Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1972-06-06
1976-07-27
Corcoran, Robert J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 43G, 340258C, 340280, G01R 3300
Patent
active
039719839
ABSTRACT:
A passive ferromagnetic detection station in which the position of the ferromagnetic object carried by a person may be indicated. A plurality of gradiometers mounted at predetermined vertical positions along two vertical members are used to sense any disturbances in the earth's magnetic field. Each gradiometer has a predetermined pattern or area of sensitivity to magnetic fields in which it senses disturbances in the earth's magnetic field. In a preferred embodiment the sensitivity patterns may overlap in predetermined areas. The outputs of the gradiometers are individually processed and converted to digital signals. The digital signals may be used to control a visual display device. In a preferred embodiment, the digital signals may be further processed through digital logic circuitry in order to reduce any false alarms by conditioning any output signal to the display device on the condition that all or a predetermined number of the gradiometers having an overlapping pattern in a particular area sense the ferromagnetic object.
REFERENCES:
patent: 2179240 (1939-11-01), Breitenstein
patent: 2966853 (1961-01-01), Gillfillan, Jr.
patent: 3292080 (1966-12-01), Trikilis
patent: 3423674 (1969-01-01), Goldsmith et al.
patent: 3487459 (1969-12-01), Schonstedt
patent: 3758849 (1973-09-01), Susman et al.
Product Engineering; Doorway Detector Aids Airport Weapons Search; Dec. 1970; p. 43.
Wahl, P., How Science Will Foil The Skyjacker; Pop. Scien., Nov. 1970; pp. 59, 60 and 123.
Corcoran Robert J.
Infinetics, Inc.
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