NASA NTRS · 19790017272
Coal-shale interface detection
Abstract
A penetrometer for coal-shale interface detection is presented. It is used with coal cutting equipment consisting of a reciprocating hammer, having an accelerometer mounted thereon to measure the impact of the hammer as it penetrates the ceiling or floor surface of a mine. Additionally, a pair of reflectometers simultaneously view the same surface, and the outputs from 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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Broussard, P. H., Burch, J. L., Drost, E. J., Stein, R. J.. 1979-05-15. Coal-shale interface detection. https://ntrs.nasa.gov/citations/19790017272
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