Researchers at the MIT's Lincoln Laboratory have apparently been able to find a way to send secret messages directly into the ear of a person the need for the receiver to use special communication.
Operator simply has to point a laser at some one of the distance. This person hears the transmitted sound but others in the same area no.
They develop laser systems that can transmit tones, music and certified speeches in conversation volumes to specific people who do not need to use a special team.
How It Works
In a study published in the magazine Optical Letters On Friday, the researchers described two different methods for transmitting audio messages by laser.
Both use the called photoacoustic effect that occurs when sound waves are formed as a result of material absorbing light. Researchers used water steam in the air as the material.
"Laser transmits the message that is coded on a modular laser beam and sent directly to the receiver's ear with the photo-effects effect", which the researchers have written in their study.
One of the methods involves shaving a laser through the speed of sound and changing the length of the blades to codify different audible fields.
This technique can transmit a sound to a person over 8.2-mile at 60 decibels, the volume of background music or conversation in restaurants. The receiver of the message can hear the sound, without anyone hearing it.
The researchers are working to improve the method, so that it works longer distances.
The other method involves encoding an audio message by adjusting the power of the laser beam. Researchers have said that this produces clearer but clear results.
The technology can provide a new way for people to communicate secretly. Audio messages can be exchanged through a multitude of places without other people hearing them.
Now the transmission is far away, the technology can have important military applications. It can help soldiers exchange hidden messages in the battlefield. It can also be used in dangerous situations such as during mass-shooting, when specific people can be secretly warned about an active gun.
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