Fiber optic security system

Details Fiber optic security system Fiber optic security system

1996-05-31

1997-10-21

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340600, G08B 1314

Patent

active

056801041

ABSTRACT:
An optical fiber security system includes an optical emitter connected to one end of an optical fiber and a detector connected to the other end. A random signal generator triggers the emitter to output a light pulse signal through the fiber. This generator also simultaneously triggers the detector to receive the light pulse signal. A comparator compares the light pulse signal that is received by the detector with an optimum reference to adjust and conform the emitter output with the reference. Also, a monitor determines whether a particular identifiable characteristic of the light pulse signal is within a predetermined range of values. Whenever there is not a simultaneous emission and detection of the light pulse signal, or whenever the light pulse characteristic is outside the predetermined range of values, the system alarms.

REFERENCES:
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patent: 3742947 (1973-07-01), Hashem
patent: 3794841 (1974-02-01), Cosentino et al.
patent: 3986498 (1976-10-01), Lewis
patent: 4589404 (1986-05-01), Barath et al.
patent: 4812641 (1989-03-01), Ortiz Jr.
patent: 4870952 (1989-10-01), Martinez
patent: 4878045 (1989-10-01), Tanaka et al.

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