Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1991-11-27
1993-08-17
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
324660, 324661, 324662, 340551, 340568, G08B 1322
Patent
active
052373070
ABSTRACT:
A tamper-sensing system for an electronic tag 10 which is to be fixed to a surface 11 of an article 12, the tamper-sensing system comprising a capacitor having two non-contacting, capacitively-coupled elements 16, 19. Fixing of the body to the article will establish a precise location of the capacitor elements 16 and 19 relative to each other. When interrogated, the tag will generate a tamper-sensing signal having a value which is a function of the amount of capacity of the capacitor elements. The precise relative location of the capacitor elements cannot be duplicated if the tag is removed and affixed to a surrogate article having a fiducial capacitor element 19 fixed thereto. A very small displacement, in the order of 2-10 microns, of the capacitor elements relative to each other if the tag body is removed and fixed to a surrogate article will result in the tamper-sensing signal having a different, and detectable, value when the tag is interrogated.
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Gaither Roger S.
Moser William R.
Swann III Glen R.
The United States of America as represented by the United States
Valdes Miquel A.
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