Acoustic 'cloaking device' shields objects from sound

Scientists have shown off a "cloaking device" that makes objects invisible – to sound waves.

Such acoustic cloaking was proposed theoretically in 2008 but has only this year been put into practice.

Described in Physical Review Letters, the approach borrows many ideas from attempts to "cloak" objects from light.

It uses simple plastic sheets with arrays of holes, and could be put to use in making ships invisible to sonar or in acoustic design of concert halls.

Much research has been undertaken toward creating Harry Potter-style "invisibility cloaks" since the feasibility of the idea was first put forward in 2006.

Full Article at BBC News