Scientists have learned how to hide three-dimensional objects from sound waves




Scientists have learned how to hide three-dimensional objects from the sound waves

For the first time scientists have been able to hide three-dimensional object from the sound waves. Improved model cap of darkness in the future can be used to protect the Navy from detection by radar systems.

The findings are published in the scientific journal Physical Review Letters at the end of last month.

“In this case implemented a simplified diagram of a transfer to the state of invisibility through the use of well-designed, but at the same time, the relatively simple materials,”

– Said Steven Cummer, an electrical engineer from the private Duke University, who was not involved in the study. In 2007, the Cummer proposed his concept sound invisibility cloak .

Earlier attempts of scientists to make objects invisible to the human eye relies on the fact that our perception of the world depends on the scattering of waves. We can perceive the objects around us because light waves hitting the objects are scattered or reflected.

The last few years, scientists have developed a device that blocks light scattering, running light or sound waves around an object. The disadvantage of this approach is the need to use sophisticated synthetic materials, the production of which is difficult.

The research team, led by electrical engineer Jose Sanchez-Dehesa of the Polytechnic Institute of Valencia in Spain, went the other way. Instead of building barriers to sound waves, they put an object (in this case, 8-inch plastic ball) into the structure of the set of rings that prevented the spread of the sound waves.

Sound Waves Cloak

Special algorithms have allowed scientists to create a structure around the ball of the 60 rings of different sizes. Computer modeling has shown that getting the “cage”, the sound waves cancel each other out. A similar trick is used noise canceling headphones.

In view of the simple structure of the plastic cap of invisibility has been printed on the 3D-printer. The subject was found at all frequencies, with the exception of 8.55 kHz. For the first time scientists have been able to mask the sound of a three-dimensional object. For the Office of Naval Research, USA, which partially funded the work, sounds promising.

Talk about submarines invisible to radar systems, it is too early, but the technology can already be used in other, equally useful purposes. For example, to reduce the noise pollution from the congested highway.
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Tags: 3D-printing , sound , Polytechnic University of Valencia , Duke University , invisible cap .


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