Analysis of Communication Systems in Coal Mines.

摘要

The results of a two-year research effort aimed at improving communication systems in coal mines is reported. A review of communication methods presently used in coal mines is presented. Theoretical and experimental results of a four pronged effort in the areas of through-the-earth propagation,paging system design,improvement of wired telephone systems,and carrier current systems are described. Auxiliary systems not included in the above are considered briefly. Various conclusions are drawn in light of practical constraints and the needs of the mining industry. (Modified author abstract)