Security system utilizing loosely contained optical fiber

Details Security system utilizing loosely contained optical fiber Security system utilizing loosely contained optical fiber

1992-04-16

1995-05-16

Swarthout, Brent

Communications: electrical

Condition responsive indicating system

Specific condition

340541, 340668, G08B 1318

Patent

active

054164672

ABSTRACT:
A security system, including a cable having a groove formed in the inside thereof to accommodate therein an optical fiber with an excessive length, a plurality of supports having mandrels to support the optical cable so as to provide a fence, a light transmitter to inject light into one end of the optical cable and a light receiver to detect the light projecting out of the other end of the optical cable so that any transmission loss through the optical cable due to an intrusion of the fence may be measured. The cable is formed so that when tension is applied to the optical cable, a transmission loss is detected. The resulting system has a threshold capability which distinguishes valid from false intrusions.

REFERENCES:
patent: 4676485 (1987-06-01), Ciordinik et al.
patent: 4680573 (1987-07-01), Ciordinik et al.
patent: 4701614 (1987-10-01), Jaeger et al.
patent: 4777476 (1986-10-01), Dank
patent: 4829286 (1989-05-01), Zvi

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