Microwave Measurement of Coal Layer Thickness.
NTIS: Com 74-11643 Available for Reference At Bureau Libraries :33 pages
The possibility of using a microwave system to measure coal layer thickness in a mine was investigated. Measurements were made in two different mines near Pittsburgh, Pennsylvania, and near Fairview, West Virginia. Frequencies in the range from 0.5 Ghz to 4.0 Ghz were used to measure samples 10 to 40 cm thick. All samples were backed with a naturally occurring draw slate. The results indicated a definite possibility of determining layer thickness in most cases, although anomalies may introduce enough error to give misleading results in some cases. Data from a model and measured data show considerable agreement.
CP; Final Contract Report;
NTIS Accession No.
NTIS: Com 74-11643 Available for Reference At Bureau Libraries
National Bureau of Standards