Scientists have created sound technology, invented in the eighties

In the 1980s, inventor Alexander Bell wasintends to create a phone that uses light to transmit sound. For this, he wanted to use the properties of the photoacoustic effect, when the material absorbs light and emits sound waves. Unfortunately, at that time he could not translate his idea into reality due to the lack of a light source of the necessary power and a sufficiently sensitive receiver. Researchers at the Massachusetts Institute of Technology claim that they finally managed to create such a device.

They used a laser as a light source. It turned out to be an excellent option, as it is a fairly intense light source and allows you to use water molecules in the air as absorbing material. By absorbing laser light, these particles emit sound waves that can be transmitted to a person in the opposite corner of the room.

Head of Research Group Charles WynnHe explained that they used the length of the laser, which is absorbed by water as much as possible - the transmitted sound is the loudest. However, the air does not have to be too humid.

The technology can work even in relatively dry conditions, because there is almost always little water in the air, especially around people.

Scientists had two ways to changesound. The first is called photoacoustic spectroscopy - it implies a rapid movement of the laser to change the pitch. Thus, the team of researchers was able to transmit sound at a volume of 60 decibels at a distance of 2.5 m. It is noteworthy that it was heard only at a certain distance - people passing through the laser could not hear anything. The second method changed the pitch by changing the laser power.

In the future, researchers intend to test technology in the open air to find out how wide the range of sound can be.

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