The move underground, often synonymous with signal loss and interruption of communication.
However, researchers at the Institute for Research in electronics and Telecommunications, south Korea (ETRI) has created a breakthrough noticeable in this area when developing technology that allows voice communication at a depth of 100 meters below the ground without connecting wires.
This technology works based on the principle of underground communications from the school, marking the successful attempt, the first in the world. Instead of using radio waves usually easy to be absorbed by the soil and rock, system of ETRI use magnetic fields at low frequencies. The system includes a transmitter antenna has a diameter of 1 meter placed on the ground and a miniature sensor (hand) is placed under the ground, operates at a frequency of about 15 kHz. This bandwidth is enough to support high-speed data from 2 to 4 kbps help communication 2-way clear.
The research team has successfully tested the possibility of contact between the ground and underground layer second year of a limestone quarry, where wireless technology, the current can not reach. While previous studies only reach a distance of a few tens of meters, ETRI has raised this number to 100 meters and new technology are also designed to be able to reach the distance beyond.
The role of communication underground
Those who followed news about the collapsed mine tunnel or the tunnel will understand the feeling of helplessness of the rescue team when they lost contact with the workers trapped. New technology can completely change the situation, allowing the rescue team in touch with the survivors buried in real time, thereby improving significantly the rate of rescue.
New technology can be viewed as a similar version of the contact features a satellite that Apple integrated in the latest iPhone, which helps those who stuck with no network connection, contact with the rescue services.
In addition to the field of mining and salvage technology from ETRI, also can be applied in the tunnel underground utilities, gas pipelines, and oil, as well as in the operations bunker military. ETRI are also studying the possibility of connecting this system with personal devices such as a smartphone, to increase convenience in situations of actual rescue.
The study was published in the journal IEEE IoT Journalsame time , the patent for the main components of the technology has already been registered.
Source: thanhnien.vn