America presents 'invisibility cloak' before sound waves

US scientists have just released a special "invisibility cloak" for sound, which is considered to be able to help bring a new beneficial tool to intelligence agents.

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"Invisibility cloak" sound is actually a device shaped like an ancient Egyptian pyramid, consisting of several pieces of perforated plastic that are assembled in a special way together. Engineers at Duke University (North Carolina, USA) claim that, unlike other products, their "invisibility cloak" works on all three sides of the device, despite the direction of the sound. bar.

"Our trick is to hide objects before sound waves. By placing this" shirt "around an object, sound waves behave like only flat surfaces on their path," Steven Cummer, spear. Professor of electronics and computer engineering, explained.

"Invisibility cloak"sound of American researchers.(Photo: Daily Mail)

To achieve the effect, Professor Cummer and colleagues used metamaterials that have light scattering properties. According to Nature Materials, the team's equipment is a product that combines metamaterials in repetitive forms to achieve unnatural properties.

Metamaterials manipulate the behavior of sound waves in the 3D pyramid, changing their path as reflected on a flat surface. Since sound waves cannot penetrate inside the pyramid, they travel at shorter distances and are therefore affected by speed.The "invisibility cloak" then re-establishes the path of these slower moving sound waves to create the impression that neither the device nor anything below it exists.

"The structure we build may look simple, but it's really more complex and interesting. We have spent a lot of effort calculating how sound waves interact with the device." Professor Cummer stressed.

Cummer believes, the technology is potentially more commercial. For example, although the research team has successfully tested the device in the air, it can be used to avoid underwater negative navigation systems. People can also use it to design concert halls, theaters, etc. to control sound, or create tools to help intelligence agents overhear secret conversations without being detect.