The detection of the coal roof interface by use of high pressure water
- JAN 1, 1981.
- Physical Description:
- 1 electronic document
- Restrictions on Access:
- Unclassified, Unlimited, Publicly available.
- A device whereby water jets can be used to detect the interface between coal and the overlying roof rock is described. Once this identification is made this distance can be measured using instruments such as the autofocus systems recently developed in the photographic industry. Experiments carried out show that the device can discriminate between coal and rock at coal thicknesses up to 8 inches. An autofocus system was examined which indicates accuracies of better than 0.1 inches.
- NASA Technical Reports Server (NTRS) Collection.
- Document ID: 19820009681.
Accession ID: 82N17555.
- No Copyright.
View MARC record | catkey: 15717036