Security sensors

Details Security sensors Security sensors

1988-01-05

1989-06-27

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503361, G01J 100

Patent

active

048432440

ABSTRACT:
An intruder sensor contains a microwave detector and a passive infra-red detector in the same housing. A panel in the housing defines a series of Fresnel lens segments which define the zones for the infra-red sensitive element. The panel also forms the radome for the microwave detector. In the twin horn microwave detector, the infra-red sensitive element is mounted on a circuit board between the horns.

REFERENCES:
patent: 4275303 (1981-06-01), Mudge
patent: 4746906 (1988-05-01), Lederer

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