Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-10-14
1979-01-16
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
128 2A, G01R 2704
Patent
active
041351312
ABSTRACT:
Remote interrogation of biological targets is accomplished in accordance h the present invention by method and apparatus wherein a microwave signal is generated which varies in frequency from a first frequency to a second frequency in a predetermined time period. The signal is divided into two signals, one of which is propagated through a test channel comprising a transmitting antenna for transmitting the signal through the target, and a receiving antenna for receiving the signal transmitted through the target, and the other of which is propagated through a reference channel providing a fixed time delay of propagation. The propagated signals are detected and mixed to produce a time delay spectrum wherein the frequency of each spectral line represents the instantaneous difference in the frequencies of the detected signals.
REFERENCES:
patent: 3432752 (1969-03-01), Frederickson et al.
patent: 3441843 (1969-04-01), Wainwright
patent: 3445762 (1969-05-01), Wu
patent: 3586969 (1971-06-01), Rudisill, Jr.
patent: 3956695 (1976-05-01), Stamm
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
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