Optical fiber intrusion location sensor for perimeter protection

Details Optical fiber intrusion location sensor for perimeter protection Optical fiber intrusion location sensor for perimeter protection

1988-09-27

1990-06-05

Eisenzopf, Reinhard J.

Communications: electrical

Condition responsive indicating system

Specific condition

25022714, 340525, G08B 1318

Patent

active

049317717

ABSTRACT:
A Precinct Protection System includes a laser source of light which is applied at the input to a bundle of light transmissive fibers. The fibers are gathered in a cable in loops of varying lengths so that the fibers enter and exit the cable at one and the same end. The cable is placed along a line adjoining or surrounding the precincts to be protected. An intruder traversing the line or protected perimeter will disturb one or more of the fiber optic loops of the cable. The circumstance and locality of the disturbance produced by the intruder are indicated on an analog or digital display.

REFERENCES:
patent: 4297684 (1981-10-01), Butter
patent: 4342907 (1982-08-01), Macedo et al.
patent: 4443700 (1984-04-01), Macedo et al.
patent: 4459477 (1984-07-01), Asawa et al.
patent: 4482890 (1984-11-01), Forbes et al.
patent: 4591709 (1986-05-01), Koechner et al.

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