Radio propagation in a coal seam and the inverse problem
Journal Article
·
· J. Res. Natl. Bur. Stand. (U.S.); (United States)
OSTI ID:6417259
The longwall method of mining in underground coal seams is very efficient in uniform seams, but coal seam anomalies can make the method unprofitable and unsafe. This paper describes the theoretical basis for detection of coal seam anomalies using medium frequency (MF) radio transmission over paths on the order of 200 m in length. The key to the method is the sensitivity of the attenuation rate of the coal seam mode of propagation to changes in the coal seam parameters, such as height or electrical conductivity. From a large number of transmission paths, the principles of tomography can be used to reconstruct an image of the seam.
- Research Organization:
- National Bureau of Standards, Boulder, CO
- OSTI ID:
- 6417259
- Journal Information:
- J. Res. Natl. Bur. Stand. (U.S.); (United States), Journal Name: J. Res. Natl. Bur. Stand. (U.S.); (United States) Vol. 89:5; ISSN JRNBA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
012000* -- Coal
Lignite
& Peat-- Mining
58 GEOSCIENCES
580203 -- Geophysics-- Geophysical Survey Methods-- (1980-1989)
COAL DEPOSITS
COAL SEAMS
DIMENSIONS
EFFICIENCY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ENGINEERING GEOLOGY
EXPLORATION
GEOLOGIC DEPOSITS
GEOLOGY
HETEROGENEOUS EFFECTS
IMAGES
LONGWALL MINING
MINERAL RESOURCES
MINING
PHYSICAL PROPERTIES
RADIATIONS
RADIOWAVE RADIATION
RESOURCES
THICKNESS
UNDERGROUND MINING
VARIATIONS
WAVE PROPAGATION
012000* -- Coal
Lignite
& Peat-- Mining
58 GEOSCIENCES
580203 -- Geophysics-- Geophysical Survey Methods-- (1980-1989)
COAL DEPOSITS
COAL SEAMS
DIMENSIONS
EFFICIENCY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ENGINEERING GEOLOGY
EXPLORATION
GEOLOGIC DEPOSITS
GEOLOGY
HETEROGENEOUS EFFECTS
IMAGES
LONGWALL MINING
MINERAL RESOURCES
MINING
PHYSICAL PROPERTIES
RADIATIONS
RADIOWAVE RADIATION
RESOURCES
THICKNESS
UNDERGROUND MINING
VARIATIONS
WAVE PROPAGATION