Intrusion detection apparatus

Details Intrusion detection apparatus Intrusion detection apparatus

1978-02-17

1980-04-08

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

174 99R, 174102R, 174113AS, 324 66, 333241, 340562, 361283, G08B 1310, H01B 1112

Patent

active

041975294

ABSTRACT:
A specially configured cable, which, in use, has a cross section which is mmetrical to a vertical line, but asymmetrical to a horizontal line, is used for an intrusion detection system. It comprises an external sheath, which may be round or rectangular in cross section. An inner conductor is positioned below the center of the cable. It is supported in place by a thin, substantially flat, sheet of insulating material, which is attached to the inner surface of the outer sheath. This particular configuration maximizes the change in capacitance caused by an intruder passing over the cable. The cable is connected to a time-domain reflectometer, which can display on a screen the location of the intrusion with respect to an end of the cable as well as the probable type of intrusion.

REFERENCES:
patent: 3009008 (1961-11-01), Lapsley et al.
patent: 3274329 (1966-09-01), Timmons
patent: 3633194 (1972-06-01), Kothe
patent: 3668625 (1972-06-01), Wolf et al.
patent: 3684816 (1972-08-01), Reighter
patent: 3750126 (1973-07-01), Solomon
patent: 3803548 (1974-04-01), Skujins, Jr.
patent: 3846780 (1974-11-01), Gilcher
patent: 4095040 (1978-06-01), Cookson

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