G - Physics – 08 – B
Patent
G - Physics
08
B
325/44
G08B 25/00 (2006.01) G08B 1/08 (2006.01) G08B 19/00 (2006.01) G08B 21/00 (2006.01) G08B 29/00 (2006.01) H04B 1/034 (2006.01)
Patent
CA 1299660
Abstract of the Disclosure A tag for use with an individual monitoring system. The tag is worn by an individual being monitored, preferrably on the ankle or leg where it can be concealed by the clothing of the individual. The tag is fully self contained and sealed. The ciruits of the tag periodically generate an identification signal that includes an identification code. The identification signal modulates a stable RF signal that is transmitted in bursts of data words to a receiver associated with a field monitoring device (FMD) located at the monitoring location. In turn, the FMD may randomly establish communication with a central processing unit (CPU) located at a central monitoring location. Other information is included in the identification code of the tag, such as information indicating that an attempt has been made to remove the tag from the individual. The tag is held in place near the skin of it's wearer by a conductive strap that wraps around the leg or other limb of the individual. Two capacitive electrodes, one of which is realized with the conductive strap, function as the plates of a capacitor, with the body flesh serving as the dielectric material therebetween. By monitoring an alternating signal coupled from one capacitive electrode to the other, a determination can be made as to whether the tag has remained near the body flesh. Further, because the strap is conductive, a signal can be passed therethrough and a determination can be made as to whether the strap has been broken.
534612
Pauley James Donald
Ripingill Allen Edward Jr.
B.i. Incorporated
Smart & Biggar
LandOfFree
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