Security system

Details Security system Security system

G - Physics

08

B

88/97, 340/124.4

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

Patent

CA 1128166

TITLE OF THE INVENTION "Security system" ABSTRACT OF THE DISCLOSURE 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. A dummy strip, having identical external appearance to the strand but not including a fibre-optic wave guide, also runs along the boundary in question.

369839

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