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Coal-shale interface detection systemA 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.
Document ID
19800006166
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Campbell, R. A. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Hudgins, J. L. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Morris, P. W. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Reid, H., Jr. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Zimmerman, J. E. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
September 4, 2013
Publication Date
June 12, 1979
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
Patent Application Number: US-PATENT-APPL-SN-848421
Patent Number: US-PATENT-4,157,655
Patent Number: NASA-CASE-MFS-23720-2
Accession Number
80N14423
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-4,157,655|NASA-CASE-MFS-23720-2
Patent Application
US-PATENT-APPL-SN-848421

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