Tamper detection circuit and method for use with wearable transm

Details Tamper detection circuit and method for use with wearable transm Tamper detection circuit and method for use with wearable transm

1992-10-16

1994-03-29

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340572, 34082549, 34082554, 379 38, G08B 1900

Patent

active

052988848

ABSTRACT:
A wearable tag for use with an electronic house arrest monitoring (EHAM) system, or equivalent, is held against a limb of its wearer by a lockable strap. The tag includes tamper detection circuitry for detecting any attempt to remove the tag by cutting or breaking the strap, even when such cutting occurs in the presence of an electrolyte. The strap has a conductor imbedded therein that is in electrical contact, through known resistances, with respective terminals on the tag. The tamper detection circuit detects any change in the resistance of the strap. Further, the terminals are made of, or coated with, dissimilar metals, so that should the tag be immersed in an electrolyte, and the strap cut, the resulting galvanic action between the terminals allows the cut strap to be detected.

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