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Physicists Generated Sound Waves That Travel In One Direction Only
An anonymous reader quotes a report from ScienceAlert: Imagine three people huddled in a circle so when one speaks, only one other hears. Scientists have created a device that works like that, ensuring sound waves ripple in one direction only. The device, developed by scientists at ETH Zurich and th...
The device, developed by scientists at ETH Zurich and the Swiss Federal Institute of Technology Lausanne, is made up of a disk-shaped cavity with three equally-spaced ports that can each send or receive sound. The trick is to blow swirling air into the cavity at a specific speed and intensity, which allows the sound waves to synchronize in a repeating pattern. "This concept of loss-compensated non-reciprocal wave propagation is, in our view, an important result that can also be transferred to other systems," says senior researcher Nicolas Noiray.
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