Laboratory tested concept, for measuring thickness of overhead coal using noncontacting sensor system coupled to controller and high pressure water jet, allows mining machines to remove virtually all coal from mine roofs without danger of cutting into overlying rock.
Measuring coal thickness
NASA Tech Briefs ; 4 , 3
1980-04-01
Miscellaneous
No indication
English
NTRS | 1984
|Measuring insulation thickness
NTRS | 1979
|Improved Coal-Thickness Measurement
NTRS | 1984
|Measuring Water-Layer Thickness
NTRS | 1986
|