Security enclosures

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G - Physics

08

B

340/125

G08B 13/22 (2006.01) B60R 25/10 (2006.01) G06F 21/00 (2006.01) G08B 13/12 (2006.01)

Patent

CA 1306034

ABSTRACT: A security enclosure is formed from layers of flexible material. One layer carries a flexible semiconductive line arranged to extend over the whole area of the enclosure. Any interruption of the line by unauthorized opening of the enclosure changes the resistance of the line and so can be detected by a monitoring circuit. Further, two layers of semiconductive fibers also cover the whole area of the enclosure and are separated by an insulating layer. The length of the fibers is greater than the thickness of the insulating layer so that if the enclosure is pierced fibers from one layer will be forced into contact with fibers from the other layer. This will change the combined resistance of the layers and this can also be detected by a monitoring circuit. The two measures can be used separately.

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