Non-contact tamper sensing by electronic means
This invention is comprised of a tamper-sensing system for an electronic tag which is to be fixed to a surface of an article, the tamper-sensing system comprising a capacitor having two non- contacting, capacitively-coupled elements. Fixing of the body to the article will establish a precise location of the capacitor elements and 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 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.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- Assignee:
- Dept. of Energy
- Patent Number(s):
- PATENTS-US-A7799441
- Application Number:
- ON: DE94005168; PAN: 7-799,441
- OSTI ID:
- 140448
- Resource Relation:
- Other Information: PBD: 1991
- Country of Publication:
- United States
- Language:
- English
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