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Microwave Measurement of Coal Layer Thickness.

COM7411643

Publication Date	1974
Personal Author	Ellerbruch, D. A.; Adams, J. W.
Page Count	36
Abstract	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, Pa., and near Fairview, West Virginia. Frequencies in the range 0.5 GHz - 4.0 GHz were used to measure samples between 10 - 40 cm thick. All samples were backed with a naturally-occuring 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. Anomaly detection may be very useful in some cases. More experimental data and theoretical study are needed for complete verification. Data from a model and measured data show considerable agreement.
Keywords	Coal deposits Measurement Microwave equipment Dielectric properties
Source Agency	National Institute of Standards and Technology
NTIS Subject Category	48A - Mineral Industries
Corporate Authors	National Bureau of Standards, Boulder, Colo. Electromagnetics Div.; Bureau of Mines, Pittsburgh, Pa. Pittsburgh Mining and Safety Research
Document Type	Technical Report
Title Note	Final rept. Jun-Aug 74.
NTIS Issue Number	197502
Contract Number	S0144086

Microwave Measurement of Coal Layer Thickness.

Microwave Measurement of Coal Layer Thickness.
COM7411643

Publication Date	1974
Personal Author	Ellerbruch, D. A.; Adams, J. W.
Page Count	36
Abstract	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, Pa., and near Fairview, West Virginia. Frequencies in the range 0.5 GHz - 4.0 GHz were used to measure samples between 10 - 40 cm thick. All samples were backed with a naturally-occuring 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. Anomaly detection may be very useful in some cases. More experimental data and theoretical study are needed for complete verification. Data from a model and measured data show considerable agreement.
Keywords	Coal deposits Measurement Microwave equipment Dielectric properties
Source Agency	National Institute of Standards and Technology
NTIS Subject Category	48A - Mineral Industries
Corporate Authors	National Bureau of Standards, Boulder, Colo. Electromagnetics Div.; Bureau of Mines, Pittsburgh, Pa. Pittsburgh Mining and Safety Research
Document Type	Technical Report
Title Note	Final rept. Jun-Aug 74.
NTIS Issue Number	197502
Contract Number	S0144086