Quad element intrusion detection

Details Quad element intrusion detection Quad element intrusion detection

1989-02-28

1990-10-16

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, G01J 518

Patent

active

049637495

ABSTRACT:
A dual channel intrusion detection system comprising first and second radiation sensors. Each sensor has a pair of elements viewing adjacent zones of the protected area, the zones being slightly offset from each other in the direction of expected intruder movement. Sequence detection is provided for producing an intruder-present signal in response to simultaneous actuation of one element of each sensor when preceded by actuation of the other element of one of the sensors. Additional immunity from false triggering is obtainable if this sequence must be followed by actuation of the other element of the second sensor.

REFERENCES:
patent: Re29082 (1976-12-01), Schwarz
patent: 4614938 (1986-09-01), Weitman
patent: 4618854 (1986-10-01), Miyake et al.
patent: 4697081 (1987-09-01), Baker
patent: 4704533 (1987-11-01), Rose et al.
patent: 4710630 (1987-12-01), Kuppenheimer et al.

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