Radiation detection arrangements and methods

Details Radiation detection arrangements and methods Radiation detection arrangements and methods

1989-12-21

1992-02-25

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250349, 340567, G01J 504, G08B 1319

Patent

active

050916483

ABSTRACT:
An intruder detection system employs two infra-red sensors 5,60 within the same housing 4. Both sensors have substantially the same field of view 6 and one 5 of the sensors detects an intruder by sensing the latter's emitted IR. The other sensor 60 detects near-IR. In order to detect against the presence of IR masking material in the field of view (which might be used to mask the presence of an intruder) remote units are provided, each emitting near-IR to sensor 60. The output from the remote units may be coded to distinguish them from the ambient IR. A warning is produced if a mask (such as mask 40) blocks one of the remote units.

REFERENCES:
patent: 4465998 (1984-08-01), Durand
patent: 4709153 (1987-11-01), Schofield

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