Non-contact tamper sensing by electronic means

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Description

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 ... continued below

Physical Description

18 p.

Creation Information

Gritton, D.G. December 31, 1991.

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Description

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.

Physical Description

18 p.

Notes

OSTI as DE94005168

Source

  • Other Information: PBD: 1991

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  • Other: DE94005168
  • Report No.: PATENTS-US--A7799441
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 140448
  • Archival Resource Key: ark:/67531/metadc624289

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • December 31, 1991

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

Description Last Updated

  • Feb. 23, 2016, 3:08 p.m.

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Gritton, D.G. Non-contact tamper sensing by electronic means, patent, December 31, 1991; California. (digital.library.unt.edu/ark:/67531/metadc624289/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.