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EM location system prototype and communications station modification.

Authors
Farstad-AJ; Fisher-C Jr.; Linfield-RF; Allen-JW
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, OFR-68-73, :1-107
NIOSHTIC No.
10001481
Abstract
A prototype electromagnetic (em) location system consisting of six miniature transmitters, six miniature receivers, and one multichannel receiver was developed by westinghouse georesearch laboratory and is described in this report. The equipment was designed to operate in a deep coal mine of relatively high overburden conductivity. One mine having these characteristics is the genevea coal mine operated by the U.S. Steel Corp. Near dragerton, Utah. The equipment was tested there. The system consisted of six manpack transmitters and six manpack receivers covering the frequency band from 900 hz to 2,900 hz as well as a six- channel receiver designed for use in a helicopter. Tests showed that em signals from lightweight (3/4 lb) transmitters could be detected both on the surface and from a helicopter through as much as 1,650 feet of relatively high conductivity (2 x 102 mhos/m) overburden. Furthermore, the resulting field strength profiles could be used to determine source location to within 150 feet of the actual surveyed location in the mine.
Keywords
Mine-gases; Mining-industry; Methanes; Methane-drainage; Methane-control; Explosive-gases; Explosive-atmospheres; Underground-mining; Coal-mining; Control-technology; Engineering-controls
CAS No.
74-82-8
Publication Date
19730101
Document Type
CP; Final Contract Report
Fiscal Year
1973
NTIS Accession No.
PB-226660
NTIS Price
A07
Identifying No.
OFR-68-73
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, OFR-68-73
State
PA; UT
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