Tamper detection sensor
First Claim
1. A tamper detection sensor comprising a substrate of an electrically insulating material to one side of which is applied an electrically conductive material, said electrically conductive material including elements electrically isolated from one another, an electrically conductive bridge member interconnecting said elements and being secured to said elements by an electrically conductive adhesive, and a layer of electrically non-conductive adhesive applied to said one side of the substrate to encase said elements and bridge member and by which the sensor can be secured to an item to be protected, the arrangement being such that, on relative movement between the substrate and the layer of non-conductive adhesive, the conductive adhesive is deformed whereby the electrical resistance thereof is altered, said alteration in resistance being utilized to provide an indication of said relative movement.
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Abstract
A tamper detection sensor comprises an insulating substrate (2) to one side of which are applied electrically isolated strips (4) of an electrically conductive material, an electrically conductive bride member (8) interconnecting the strips (4) and secured to the strips (4) by an electrically conductive adhesive (10), and a layer (12) of electrically non-conductive adhesive applied to the one side of the substrate (2) to encase the conductive strips (4) and the bridge member (8) and by which the sensor can be secured to an item (14) to be protected. On relative movement between the substrate (2) and the layer (12) of non-conductive adhesive, the conductive adhesive (10) is deformed whereby the electrical resistance thereof is altered, this alteration in resistance being detected by an electronic monitor (18) connected to the sensor to provide an indication of the relative movement and therefore of tampering with the sensor.
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Citations
10 Claims
- 1. A tamper detection sensor comprising a substrate of an electrically insulating material to one side of which is applied an electrically conductive material, said electrically conductive material including elements electrically isolated from one another, an electrically conductive bridge member interconnecting said elements and being secured to said elements by an electrically conductive adhesive, and a layer of electrically non-conductive adhesive applied to said one side of the substrate to encase said elements and bridge member and by which the sensor can be secured to an item to be protected, the arrangement being such that, on relative movement between the substrate and the layer of non-conductive adhesive, the conductive adhesive is deformed whereby the electrical resistance thereof is altered, said alteration in resistance being utilized to provide an indication of said relative movement.
Specification