Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1979-06-04
1981-06-02
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
73602, G01R 2704
Patent
active
042713897
ABSTRACT:
A physiologic facsimile image of a biological target without multipath comination is obtained by first producing, for each one of a plurality of sample locations which are spaced so as to define a two-dimensional array, a time delay spectrum wherein the frequency of each spectral ordinate represents the instantaneous differential propagation delay between a first microwave signal which has been propagated through the target and a second microwave signal which initially corresponds to the first microwave signal, and which has been propagated through means having a predetermined propagation delay, and measuring the amplitude of the spectral ordinate corresponding to the direct ray path of propagation through the target, so as to obtain a set of data. The set of data is then digitized and converted from time domain to frequency domain. The transformed data is then processed by sorting the data into column order; magnifying data derived from the sorting step so as to enhance and preserve 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 a set of control signals which are used to actuate a display device to generate the facsimile image 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: 4121468 (1978-10-01), Glover et al.
patent: 4176658 (1979-12-01), Kossoff et al.
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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