Measurements of medium frequency propagation characteristics of a transmission line in an underground coal mine.
Li-J; Whisner-B; Waynert-J
IEEE Trans Ind Appl 2013 Sep-Oct; 49(5):1984-1991
In underground coal mines, medium frequency (MF) communication systems couple their signals to metal infrastructures such as AC power cables and wire-based telephone lines, which guide the signals to propagate for a long distance. To better understand the propagation characteristics of MF signals, an easy-to-use measurement method was recently developed at the National Institute for Occupational Safety and Health. The method will be introduced along with an equivalent transmission line model for a long metallic infrastructure in underground coal mines. The model serves as the fundamental driver for the method development. Propagation measurements on a twisted pair of telephone lines in an underground mine were made using this method. The measurements confirmed the low MF signal attenuation rate and the dependence of the propagation characteristics of the line on the electrical properties of surrounding coal and rock as theoretical studies predicted.
Mining-industry; Underground-mining; Coal-mining; Electromagnetic-wave-transmission; Radiofrequency-radiation;
Author Keywords: Communication systems; electromagnetic propagation; impedance measurement; mining industry; noise; parameter estimation; propagation constant; propagation losses; RF signals; transmission line measurements
Jingcheng Li, Ph.D., National Institute for Occupational Safety and Health, 626 Cochrans Mill Road, Pittsburgh, PA 15236, USA
IEEE Transactions on Industry Applications