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8/1/2004 - Conference papersField studies were conducted to record electromagnetic (EM) emissions at the Galena Mine, Wallace, Idaho. The goal of the research was to determine if EM emissions were valid precursors to imminent ground failure.
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7/1/1994 - Conference papersThe paper, presents the results of roof coal thickness measurements in underground mines and rib coal thickness measurements in highwall mines. The microwave sensor described uses a unique spatial modulation scheme created by antenna motion, along with ...
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2/1/1990 - Contract reportsThis supplement to the final report is a collection of interim and monthly reports and working memoranda prepared during the course of this program to document the progress, methods and results of the work.
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9/1/1986 - Contract reportsThis report describes the creation of an efficient method to determine if command, control, communication, and monitoring (3cm) equipment in coal, metal, and nonmetal mines is susceptible to radio frequency interference (RFI) from the medium-frequency (...
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2/1/1981 - Contract reports, Open File ReportsA survey of electromagnetic noise reports was performed and a summary of the results are given.
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1/1/1979 - Contract reportsThis report contains a summary of analytical research on electromagnetic methods of nondestructive testing of cylindrical conductors. The principal objective is to provide theoretical insight to the operation of electromagnetic sensing of the internal p...
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8/1/1978 - Conference papersMedium-frequency (MF) waves can propagate in a coal seam, bounded above and below by conducting rock, in an approximate transverse electro-magnetic (TEM) transmission-line mode with the electric field vertical and the magnetic field horizontal. The theo...
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9/1/1977 - Contract reportsThis report describes magnetic field measurements in the Helvetia Coal Co. Lucene No. 8 Mine for purposes of deriving a mapping of the magnetic field strength covering the major haulageways which contain conductors.
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9/1/1974 - Contract reportsTwo different techniques were used to make measurements of the absolute value of electromagnetic noise in an operating hardrock mine, Grace Mine, located near Morgantown, Pennsylvania.
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9/1/1974 - Contract reportsMeasurements of surface magnetic field noise were made at various locations over the Geneva Coal Mine near Price, Utah, on June 12, 1973. Results of measurements of distant sferics indicate rather sharp cutoff frequencies below which broadband, impulsiv...
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Content source: National Institute for Occupational Safety and Health, Mining Program