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Radio location of a trapped miner in an anisotropic coal field
Author(s) -
Negi Janardan G.,
Saraf Padmakar D.
Publication year - 1975
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs010i004p00445
Subject(s) - anisotropy , dipole , electromagnetic field , geophysics , geology , electric field , coal mining , cover (algebra) , field (mathematics) , coal , computational physics , physics , optics , chemistry , mechanical engineering , mathematics , engineering , pure mathematics , organic chemistry , quantum mechanics
Low frequency communication from a trapped miner is idealized as the electromagnetic boundary value problem of two‐layered anisotropic earth energized by a buried vertical electric dipole. The shale beds form the anisotropic cover for the coal swamp. Using numerical integration techniques the field structure has been investigated on the air‐earth interface. Analysis reveals that conductivity‐anisotropy modified the electromagnetic fields quite significantly and needs to be taken into account for the precise location of the source in emergency situations.