Elongate body of strip or similar form incorporating...

G - Physics – 08 – B

Patent

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26/197, 88/97, 3

G08B 13/18 (2006.01) G08B 13/12 (2006.01) G08B 13/186 (2006.01)

Patent

CA 1118069

TITLE OF THE INVENTION "Security system and strip or strand incorporating fibre-optic wave-guide means therefor" ABSTRACT OF THE DISCLOSURE To provide 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 fibre-optic wave guide is incorporated in a strand which is formed with barbs or serrations along its edges. The manufacture of a strip or strand incorporating a fibre-optic wave guide and for use in a security system is also disclosed. - 1 -

311818

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