Infrared intrusion alarm system with temperature responsive thre

Details Infrared intrusion alarm system with temperature responsive thre Infrared intrusion alarm system with temperature responsive thre

1978-02-02

1980-03-25

Hix, L. T.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

340567, H01J 3900, H01H 4724

Patent

active

041952340

ABSTRACT:
Intrusion detector of the type in which the presence of an intruder is detected by infrared heat energy emitted by his body. An alarm signal is delivered when the level of radiation detected rises from the ambient level to a threshold level. A temperature responsive circuit adjusts the threshold level and so that the system has a relatively uniform detection range or sensitivity notwithstanding changes in the ambient temperature in the protected area.

REFERENCES:
patent: 3703718 (1972-11-01), Berman
patent: 3792366 (1974-02-01), Jornod
patent: 3928843 (1975-12-01), Sprout et al.
patent: 3988726 (1976-10-01), Reiss et al.
patent: 4052716 (1977-10-01), Mortensen

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