Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-04-15
1977-10-04
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 2704
Patent
active
040526666
ABSTRACT:
A method of determining vegetation height and water content of vegetation from the intensity and state of elliptical polarization of a reflected train of microwaves. The method comprises the steps of reflecting a circularly polarized train of microwaves from vegetation at a predetermined angle of incidence, detecting the reflected train of microwaves, determining the ratio of the intensities of the electric field vector components, measuring the phase difference of the components, and computing the refractive index and thickness of the layer of vegetation from a formula, wherein the refractive index is given essentially by the water content of the vegetation.
REFERENCES:
patent: 2640190 (1953-05-01), Rines
patent: 3093825 (1963-06-01), Allen
patent: 3133246 (1964-05-01), Jaffee et al.
patent: 3144601 (1964-08-01), Slabodsky
patent: 3534260 (1970-10-01), Walker
patent: 3629698 (1971-12-01), Lamb
patent: 3688189 (1972-08-01), Lamb
Auer Siegfried O.
Fletcher James C. Administrator of the National Aeronautics and Space
Schutt John B.
Krawczewicz Stanley T.
Manning John R.
Marchant Robert D.
Tresansky John R.
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