Sound cloak

New device hides objects from sonar

By Stephen Ornes, 22:20 PM April 14, 2013


Caption: This strange-looking cage can hide an object inside it from being detected by sound waves. Credit: L. Sanchis et al



It would be easy to mistake engineer José Sánchez-Dehesa’s latest creation for a trinket. The plastic gizmo is a mere 17 centimeters (6.7 inches) long and looks like a cross between a birdcage and an ostrich egg. But appearances can be deceiving. This little device achieves something never done before: It hides a solid object from sound waves. Essentially, it’s a cloaking device.


The device makes objects invisible to sonar. Sonar devices send out sound waves in search of objects in the d...

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