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 Josť SŠnchez-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 |
you like to contribute a story tip?
Get the URL of the story, and the related sf author, and add
Comment/Join discussion ( 0 )
Related News Stories -
Solar Plane Circles The Globe
'Tropism-like pursuit of the sun across the sky as they recharged their batteries...' - Roger Zelazny
Turing's Nose - Was That Scent Real Or Artificial?
'Rippling arpeggios of thyme and lavender...' - Aldous Huxley, 1932.
Cost Effective Smart Windows To Replace Curtains?
'The polawindow, which he tuned to clear transmission.' - Frank Herbert, 1972.
Autonomous Tractor Harvest-Ready
'[He] dropped the handles of the plough that was plugged into the robomule...' - Harry Harrison, 1965.
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.
Mobility Scooters Go Offroad
'Noiselessly, on rubber-tired wheels, they journeyed down the long aisles...'
RAMST - Robotically Assembled Modular Space Telescope
'The eight thin metallic legs were pointed downwards, balanced delicately...'
Terminal Snooping At Bloomberg
'The evidence began with a slowed response at her computer terminal.'
Will There Be A Digital Afterlife?
'A quick exchange of energies resulting from the relocation of discorporate states.'
ROCKY - Resistive Overload Combined With Kinetic Yo-Yo
'Joe got out the gravity-simulator harnesses..'
China Bans Self-Driving Car Testing
Innovation hits some bumps.
Robotic Lawnmower Fulfills SciFi Homeowner's Dreams
'The mower reached the edge of the lawn, clucked to itself like a contented hen...'
7-Eleven Drone Delivers Chix Sandwich And Slurpee
'It was a smooth ovoid floating a few inches from the floor...'
Beta-Ti3Au Titanium-Gold Alloy Hardest Tissue-Compatible Metal
It needs a more science-fictional name!
Solar Plane Circles The Globe
'Tropism-like pursuit of the sun across the sky as they recharged their batteries...'
Audiobooks - Fastest Growing Format In Publishing
'The public preferred lectons...'
SuperMeat - Crowdfunding Pohl/Kornbluth's Chicken Little
'Chicken Little, who would be sliced and packed to feed people from Baffinland to Little America.'
Martian-Grown Food Might Be Fine
'I donít want to come off as arrogant here, but Iím the best botanist on the planet.'
MARLO Robot Attempts Wave Field
'It is apparent that he will walk before his human brother.'
3RDiTEK Lifeblogging Headband Camera
'It's logging anyway - everything you see on duty goes into the black box.'
3D-Printed Biohybrid Is A Tissue-Engineered Robot
'The directing neurological tissue that forms the basis of the swibble is alive...'
More SF in the News Stories
More Beyond Technovelgy science news stories