Security sensors

Details Security sensors Security sensors

1989-03-06

1990-03-27

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, G01J 508, G08B 1318

Patent

active

049123319

ABSTRACT:
A system for locating zones defined by Fresnel lens segments or mirror facets of an optical arrangement in a passive infra-red security sensor uses a prism sheet which deflects light emitted by an LED mounted to the circuit board adjacent the infra-red sensitive detector so that it follows the path of infra-red radiation that would be focused onto the element of the detector without the prism sheet present.

REFERENCES:
patent: 4460829 (1984-07-01), Settani et al.

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