A Self-Silenced Sound Beam
| Document type: | Journal Articles |
|---|---|
| Article type: | Original article |
| Peer reviewed: | Yes |
| Author(s): | Claes Hedberg, Kristian Haller, Tomoo Kamakura |
| Title: | A Self-Silenced Sound Beam |
| Journal: | Acoustical Physics |
| Year: | 2010 |
| Volume: | 56 |
| Issue: | 5 |
| Pagination: | 637-639 |
| ISSN: | 1063-7710 |
| Publisher: | Pleiades Publishing |
| URI/DOI: | 0.1134/S1063771010050064 |
| ISI number: | 000281713600006 |
| Organization: | Blekinge Institute of Technology |
| Department: | School of Engineering - Dept. of Mechanical Engineering (Sektionen för ingenjörsvetenskap - avd. för maskinteknik) School of Engineering S- 371 79 Karlskrona +46 455 38 50 00 http://www.bth.se/ing/ |
| Authors e-mail: | claes.hedberg@bth.se, kamakura@ee.uec.ac.jp |
| Language: | English |
| 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. |
| Subject: | Physical Acoustics\General Mechanical Engineering\Structural Dynamics |
| Note: | http://www.maik.ru/cgi-perl/journal.pl?lang=eng&name=acoust |
