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Mining Publication: Electromagnetic Propagation in Low Coal Mines at Medium Frequencies

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Original creation date: January 1978

Image of publication Electromagnetic Propagation in Low Coal Mines at Medium Frequencies

This report covers magnetic field strength measurements versus range and frequency in low to medium coal mines. Both quasi-conductor-free and conductor-proximity areas were investigated. The program covered five mines, four seams, six measurement sets, and three geographic areas. The results are summarized in terms of maximum communication range expected per seam and noise condition. Scatter gain is further explored as a simple measure of energy coupled to conductors.

Authors: TS Cory

Contract/MOA Report - January 1978

  • 2.47 MB

NIOSHTIC2 Number: 10002377

Rockwell International. U.S. Bureau of Mines Contract No. H03777053. NTIS No. PB/82-202656, 1978; :1-94


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