Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1979-10-29
1981-07-28
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 2704
Patent
active
042812852
ABSTRACT:
This invention relates to a new type of instrument for measuring the moisture in materials, particularly in earth and sand. According to the invention, the instrument comprises a constant amplitude microwave signal generator, a waveguide container for a sample of moist material, a microwave signal amplitude detector and a directional coupler of high directivity disposed between said generator, said container and said detector.
By means of said directional coupler the constant amplitude microwave signals are transmitted to the sample, which reflects to same, and reflected signals are transmitted to the detector.
REFERENCES:
patent: 3162807 (1964-12-01), Alford
patent: 3482160 (1969-12-01), Prine
C.I.S.E. Centro Informazioni Studi Esperienze S.p.A.
Flocks Karl W.
Krawczewicz Stanley T.
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