Security system

Details Security system Security system

1991-05-23

1992-09-22

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

25022711, 340506, 340521, 340539, G08B 1318, H01J 516

Patent

active

051501007

ABSTRACT:
A security system for monitoring comprising an optical source for producing optical signals. The security system is also comprised of a detector in optical communication with the optical source which receives the optical signals produced by the optical source. The security system additionally is comprised of an electrical circuit in communication with the optical source and the detector, which is either in a first state or a second state. The circuit controls the optical source and determines whether the optical signal received by the detector is such that the circuit is in the first state or the second state. The circuit also indicates when the optical signal received by the detector is such that a transition from the first state to the second state is imminent to occur. The presence of this imminent transition is otherwise called the pre-alarm condition. In a preferred embodiment, the circuit includes multiple status circuit sensor outputs which inform the local and remote locations about the status of the distinct operating conditions of the circuit.

REFERENCES:
patent: 4342988 (1982-08-01), Thompson et al.
patent: 4468657 (1984-08-01), Rossin
patent: 4764758 (1988-08-01), Skala
patent: 4785295 (1988-11-01), Fukui et al.
patent: 4818970 (1989-04-01), Natale et al.

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