Physics, Volume 56, Number 5, September 2010 , pp. 637-639(3)

Publisher: MAIK Nauka/Interperiodica

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Abstract:

Parametric loudspeakers are transmitting two high power ultrasound frequencies. During propagation through the air, nonlinear interaction creates a narrow sound beam at the difference frequency, similar to a light beam from a torch. In this work is added the physical phenomenon of propagation cancellation, leaving a limited region within which the sound can be heard—a 1 meter long cylinder with diameter 8 cm. It is equivalent to a torch which would only illuminate objects within 1 meter. The concept is demonstrated both in simulation and in experiment.

Document Type: Research article

DOI: http://dx.doi.org/10.1134/S1063771010050064

Affiliations: 1: Email: claes.hedberg@bth.se 2: Email: kristian.haller@bth.se 3: Email: kamakura@ee.uec.ac.jp

Publication date: 2010-09-01