Security system and strip or strand incorporating fibre-optic wa

Details Security system and strip or strand incorporating fibre-optic wa Security system and strip or strand incorporating fibre-optic wa

1978-09-19

1981-06-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350 9623, 340531, 340555, G02B 514

Patent

active

042752949

ABSTRACT:
To provide security against unauthorised crossing of a boundary, at least one fibre-optic wave-guide extends along the boundary. Light is directed into one end of the guide and the light leaving the guide is detected by an optical detector. An indication is given when the optical intensity of the detected light falls below a predetermined threshold, so as to warn when the wave-guide is disturbed significantly or cut through.
The manufacture of a strip or strand incorporating a fibre-optic wave guide and for use in a security system is also disclosed.

REFERENCES:
patent: 3887265 (1975-06-01), Margolis et al.
patent: 3938124 (1976-02-01), Way et al.
patent: 4076382 (1978-02-01), Oestreich
patent: 4089585 (1978-05-01), Slaughter et al.
patent: 4144530 (1979-03-01), Redfern
patent: 4156104 (1979-05-01), Mondello

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