Thickness measurement system

Details Thickness measurement system Thickness measurement system

1977-10-31

1979-07-17

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 5NA, G01S 924

Patent

active

041617312

ABSTRACT:
An FM radar for the measurement of coal thickness wherein an FM transmitter is modulated by the combination of two signals, one, for example, being of a frequency of 100 Hz, and the other being of 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, the antenna being positioned flush against the coal.

REFERENCES:
patent: 3068471 (1962-12-01), Erst

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