Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1979-05-22
1981-01-27
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
73619, G01R 2704
Patent
active
042478154
ABSTRACT:
A physiologic facsimile image of a biological target is obtained by: scang the target by transmitting a microwave signal through the target and measuring at least one of the amplitude and phase components of the complex microwave power transmission coefficient at each one of a plurality of sample locations which are spaced so as to define a two-dimensional array and such that a set of digital data for each of the measured components is obtained, and for at least one of the sets of data; sorting the set of data into column order; magnifying data derived from the sorting step so as to enhance the resolution of the image; mapping data derived from the magnifying step into further data using a predetermined mapping function so as to enhance the contrast between selected portions of the image; and obtaining the set of control signals by filtering data derived from the mapping step using a band pass function which rejects spatial frequencies below a predetermined first frequency and/or rejects spatial frequencies above a predetermined second frequency so as to minimize, respectively, the effects of variations in the thickness of the target and/or spurious frequencies resulting from the magnifying step.
REFERENCES:
patent: 3483860 (1969-12-01), Namerow
patent: 3599089 (1971-08-01), Bugnolo
patent: 3956695 (1976-05-01), Stamm
patent: 4138998 (1979-02-01), Nowogrodzki
Jacobi John H.
Larsen Lawrence E.
Bellamy Werten F. W.
Gapcynski William G.
Krawczewicz Stanley T.
The United States of America as represented by the Secretary of
Winters Sherman D.
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