Patent Document ID: RE32563
Application ID: 06889896
Patent Status: 1

Claim One:
1. A method for detecting geological anomalies in underground coal seam formations comprising placing an FM transmitter having continuous wave transmit capabilities in a medium frequency range of between approximately 300 KHz to approximately 800 KHz about a coal seam to be analyzed, the transmitter including a tuned-loop antenna for propagation through said seam; placing a medium frequency FM receiver having continuous wave receive capability and including a tuned-loop antenna about said seam remote from the position of the transmitter with said seam intermediate to the transmitter and receiver, said tuned-loop antennas of the receiver and transmitter being positioned to be vertical to said seam, said receiver further including measuring and recording means for measuring and recording a plurality of characteristics of said received waves propagated through said seam; exposing said seam to a plurality of transmissions of continuous wave medium frequency waves with an azimuthal magnetic field component propagated horizontally through said seam from the transmitter towards the receiver; measuring a plurality of signal transmission characteristics through said seam; generating a number of data points by locating both the transmitter and receiver at several points about said seam such that for each transmitter location the receiver is placed at a plurality of preselected points about said seam; calculating a plurality of expected signal transmission characteristics through said seam; and comparing said calculated signal transmission characteristics with said measured signal transmission characteristics and generating a graphical representation of said formation thereform.