Infrared intrusion alarm system with temperature responsive...

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

G - Physics

08

B

340/124.4

G08B 13/18 (2006.01) G08B 13/19 (2006.01)

Patent

CA 1120126

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 radi- ation detected rises from the ambient level to a threshold level. A temperature responsive circuit adjusts the thresh- old level so that the system has a relatively uniform de- tection range or sensitivity notwithstanding changes in the ambient temperature in the protected area.

320737

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