Constant current electronic intruder detection system

Details Constant current electronic intruder detection system Constant current electronic intruder detection system

1981-08-31

1983-08-30

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340524, 340541, G08B 1310

Patent

active

044019807

ABSTRACT:
An electronic detection system for detecting intruders employs a transmisn line as a sensing element. In one embodiment the transmission line is a modified surface-wave transmission line, for example, a Goubau line which is positioned about the perimeter of the area to be protected. An intruder in the field of the line causes an RF reflection back toward the source, which reflection may be detected by Doppler range-gating techniques. In other embodiments of the invention, the transmission line is an insulated, twisted wire pair or a deformable transmission line. In some instances, the transmission line may be replaced with an active or passive pressure line.

REFERENCES:
patent: 949451 (1910-02-01), Seragnoli
patent: 3836899 (1974-09-01), Duvall et al.
patent: 3991413 (1976-11-01), Berger
patent: 4040044 (1977-08-01), Laymon et al.
patent: 4047166 (1977-09-01), Miller et al.
patent: 4075616 (1978-02-01), Rait
patent: 4155083 (1979-05-01), Slaats et al.
patent: 4359721 (1982-11-01), Galvin et al.

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