Amplitude statistics of electromagnetic noise in coal mines.
Proceedings of Thru-the-Earth Electromagnetics Workshop, August 15-17, 1973, Colorado School of Mines, Golden, Colorado. Geyer RG, ed., Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Grant G0133023, 1973 Dec; :156-160
A system for measuring amplitude probability distributions (APD's) of electromagnetic noise in coal mines is described and typical APD's from an underground coal mine are presented. The APD is a basic statistic required for the design and analysis of communication systems, especially those intended for use in noisy environments, and where neither overdesign nor underdesign is acceptable. The rms and average field strengths are obtained by integration of the APD, and examples are shown at several frequencies. All field strength levels are given in absolute units. Selected frequencies cover the range from 10 kHz to 32 MHz.
Mining-industry; Mining-equipment; Underground-mining; Radio-waves; Electromagnetic-energy; Electromagnetic-fields; Electromagnetic-wave-transmission; Electromagnetic-interference; Coal-mining
Proceedings of Thru-the-Earth Electromagnetics Workshop, August 15-17, 1973, Colorado School of Mines, Golden, Colorado
National Bureau of Standards