Infrared intrusion detector with a multi-layer mirror

Details Infrared intrusion detector with a multi-layer mirror Infrared intrusion detector with a multi-layer mirror

1995-10-03

1997-03-04

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250DIG1, 359359, 359360, G02B 1700, G01J 508

Patent

active

056082207

ABSTRACT:
In an infrared intrusion detector, a focusing mirror reflects incident infrared radiation of interest onto a pyroelectric sensor element. To prevent extraneous radiation from reaching the sensor element, the mirror has a reflective layer for reflecting infrared radiation of interest, and an absorptive layer disposed behind the reflective layer for absorbing extraneous radiation which has passed through the reflective layer. Infrared radiation of interest includes human body thermal radiation, and extraneous radiation includes the visible spectrum. Doped indium-tin oxide (ITO) is preferred for the reflective layer.

REFERENCES:
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patent: 4229066 (1980-10-01), Rancourt et al.
patent: 4245217 (1981-01-01), Steinhage
patent: 4321594 (1982-03-01), Galvin et al.
patent: 4792685 (1988-12-01), Yamakawa
patent: 4939359 (1990-07-01), Freeman
patent: 5424718 (1995-06-01), Muller et al.

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