Abstract
The paper discusses the possibility of organizing a wireless data transmission channel in place of different kinds of mines for signalling and emergency communication using electromagnetic waves in the VLF propagation (300 Hz - 3 kHz). The paper gives theoretical estimates of the efficiency of propagation of electromagnetic waves in rocks and minerals with different values of electrical conductivity. The dependence of the depth of penetration on frequency is also studied. A review of the existing technical solutions to this problem is given. An analytical and numerical analysis of the current density in the rock and the magnetic field created by it using a radiating long cable is given. Reception of a signal with an informational message is carried out with the help of an individual radio tag informing personnel both in conditions of the mine’s normal operation and in emergency situations. Comparative evaluations of the efficiency of using radio tags with different configurations of a receiving antenna in mine conditions at a depth of up to 800 m are given.
Highlights
Working in mines is connected with the risk of explosions and rock falls
Reliable communication is an important part of emergency response
Let us analyze the magnetic field of the antenna in the form of a straight cable with L length and J current, which is located on the border of the half space along the x axis: the electrical conductivity of the half space is σ1, air - σ2
Summary
Working in mines is connected with the risk of explosions and rock falls. Under these conditions, reliable communication is an important part of emergency response. Information transfer systems between mine workings (horizons) use fully or partially wired methods of implementing a communication channel, which increases the risk of a channel breakage in emergency situations [1,2,3,4]. Wireless communication methods for mines can be conventionally divided into low-frequency, which use extended antenna-feeder devices for signal transmission, and high-frequency VHF-range, which are composed of wired communication lines in the form of a radiating cable laid along tunnels [1,2,3,4]. A large range of scientific studies presented in the scientific press confirms the importance of this field of research
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