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Coal-shale interface detectionA 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.
Document ID
19790017272
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Broussard, P. H. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Burch, J. L. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Drost, E. J. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Stein, R. J. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
September 4, 2013
Publication Date
May 15, 1979
Subject Category
Earth Resources And Remote Sensing
Accession Number
79N25443
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-4,154,084|NASA-CASE-MFS-23720-3
Patent Application
US-PATENT-APPL-SN-848420

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