Electromagnetic field perimeter detection apparatus

Details Electromagnetic field perimeter detection apparatus Electromagnetic field perimeter detection apparatus

1982-04-05

1985-11-12

Levy, Stewart J.

Communications: electrical

Condition responsive indicating system

Specific condition

340552, 343894, G08B 1324

Patent

active

045531358

ABSTRACT:
Detection apparatus comprising a plurality of elongate transmitting conductors each coupled to a source of electromagnetic energy and arranged for producing an electromagnetic field along the length thereof, at least one receiving conductor arranged alongside the plurality of transmitting conductors for sensing the electromagnetic field produced thereby, and alarm indicating circuitry coupled to the at least one receiving conductor for providing an alarm indication in response to a sensed disturbance of the electromagnetic field, the source of electromagnetic energy for each transmitting conductor comprising an AC voltage source of selected amplitude and phase, the selection of amplitude and phase determining the configuration of the overall electromagnetic field produced by the transmitting conductors, there being a non-zero phase relationship between the voltage sources of at least two of the transmitting conductors.

REFERENCES:
patent: 2971184 (1961-02-01), Pearson et al.
patent: 3047849 (1962-07-01), Hansen
patent: 4027303 (1977-05-01), Neuwirth et al.
patent: 4053877 (1977-10-01), Torlesse et al.
patent: 4091367 (1978-05-01), Harman
patent: 4174518 (1979-11-01), Mongeon
patent: 4346373 (1982-08-01), Hassman
MERADCOM, (U.S. Army Publication), "Report on Sensor Study", Jul. 1, 1977, pp. 368-377.

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