Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1980-10-02
1982-12-14
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
128632, 324 585C, G01R 2704
Patent
active
043640087
ABSTRACT:
In an apparatus for measuring the moisture content of a target material, the apparatus has means for generating an electromagnetic wave of a microwave frequency. The electromagnetic wave is guided by a guiding means. Detecting means are provided for detecting the wave. Focussing means are provided to focus the wave onto the target, at a specified depth, which is adjustable.
REFERENCES:
patent: 2999982 (1961-09-01), Broussaud
patent: 3441844 (1969-04-01), Busher et al.
patent: 3490037 (1970-01-01), Williams
patent: 3693079 (1972-09-01), Walker
patent: 3811087 (1974-05-01), Schmelzer
patent: 3815019 (1974-06-01), Wilkes
patent: 4013065 (1977-03-01), Copland et al.
patent: 4052666 (1977-10-01), Auer et al.
"A Nondestructive Method for Measuring the Complex Permittivity of Dielectric Materials at Microwave Frequencies Using an Open Transmission Line Resonator" by E. Tanabe & W. T. Joines, IEEE Transactions On Instrumentations and Measurement, vol. 1m-25, No. 3, Sep. 1976.
"Transepidermal Water Loss from Dry and Normal Skin" by J. Leveque, J. Garson and J. de Rigal.
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