Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1973-08-10
1976-02-24
Britton, Howard W.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 47, 325 67, 325364, 325367, 325370, 340185, 340258D, 343112R, 343112D, 343205, H04B 116
Patent
active
039407004
ABSTRACT:
A method for the detection of a source generating electro-magnetic oscillations wherein for the purpose of eliminating disturbances caused by foreign transmitters there is measured the field intensity at at least two spatially separate locations, the determined measurement values are compared with one another, and when the difference of both measurement values exceeds a value or amount dependent upon the spacing between the measurement locations there is triggered an alarm signal.
The installation for the performance of the aforesaid method comprises a receiver and a first antenna and a second antenna. An antenna reversing switch may be provided for connecting the receiver into circuit with the one or the other antenna. An alternate embodiment provides a second receiver, wherein each antenna is connected with one of the receivers. A comparator serves to compare the signals generated in the receiver or receivers and which signals are dependent upon the fields acting upon the antennae. An evaluation device generates an alarm signal when the difference of the signals determined with the aid of both antennae exceeds a predetermined value.
REFERENCES:
patent: 2490777 (1949-12-01), Bryant et al.
patent: 2519521 (1950-08-01), Weighton
patent: 3097358 (1963-07-01), Zamanakos
patent: 3134104 (1964-05-01), Murphree et al.
patent: 3466652 (1969-09-01), Heyser
patent: 3470481 (1969-09-01), Myers et al.
Bookbinder Marc E.
Britton Howard W.
Haas Paul
Kleeman Werner W.
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