Monitoring tag with removal detection

Details Monitoring tag with removal detection Monitoring tag with removal detection

G - Physics

08

B

G08B 13/184 (2006.01) G08B 21/02 (2006.01) G08B 29/04 (2006.01) G08B 29/14 (2006.01)

Patent

CA 2222164

A tag (20) is provided for being secured to an object whose location is to be monitored. Improved mechanisms are provided for ensuring that removal of the tag is detected and signaled to a monitoring system. One preferred embodiment of the tag of the present invention includes an optical sensor (50) for sensing when the tag is near the surface of the object whose location is being monitored. The optical sensor emits optical signals to the surface of the object being monitored and receives reflected optical signals back therefrom. The tag periodically transmits status messages (70) to the monitoring system which permit the monitoring system (22) to determine whether the tag (20) is being held near the object and whether the tag (20) is within the monitored area. In another embodiment of the present invention, a temperature sensor (202) is substituted for the optical sensor.

L'invention porte sur une balise à fixer sur un objet dont il faut surveiller la position ainsi que sur des mécanismes améliorés veillant à ce que la dépose de la balise soit décelée et signalée au dispositif de surveillance. Dans un mode de réalisation préféré de la balise selon l'invention, figure un capteur optique (50) permettant de détecter si la balise se trouve près de la surface de l'objet dont on surveille la position. Ce capteur optique émet des signaux optiques vers la surface de l'objet sous surveillance et en reçoit, en retour, des signaux optiques réfléchis. La balise transmet périodiquement des messages de situation (70) au dispositif de surveillance (22), ce qui lui permet de vérifier si la balise (20) se trouve bien en place près de l'objet et à l'intérieur de la zone surveillée. Dans un autre mode de réalisation, le capteur optique est remplacé par un palpeur de température.

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