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Thickness measurement systemAn FM radar for the measurement of coal thickness wherein an FM transmitter is modulated by the combination of two signals; One, for example, could be a frequency of 100 Hz, and the other a frequency of 15 Hz. A horn-type antenna is used which is filled with a material having a dielectric constant approximating that of coal.
Document ID
19790020199
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Barr, T. A. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
September 3, 2013
Publication Date
July 17, 1979
Subject Category
Engineering (General)
Report/Patent Number
Patent Number: NASA-CASE-MFS-23721-1
Patent Number: US-PATENT-4,161,731
Patent Application Number: US-PATENT-APPL-SN-847277
Accession Number
79N28370
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
NASA-CASE-MFS-23721-1|US-PATENT-4,161,731
Patent Application
US-PATENT-APPL-SN-847277

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