Coal-shale interface detector

Details Coal-shale interface detector Coal-shale interface detector

1977-11-03

1980-04-01

Ruehl, Charles A.

Measuring and testing

Testing by impact or shock

Specimen impactor detail

73 82, G01N 348

Patent

active

041955129

ABSTRACT:
A coal-shale interface detector for use 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.

REFERENCES:
patent: 2944804 (1960-07-01), Persson et al.
patent: 3759085 (1973-09-01), Wilson et al.
patent: 4034603 (1977-07-01), Leeb et al.

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