Development of a Coal-Rock Interface Sensor (Phase 1)

摘要

Research under Phase I was performed to determine the feasibility of horizon sensor technology. The proposed horizon sensor is based on an electromagnetic (EM) wave process and will be used to detect changes in uncut coal thickness on the roof and floor of mines. The sensor is composed of a horizontal loop antenna which is driven at its resonant frequency. The input conductance of the loop is measured and correlated with coal layer thickness using electronic circuits interfaced to a microprocessor. Control information is presented to the shearing machine operator indicating if the cutting drum should be lowered or raised to return the coal layer to the desired thickness. The sensor will be mounted on the shearing machine and will be extended to a position directly behind the cowl of the cutting drum.