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.
…researchers quickly found out that the mathematics behind bending these light waves, called transformation optics, could also be applied to sound waves. “Fundamentally, in terms of hiding objects, it’s the same – how anything is sensed is with some kind of wave and you either hear or see the effect of it,” said Steven Cummer of Duke University. “But when it comes to building the materials, things are very different between acoustics and electromagnetics.
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