Acoustic cloaking device echoes advances in optical cloaking

Aug 15, 2011

Optical cloaking devices that enable light to gracefully slip around a solid object were once strictly in the realm of science fiction. Today they have emerged as an exciting area of study, at least on microscopic scales.

A new twist on this intriguing technology can now be "seen" in the field of acoustics. A team of researchers from the Universitat Politecnica de Valencia and the Universidad de Valencia have created a prototype of an acoustic cloak by using a 2-D .

Unlike sound-canceling technologies that eliminate noise by creating the exact-but-opposite waveform, an acoustic cloak would enable to travel around an object without changing their shape or direction.

The proposed sound cloak, as described in the AIP's journal Applied Physics Letters, would consist of 120 cylinders, each 15 millimeters in diameter.

By carefully arranging them around an object 22.5 centimeters across, the researchers experimentally demonstrated that sound waves of a specific frequency (3061 Hertz, with about a 100-Hertz bandwidth) maintain their original wave-front pattern as they pass around and beyond the object.

According to the researchers, the narrow operating band of the cloak can be overcome by increasing the number of cylinders used to create the cloak.

If such a technique could be applied in real-world designs, it could enable better soundscapes in urban environments, better acoustics in performance halls, and quieter helmets that protect the ears from extreme noises, the researchers speculate.

"Acoustic cloak for airborne sound by inverse design" is published in .

Explore further: IHEP in China has ambitions for Higgs factory

Provided by American Institute of Physics

5 /5 (1 vote)
add to favorites email to friend print save as pdf

Related Stories

New invisibility cloak hides objects from human view

Jul 27, 2011

For the first time, scientists have devised an invisibility cloak material that hides objects from detection using light that is visible to humans. The new device is a leap forward in cloaking materials, according to a report ...

Next generation cloaking device demonstrated

Jan 15, 2009

A device that can bestow invisibility to an object by "cloaking" it from visual light is closer to reality. After being the first to demonstrate the feasibility of such a device by constructing a prototype ...

Recommended for you

IHEP in China has ambitions for Higgs factory

14 hours ago

Who will lay claim to having the world's largest particle smasher?. Could China become the collider capital of the world? Questions tease answers, following a news story in Nature on Tuesday. Proposals for ...

The physics of lead guitar playing

16 hours ago

String bends, tapping, vibrato and whammy bars are all techniques that add to the distinctiveness of a lead guitarist's sound, whether it's Clapton, Hendrix, or BB King.

The birth of topological spintronics

17 hours ago

The discovery of a new material combination that could lead to a more efficient approach to computer memory and logic will be described in the journal Nature on July 24, 2014. The research, led by Penn S ...

The electric slide dance of DNA knots

20 hours ago

DNA has the nasty habit of getting tangled and forming knots. Scientists study these knots to understand their function and learn how to disentangle them (e.g. useful for gene sequencing techniques). Cristian ...

User comments : 1

Adjust slider to filter visible comments by rank

Display comments: newest first

hush1
not rated yet Aug 18, 2011
Kewl
Undisturbed sleeping under a bridge with just the right number of blankets,...I mean,... cloaks of cylinders.

Actually, great news for 'new' acoustic anechoic chambers.
Orchestra's members cloaked, without hearing each other.
No more practice "sound proof" rooms.