Electronic fiber optic seal monitors

Details Electronic fiber optic seal monitors Electronic fiber optic seal monitors

2011-01-18

2011-01-18

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S221000

Reexamination Certificate

active

07872220

ABSTRACT:
The new seal monitor uses of a time dependant pseudo random number or a number from a time pad, which are lists of random numbers often used in encryption. This number changes periodically, for example, once an hour or whatever time interval is deemed timely by the particular application. It is intended that a remote monitoring station would send a request to the monitor and the monitor would respond with the random number that dependant on the time the monitor was started and how much time has elapsed. If the random number returned is correct it infers that the monitor is operating correctly and the seal has not been tampered with. If the monitor does not respond or responds with an incorrect number then the monitor or the seal has been tampered with. Light through a cable is periodically compared with historic outputs from that cable.

REFERENCES:
patent: 4857727 (1989-08-01), Lenz et al.
patent: 7104851 (2006-09-01), Gonring et al.

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