Created the world’s first acoustic circulator transmits sound in one direction only




A team of researchers from the University of Texas has created the world’s first single-sided acoustic circulator disproves the theory that “if you can hear it and you can hear.” Created quite a compact device and controlling the direction of the sound waves , allows the user to hear the sound, but I myself will not be heard.

According to the fundamental theory, all physical waves exhibit symmetry. This means that if the wave travels in a certain direction, and it can move backwards. If engineers have long radio waves able to bypass rule using magnetic materials, the electrons which are oriented in one direction. Now the scientists decided to try a similar technique to acoustic oscillations.

Classic circulator is a three-port device in which the signal is sent successively from one port to another. In this case, when one port is not used, it works as an insulator, blocking the return signal sent.

A team of specialists has used this design for use of sound waves . In circulator was placed fan spinning at a certain speed, the purpose of which was air injection. All the sounds passing through the cavity, channeled through one of the three tubes. At the end of each of them was located in microphone. Thus, the air flow created inside at which sound could only move in one direction.

For example, a person who is at the end of the first tube, could send a signal to the listener in the second tube, but would not hear the answer. At the same answer the second user could hear the third.

Such devices will operate as a sound-sided mirrors and can be used to listen to humans. In this spy can hear the entire conversation without fear itself be heard.

Sami researchers believe that this technology can be widely used in isolation facilities, such as sound studios, as well as soundproofing motorways, aircraft, submarines.

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