Intruder detector

Details Intruder detector Intruder detector

1985-06-06

1987-11-24

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, G01J 504

Patent

active

047091533

ABSTRACT:
To monitor that infra-red radiation element 22 within housing 10 has not been disarmed, for instance by rendering opaque an infra-red transparent element 16 masking a window 12, in the housing 10, through which radiation may enter and be focussed by optical system 18 onto the element 22, an infra-red radiation generator 32 comprising a low-temperature lamp 34 is mounted externally of the housing 10 so that element 22 receives radiation therefrom and provides a signal to a processor 30. The latter will provide an alarm in the event of absence of radiation from the generator 32 and/or change in the radiation reaching the element 22 commensurate with approach of a person.

REFERENCES:
patent: 4447726 (1984-05-01), Mudge et al.
patent: 4460829 (1984-07-01), Lettanni et al.
patent: 4484075 (1984-11-01), Kahl, Jr. et al.
patent: 4507654 (1985-03-01), Slolarczyk et al.
patent: 4529881 (1985-07-01), Ceurvels et al.
patent: 4605302 (1986-08-01), Lofgren et al.

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