Acoustic Cloak Research Turns Practical

Acoustic cloaks, material coatings that could divert sound completely around objects, are the subject of continued research. A new study, Acoustic cloaking in two dimensions: a feasible approach, was published today in the New Journal of Physics by Daniel Torrent and José Sánchez-Dehesa from the Wave Phenomena Group, Department of Electronics Engineering at the Polytechnic University of Valencia.

To realise the cloak physically, the Spanish research team calculated how metamaterials constructed with sonic crystals, solid cylinders in a periodic array that can scatter sound waves, could be used in a multilayered structure to divert sound completely around an object.

Results were very encouraging, showing that optimum cloaking requires approximately 200 layers of the metamaterial but that there is scope for much thinner materials to be used than technology can currently produce.

The material could be used in a concert hall to make pillars "disappear" acoustically. Note that this is different (I think) from the idea of creating an open air zone from which sound cannot escape (like Robert Heinlein's hush corner and Frank Herbert's cone of silence).

Read about the original research in 'Inaudibility Cloak' Is Theoretically Possible.

Via Nuisance noise silenced by an acoustic cloak; thanks to Mike Wahl for pointing this one out.

Scroll down for more stories in the same category. (Story submitted 6/13/2008)

Follow this kind of news @Technovelgy.

| Email | RSS | Blog It | Stumble | del.icio.us | Digg | Reddit |

Would you like to contribute a story tip? It's easy:
Get the URL of the story, and the related sf author, and add it here.

Comment/Join discussion ( 0 )

Related News Stories - (" Engineering ")

SCiO Scanner Wants You To Be Spock
Almost as easy as a tricorder? Apparently, you can pre-order one now.

Harvesting Energy From Internal Resonance
'Sometimes a man has a windmill on his roof...' - John Jacob Astor, 1894.

Sticker Harvests Energy From Your Skin
Another way to harvest power from the body.

Army Wants Invisibility Cloaks
No, you can't see me. Nope, not here.

 

Google
  Web TechNovelgy.com   

Technovelgy (that's tech-novel-gee!) is devoted to the creative science inventions and ideas of sf authors. Look for the Invention Category that interests you, the Glossary, the Invention Timeline, or see what's New.

 

 

 

 

 

Current News

Denisovans, Neandertals... And Us?
'But in far realms, among strange hominids, you couldn't shun each other, either.'

Patented! Google's Autonomous Delivery Trucks
I hope Google's trucks can find my house!

3 Parent Embryos Approved By Bioethicists
' A tkan merely courts a mlenb and is attracted to a good guur...'

DIY Armed UAV (Toy)
'Each a television eye and a sonic stunner...'

Tired Of Speeders On Your Block? DIY Speed Tracker!
'There is no danger of a vehicle's speed exceeding that allowed in the section in which it happens to be...'

Centriphone Whirling Selfie Camera
''Tight mid-shot and pull out on but behind me,' he told it...'

Eagles Vs. Drones
'Moon bird's view was... partly blocked by the pyramid, so that he did not see the bird-things dark against the brilliant sky...'

SCiO Scanner Wants You To Be Spock
Almost as easy as a tricorder?

Self-Adapting Composite Heals Itself
'...Could seal the punctures that grain-of-sand-sized meteors might make.'

Rigid Clothing, Or Wearable Furniture?
'Earth's scientists solved the problem to some extent by devising rigid metallic clothing...'

Swarming Intelligent Aquatic Surface Robots Ahoy!
'A remote-controlled emulsion, as it were, with uniform center...'

SuitX Cheap Medical Exoskeleton
'... standing on two corrugated-soled titanium footplates...'

Harvesting Energy From Internal Resonance
'Sometimes a man has a windmill on his roof...'

Sticker Harvests Energy From Your Skin
Another way to harvest power from the body.

Twitter Sarcasm Detected By Computer
Seriously?

Myo-Controlled Prosthetic Arm
'Sensitive actuators touch the tendons in your right wrist.'

More SF in the News Stories

More Beyond Technovelgy science news stories

Home | Glossary | Invention Timeline | Category | New | Contact Us | FAQ | Advertise |
Technovelgy.com - where science meets fiction™

Copyright© Technovelgy LLC; all rights reserved.