NASA NTRS · 19800006166
Coal-shale interface detection system
Abstract
A coal-shale interface detection system for use with coal cutting equipment consists of a reciprocating hammer on which an accelerometer is mounted to measure the impact of the hammer as it penetrates the ceiling or floor surface of a mine. A pair of reflectometers simultaneously view the same surface. The outputs of the accelerometer and reflectometers are detected and jointly registered to determine when an interface between coal and shale is being cut through.
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Campbell, R. A., Hudgins, J. L., Morris, P. W., Reid, H., Jr., Zimmerman, J. E.. 1979-06-12. Coal-shale interface detection system. https://ntrs.nasa.gov/citations/19800006166
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