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

1978-12-08

1981-12-22

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

156176, 156298, 1563031, 340531, 350 9623, G02B 514, G08B 1318

Patent

active

043073867

ABSTRACT:
In a security system in which at least one fibre-optic wave guide, which is carried in a strand, extends along a 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 intensity of the detected light falls below a predetermined threshold, so as to warn when the wave guide is disturbed significantly or cut through.
In order to manufacture the strand, a fibre-optic wave guide is positioned against an elongate carrier and secured to the latter by bonding agent and/or adhesive tape.
A dummy strip, having identical external appearance to the strand but not including a fibre-optic wave guide, can also run along the boundary in question.

REFERENCES:
patent: 3110891 (1963-11-01), Herrick et al.
patent: 3454261 (1969-07-01), Nachazel
patent: 3623057 (1971-11-01), Hedin et al.
patent: 3688298 (1972-08-01), Miller et al.
patent: 3714644 (1973-01-01), Hellstrom
patent: 3825916 (1974-07-01), Steel et al.
patent: 3898639 (1975-08-01), Mucheryan
patent: 3938124 (1976-02-01), Way et al.
patent: 4028081 (1977-06-01), Marcatili
patent: 4029390 (1977-06-01), Chinnock et al.
patent: 4090902 (1978-05-01), Ferrentino et al.
patent: 4144530 (1979-03-01), Redfern
patent: 4147407 (1979-04-01), Eichenbaum et al.
patent: 4207561 (1980-06-01), Steensma

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