Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1990-12-24
1992-01-21
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250342, G01J 508
Patent
active
050830252
ABSTRACT:
A passive infrared motion indicator installed at a distance above the ground includes a housing having at least one housing recess formed therein. A Fresnel lens system is disposed in the at least one housing recess. At least one infrared sensor disposed inside the housing has Fresnel lenses onto which frontally arriving first infrared rays with a horizontal main ray are directed from a first detection area and deflected onto the infrared sensor and Fresnel lenses onto which laterally arriving second infrared rays with a horizontal main ray are directed from a second detection area and reflected onto the infrared sensor. At least one deviation mirror surface is tilted above the horizontal main rays of the first and second infrared rays for intermediately deflecting third infrared rays arriving from a third detection area disposed below the passive infrared motion indicator between the ground and the first and second detection areas, onto the infrared sensor.
REFERENCES:
patent: 3958118 (1976-05-01), Schwarz
patent: 4644147 (1987-02-01), Zublin
Asea Brown Boveri Aktiengesellschaft
Greenberg Laurence A.
Hannaher Constantine
Lerner Herbert L.
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