Security system transmission line

Details Security system transmission line Security system transmission line

1985-02-08

1987-12-01

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

342 27, G08B 1326

Patent

active

047107537

ABSTRACT:
The invention relates to a leaky cable intrusion detection system comprising a pair of spaced, parallel, buried, leaky coaxical cables. A radio frequency signal is applied to one of the cables, whereby an electromagnetic field outside said one cable is established, and a radio frequency signal from the field penetrates and is received from the other of the cables whereby disturbances in said field can be detected. The cables are spaced apart a distance such that they are intermediately coupled, being coupled to a greater degree than loosely coupled and to a laser degree than tightly coupled. In the preferred embodiment a longitudinal shield is spaced from and is below the cables. By varying the spacing between the cables and the shield, variations in field shape and sensitivity of the system can be substantially reduced.

REFERENCES:
patent: 3801976 (1974-04-01), Ross et al.
patent: 3896425 (1975-07-01), Erichsen
patent: 4091367 (1978-05-01), Harman
patent: 4375009 (1983-02-01), Fearnside et al.
"Guidar: An Intrusion Detection System for Perimeter Protection", by R. K. Harman 1976 Carnahan Conferences on Crime Counter-Measures, Lexington, KY, pp. 155-159.

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